Category Archives: Birmingham

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Birmingham – a center for potato studies

When the late Professor Jack Hawkes (right) was appointed to a lectureship in botany at the University of Birmingham in 1952, he had already been working on potatoes for more than a decade. And immediately prior to arriving in Birmingham he’d spent three years in Colombia helping to establish a national potato breeding program. From then until his retirement in 1982  – and indeed throughout the 1980s – Birmingham was an important center for potato studies.

The potato germplasm that Hawkes collected (with EK Balls and W Gourlay in the 1938-39 expedition to South America) eventually formed the basis of the Empire then Commonwealth Potato Collection, maintained at the James Hutton Institute in Scotland. Throughout the 50s, 60s, 70s, and 80s Jack also had a large collection of wild potato (Solanum) species at Birmingham. This was a special quarantine collection; in the 1980s for potato quarantine purposes, Birmingham was effectively outside the European Union! For more than two decades Jack was assisted by horticultural technician Dave Downing, seen in the photo below. At the end of the 1980s we decided to donate the seed stocks from Jack’s collection to the Commonwealth Potato Collection, and it went into quarantine in Scotland. As the various lines were tested for viruses diseases they were introduced into the main collection.  Jack used this collection to train a succession of PhD students on the biosystematics of potatoes. I continued with this tradition after I joined the University of Birmingham in 1981. My first student graduated in 1982 (after I had taken over supervision from Jack).

Horticultural technician Dave Downing, who worked with the Hawkes collection at Birmingham for more than two decades.

Here is the list of University of Birmingham PhD students who worked on potatoes, as far as I can remember. All of them from 1975 (with the exception of Ian Gubb) had also attended the MSc course on genetic resources:

Richard Lester (UK), 1962. Taught at Makerere University in Uganda, before joining the Dept. of Botany at Birmingham in 1969. Retired in 2002, and died in 2006. Studied the biochemical systematics of Mexican wild Solanum species. The species Solanum lesteri is named after him.

Richard Tarn (UK), 1967. Emigrated to Canada in 1968, and joined Agriculture Canada as a potato breeder in Fredericton, New Brunswick. Retired in 2008. Studied the origin of ploidy levels in wild species.

Katsuo Armando Okada (Argentina), 1970 (?). Retired. Was with IBPGR for a while in the 1980s (?) in Colombia. Studied the origin of Solanum x rechei from Argentina.

Phillip Cribb (UK), 1972. He joined the Royal Botanic Gardens – Kew, and became a renowned orchid taxonomist. Studied the origin of the tetraploid Solanum tuberosum ssp. andigena.

Mike Jackson (UK), 1975. Studied the triploid cultigen Solanum x chaucha. Joint with CIP and Roger Rowe.

David Astley (UK), 1975. Became the curator of the vegetable genebank at Wellesbourne (now the Warwick Crop Centre). Studied the Bolivian wild species Solanum sucrense. The species S. astleyi is named after Dave.

Zosimo Huaman (Peru), 1976. He returned to the International Potato Center (CIP) in Lima, and continued working with the germplasm collection until December 2000; he then began work with several NGOs on biodiversity issues in Peru. Studied the origin of the diploid cultigen Solanum x ajanhuiri. Joint with CIP and Roger Rowe.

Peter Schmiediche (Germany), 1977. He continued working with CIP as a potato breeder (for resistance to bacterial wilt), and was later CIP’s regional leader based in Indonesia. Now retired and sharing his time between Texas (where his children settled) and his native Berlin. Studied the bitter potatoes Solanum x juzepczukii (3x) and S. x curtilobum (5x). Joint with CIP and Roger Rowe.

Luis Lopez (Colombia), 1979. Studied wild species in the Series Conicibaccata.

Lenny Taylor (UK), late 1970s. I don’t remember his thesis topic, but I think it had something to do with tetraploid forms. He joined the Potato Marketing Board (now the Potato Council) but I’ve lost contact.

Lynne Woodwards (UK), 1982. Studied the Mexican tetraploid Solanum hjertingii, which does not show enzymic blackening in cut tubers.

Rene Chavez (Peru), 1984. He returned to the University of Tacna, Peru, but also spent time at CIAT in Cali, Colombia studying a large wild cassava (Manihot spp.) collection. He sadly died of cancer a couple of years ago. Studied wide crossing to transfer resistance to tuber moth and potato cyst nematode. Joint with CIP and Peter Schmiediche.

Elizabeth Newton (UK), 1987? Studied sexually-transmitted viruses in potato. Joint with former CIP virologist Roger Jones (now at the University of Western Australia) at the MAFF Harpenden Laboratory.

Denise Clugston (UK), 1988. Studied embryo rescue and protoplast fusion to use wild species in potato breeding.

Carlos Arbizu (Peru), 1990. An expert on minor Andean tuber crops, he came from the University of Ayacucho. Spent time working in the germplasm program at CIP. Studied the origin and value of resistance to spindle tuber viroid in Solanum acaule. Joint with CIP and principal virologist Luis Salazar (who gained his PhD while studying at the Scottish Crop Research Institute in Dundee).

Ian Gubb (UK), 1991. Studied the biochemical basis of non-blackening in Solanum hjertingii. Joint with the Food Research Institute, Norwich.

Susan Juned (UK), 1994. Now a sustainable technology consultant, Sue is an active local government councillor, and has stood for election to parliament on a couple of occasions for the Liberal Democrats. Studied somaclonal variation in potato cv. Record; this commercial contract research was commissioned by United Biscuits.

David Tay (Malaysia), 2000. He worked in Australia and then was Director of the USDA Ornamental Plant Germplasm Center in Columbus, Ohio, but returned to CIP as head of the genetic resources unit in 2007. He’s now left CIP. I think he worked on diploid cultivated species. Joint with CIP. Not sure why his PhD is dated 2000, as he’d been in CIP in the late 70s.

I also supervised several MSc students who completed dissertations on potatoes (Reiner Freund from Germany, and Beatrice Male-Kayiwa and Nelson Wanyera from Uganda).

The Birmingham link with CIP is rather interesting. In the early 70s, staff at CIP seemed to have a graduate degree in the main from one of four universities: Cornell, North Carolina State, Wisconsin, or Birmingham.

Besides the Birmingham PhD students who went on to work at CIP, my wife Stephanie (MSc 1972, who had been working with the Commonwealth Potato Collection from November 1972 – June 1973 when it was still based at the Scottish Plant Breeding Station – now closed) joined the Breeding and Genetics Dept. at CIP in July 1973.

Roger Rowe, who had been in charge of the US potato genebank in Sturgeon Bay, Wisconsin, also joined CIP in July 1973 as head of the Breeding and Genetics Dept. He co-supervised (with Jack Hawkes) a number of Birmingham PhD students.

With the closure of Jack’s collection at Birmingham we were able to develop other potato research ideas since there were no longer any quarantine restrictions. In 1984 we secured funding from the Overseas Development Administration (now the Department for International Development – DfID) to work on single seed descent (SSD) from diploid potatoes to produce true potato seed (TPS). Diploids are normally self-incompatible, but evidence from a range of species had shown that such incompatibility could be broken and transgressive segregants selected. The work was originally started in collaboration with the Plant Breeding Institute (PBI) in Cambridge, but when the Thatcher government privatized the PBI and sold it to Monsanto in 1988, we continued the work at Birmingham. After a further year we hit a ‘biological brick wall’ and decided that the resources needed would be too great to warrant continued effort. This paper reflects our philosophy on TPS [1]. Another paper [2] spells out the approach we planned.

[1] Jackson, M.T., 1987. Breeding strategies for true potato seed. In: G.J. Jellis & D.E. Richardson (eds.), The Production of New Potato Varieties: Technological Advances. Cambridge University Press, pp. 248-261.

[2] Jackson, M.T., L. Taylor & A.J. Thomson, 1985. Inbreeding and true potato seed production. In: Report of a Planning Conference on Innovative Methods for Propagating Potatoes, held at Lima, Peru, December 10-14, 1984, pp. 169-179.

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Genetic resources – the impact of the University of Birmingham

The University of Birmingham, a major English university, received its royal charter in 1900, although a predecessor medical college was founded in Birmingham in 1825.

Kenneth Mather FRS

Although strong in the various biological sciences – with leading botany, zoology, microbiology, and genetics departments (now combined into a School of Biosciences), Birmingham never had an agriculture faculty. Yet its impact on agriculture worldwide has been significant.

For decades it had one of the strongest genetics departments in the world, with luminaries such as Professor Sir Kenneth Mather FRS* and Professor John Jinks FRS**, leading the way in cytology, and population and quantitative genetics.

John Jinks FRS

In fact, genetics at Birmingham was renowned for its focus on quantitative genetics and applications to plant breeding. For many years it ran a one-year MSc course in Applied Genetics.

The head of the department of botany and Mason Professor of Botany during the 1960s was Jack Heslop-Harrison FRS*** whose research and reviews on genecology would make such valuable contributions to the field of plant genetics resources.

Jack Hawkes

Professor Jack Hawkes OBE succeeded Heslop-Harrison as Mason Professor of Botany in 1967, although he’d been in the department since 1952. Jack was a leading taxonomist of the tuber-bearings Solanums – potatoes! Since 1938 he had made several collecting expeditions to the Americas (often with his Danish colleague JP Hjerting) to collect and study wild potatoes. And it was through his work on potatoes that Jack became involved with the newly-founded plant genetic resources movement under the leadership of Sir Otto Frankel. Jack joined a Panel of Experts at FAO, and through the work of that committee plans were laid at the end of the 1960s to collect and conserve the diversity of crop plants and their wild relatives worldwide, and establish an international network of genebanks.

FAO Panel of Experts, 1960s

The culmination of that initiative – four decades later – was the opening in 2008 of the Svalbard Global Seed Vault.

Jack wondered how a university might contribute effectively to the various genetic resources initiatives, and decided that a one-year training course leading to a masters degree (MSc) would be the best approach. With support from the university, the course on Conservation and Utilization of Plant Genetic Resources took its first intake of four students (from Australia, Brazil, Candada, and the UK) in September 1969. I joined the course in September 1970, alongside Ayla Sencer from Izmir, Turkey, Altaf Rao from Pakistan, Folu Dania Ogbe from Nigeria, and Felix Taborda-Romero from Venezuela. Jack invited many of the people he worked with worldwide in genetic resources to come to Birmingham to give guest lectures. And we were treated to several sessions with the likes of Dr Erna Bennett from FAO and Professor Jack Harlan from the University of Illinois.

From the outset, Frankel thought within 20 years everyone who needed training would have passed through the course. He was mistaken by about 20 years. The course remained the only formal training course of its kind in the world, and by 2008 had trained over 1400 MSc and 3-month short course students from more than 100 countries, many becoming genetic conservation leaders in their own countries. Although the course, as such, is no longer offered, the School of Biosciences still offers PhD opportunities related to the conservation, evaluation and use of genetic resources.

The first external examiner (for the first three years) was Professor Hugh Bunting, Professor of Agricultural Botany at the University of Reading. Other examiners over the years have included Professor Eric Roberts (Reading) and Professor John Cooper FRS (Aberystwyth) and directors of Kew, Professor Sir Arthur Bell and Professor Sir Peter Crane FRS. Students were also able to carry out their dissertation research over the years at other institutions, such as Kew-Wakehurst Place (home of the Millennium Seed Bank) and the Genetic Resources Unit, Warwick Crop Centre (formerly the National Vegetable Genebank at Wellesbourne) where the manager for many years was Dr Dave Astley, a Birmingham graduate from the 1971 intake.

And what has been the impact of training so many people? Most students returned to their countries and began work in research – collecting and conserving. In 1996, FAO presented a report, The State of the World’s Plant Genetic Resources, to the Fourth International Technical Conference on Plant Genetic Resources held in Leipzig, Germany, in June 1996, and published in 1998. Many Birmingham graduates attended that conference as members of national delegations, and some even headed their delegations. In the photo below, everyone is a Birmingham graduate, with the exception of Dr Geoff Hawtin, Director General (fourth from the right, at the back) and Dr Lyndsey Withers, Tissue Culture Specialist (seventh from the right, front row) from IPGRI (now Bioversity International) that provided scholarships to students from developing countries, and guest lectures. Two other delegates, Raul Castillo (Ecuador) and Zofia Bulinska-Radomska (Poland), are not in the photo, since they were occupied in delicate negotiations at the time.

Birmingham graduates and affiliate staff at the FAO conference in Leipzig, June 1996

Dr J Trevor Williams (r). Behind him is Professor Jim Callow, Mason Professor of Botany. Behind Jim Callow is Jack Hawkes, and to his right (behind the tree) is Brian Ford-Lloyd. I am second from the left.

In 1969, two new members of staff were recruited to support the new MSc course. Dr J Trevor Williams (shown on the right in this photo taken at the 20th anniversary meeting at Birmingham in November 1989) acted as the course tutor, and lectured about plant variation.

Dr Richard Lester (who died in 2006) was a chemotaxonomist and Solanaceae expert. Trevor left Birmingham at the end of the 70s to become Executive Secretary, then Director General of the International Board for Plant Genetic Resources (which in turn became IPGRI, then Bioversity International).

Brian Ford-Lloyd (right, now Professor of Conservation Genetics and Director of the university Graduate School) joined the department in 1979 and was the course tutor for many years, and contributing lectures in data management, among others.

With the pending retirement of Jack Hawkes in September 1982, I was appointed in April 1981 as a lecturer to teach evolution of crop plants, agroecology, and germplasm collecting among others, and to supervise dissertation research. I eventually supervised more than 25 MSc students in 10 years, some of whom continued for a PhD under my supervision (Susan Juned, Denise Clugston, Ghani Yunus, Javier Francisco-Ortega) as well as former students from Peru (René Chavez and Carlos Arbizú) who completed their PhD on potatoes working at CIP while registered at Birmingham. I was also the short course tutor for most of that decade.

IBPGR provided funding not only for students, but supported the appointment of a seed physiologist, Dr Pauline Mumford until 1990. This was my first group of students who commenced their studies in September 1981. Standing are (l to r): Reiner Freund (Germany), Pauline Mumford, and two students from Bangladesh. Seated (l to r) are: Ghani Yunus (Malaysia), student from Brazil, Ayfer Tan (Turkey), Margarida Texeira (Portugal), student from Indonesia. Missing from that photo is Yen-Yuk Lo from Malaysia.

MSc students from Malaysia, Germany, Uruguay, Turkey, Portugal, Indonesia and Bangladesh. Dr Pauline Mumford, seed physiologist, stands in the second row.

The course celebrated its 20th anniversary in November 1989, and a group of ex-students were invited to Birmingham for a special workshop, sponsored by IBPGR. In the photo below are (l to r): Elizabeth Acheampong (Ghana), Indonesia, Trevor Williams, Yugoslavia, Zofia Bulinska-Radomska (Poland), India, Carlos Arbizu (Peru), Philippines, ??, Andrea Clausen (Argentina), Songkran Chitrakon (Thailand), ??.

Trevor Williams and former students at Birmingham in 1989 on the 20th anniversary of the MSc course

We also planted a medlar tree (Mespilus germanica); this photo was taken at the tree planting, and shows staff, past and current students.

Medlar planting to commemorate the 20th anniversary of the MSc course

After I resigned from the university to join IRRI in 1991, Dr Nigel Maxted (right) was appointed as a lecturer, and has continued his work on wild relatives of crop plants and in situ conservation. He has also taken students on field courses to the Mediterranean several times.

I was privileged to attend Birmingham as a graduate student (I went on to complete a PhD under Jack Hawkes’ supervision) and become a member of the faculty. The University of Birmingham has made a very significant contribution to the conservation and use of plant genetic resources around the world.

Graduation December 1975

Today, hundreds of Birmingham graduates are involved daily in genetic conservation or helping to establish policy concerning access to and use of genetic resources around the world. Their work has ensured the survival of agrobiodiversity and its use to increase the productivity of crops upon which the world’s population depends.

* Mather was Vice Chancellor (= CEO) of the University of Southampton when I was an undergraduate there from 1967-1970. After retirement from Southampton, Mather returned to Birmingham and had an office in the Department of Genetics. In the late 1980s when I was teaching at Birmingham, and a member of the Genetics Group, I moved my office close-by Mather’s office, and we would frequently meet to discuss issues relating to genetic resources conservation and use. He often told me that a lot of what I mentioned was new to him – especially the genepool concept of Harlan and de Wet, which had been the basis of a Genetics Group seminar by one of my PhD students, Ghani Yunus from Malaysia, who was working on Lathyrus sativus, the grasspea. Mather and I agreed to meet a few days later, but unfortunately we never met since he died of a heart attack in the interim.

** John Jinks was head of department when Nobel Laureate Sir Paul Nurse applied to the university in 1967. Without a foreign language qualification it looked like he would not be offered a place. Until Jinks intervened. Paul Nurse often states that had it not been for John Jinks, he would not have made it to university. Jinks was the head of the Agricultural Research Council when he died in 1987. He was chair of the interview panel when I was appointed to a lectureship in plant biology at Birmingham in April 1981.

*** Heslop-Harrison became Director of the Royal Botanic Gardens, Kew, 1970-1976.

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The agricultural terraces of Cuyo Cuyo, southern Peru

In early 1974 I travelled to southern Peru with a taxonomist friend from the University of St Andrews, Dr Peter Gibbs (right).

Peter and I had become friends when he visited the International Potato Center (CIP) in 1973. At that time Peter was supervising the Master’s thesis of a Peruvian student, Martha Vargas (daughter of renowned Peruvian botanist Professor César Vargas from Cuzco). At CIP he wanted to see if he could hitch a ride to the south of Peru on any germplasm collecting trips planned to that region, so that he could make some collections of oca (Oxalis tuberosa), a minor Andean tuber crop.

Oca tubers

As it happened, I was looking to carry out some ethnobotanical studies on the different potato varieties grown by farmers as part of my PhD research – but where would be a good site?

Peter showed me an old scientific paper (from 1951) by WH Hodge from the University of Massachusetts [1] about the cultivation of different tuber crops, including potatoes and oca, in the village of Cuyo Cuyo, located about 140 km northeast of Puno (69˚50’W, 14˚50’S) at the head of the Sandia Gorge. Well, this seemed like too good an opportunity to miss, and we agreed to pool our resources for the trip.

The drive south in a small Land Rover – down the coastal desert Panamericana highway, across the Nasca plain, climbing to Arequipa, and even higher to Puno – took three days. After resting up in Puno (next to Lake Titicaca), and getting used to the 3827 m altitude, we set off for Cuyo Cuyo. Dropping down from the altiplano at well over 4000 m, Cuyo Cuyo lies at an altitude of about 3300 m. Below the village the valley drops quickly towards the ceja de la montaña – literally ‘eyebrow of the mountain’ – where the humid air of the rainforests below rises up east-facing valleys to form cloud forest.

No-one in Cuyo Cuyo was expecting us, so there were quite a few surprised faces when these two gringos drove into town. Cuyo Cuyo was not on the ‘research-tourist’ trail in 1974, but many researchers have visited Cuyo Cuyo since I was there (see below), and there are quite a few publications now about the socio-economic systems and agriculture there.

Peru 110

Under these circumstances (as on other germplasm collecting trips) I’d found it useful to find the local mayor (alcalde) or schoolteacher and explain what we were up to and have them in turn explain to the local farmers and their families (in Quechua). On a previous trip to the north of Peru in May 1973, a local schoolteacher (rather drunk at the time as we’d arrived on his village’s fiesta) hailed me as a representative of La Reina Isabel (HM The Queen), promptly calling a village meeting, and asked me to give a ‘loyal address’. At that time I had fairly rudimentary Spanish, but it didn’t matter. After a few words of congratulations for the fiesta, every person in the hall (maybe 200 or so) came and shook me by the hand!

Peter and I set up camp, so-to-speak, in the local post office where we could sleep, brew the odd cup of tea (there was a small café in the village where we could eat), and gather our specimens together, including a rudimentary drier for the extensive set of oca herbarium samples that Peter intended to make. But more of that particular story later.

The sides of the Cuyo Cuyo valley are covered with the most wonderful system of agricultural terraces, called andenes, which must have been constructed centuries ago, in Inca times, and have been cultivated ever since. Farmers have different terraces dotted around the valley, and when I was there, at least, farmers were still using a communal rotation system. Thus in one part of the valley the terraces were covered in potatoes (year 1 after a fallow), and oca (years 2 and 3), barley or beans (year 4), or fallow (years 5-8) elsewhere. Sheep are corralled on a terrace prior to planting potatoes, and their urine and dung used as fertilizer. Whether, almost 40 years later, this remains the case I do not know.

But this system of potato and oca cultivation allowed me to make some detailed studies of the diversity of potato fields in terms of varieties grown and their genetic make-up (chromosome number). I eventually published this work in Euphytica in 1980 [2]. And there’s a story about that publication that’s also worth repeating, a little later on.

Since the terraces are quite small, only the native foot plough is used to till the soil (see my earlier post about potatoes). I discovered that different varieties were apparently suited to the growing conditions in different parts of the valley. The most highly prized varieties with a high dry matter content, termed harinosa or floury, were grown on the upper terraces where there was little chance of flooding. Whereas on the valley floor, which was flooded from time-to-time, farmers grew varieties which tended to be more ‘watery’ and used preferentially in soups.

Another very interesting discovery, for me at least, was seeing freshly harvested potatoes dipped in a clay paste after cooking. This practice, known generally as geophagy, has been reported from many societies, as well as observed in animals and birds.

Farmers told me that freshly harvested potatoes (but not the so-called bitter potatoes – see below) tended to be somewhat ‘peppery’ (that’s the best word I can find to describe the sharp taste of some varieties), and that dipping the tubers in the clay paste helped not only with digestion but also reduced the sharpness of the taste. One of the farmers showed me the site where they collected lumps of clay that were then ground to a fine powder and mixed with water. What’s interesting, however, is that I did not find any frost tolerant, bitter potatoes (Solanum juzepczukii or Solanum curtilobum) that have to be processed to make chuño before they can be eaten.

After two or three days, Peter and I felt that we’d done sufficient field work there, and headed north towards Cuzco to visit some additional sites. From there we returned to Lima by air, leaving the Land Rover behind for a CIP colleague.

But what about all those oca herbarium specimens? Despite our best efforts, we had great difficulty in drying the specimens that Peter collected, for two reasons. It was quite wet during our visit to Cuyo Cuyo, and all the samples were covered in moisture even before we attempted to turn them into dried herbarium sheets. Furthermore, oca has rather fleshy stems that just wouldn’t dry. Even after a couple more weeks of drying in Lima, Peter packed up what he had and posted them to St Andrews. After he arrived home, he found that his herbarium specimens were not only alive, but had begun to sprout – so he promptly planted them all in his university glasshouse, and had a range of living samples to use in his study of pollination mechanisms!

And what about the ethnobotany paper that I referred to earlier? I completed my PhD in 1975, and began to write-up my work for publication in scientific journals. I chose the Wageningen-based journal Euphytica for two papers submitted in 1977 on triploid potatoes and crossability studies, and Economic Botany for the Cuyo Cuyo paper. Well, that paper was finally accepted by mid-1977, and I waited for it to appear in print (by that time I’d already moved to Costa Rica and was busy with other potato research).

I didn’t hear anything for many months, but then, out of the blue, I received a letter from the new Editor-in-Chief of Economic Botany asking me if I’d published the paper elsewhere. In taking over the helm at Economic Botany, he’d found manuscripts in the files that had been accepted for publication up to two decades earlier, but had never been published! Well, at about the same time, the Editor of Euphytica, Prof. Anton Zeven, wrote to me, commenting on my PhD thesis (he’d obtained a copy through interlibrary loan) and wondering if I had published my Cuyo Cuyo research. And if I hadn’t, would I seriously consider doing so. What an invitation! With some revisions (but unfortunately removal of some of the more anthropological aspects) I submitted the paper to Euphytica in early 1979, and it was published some months later in 1980.

Cuyo Cuyo in 2006
Among the researchers to have visited Cuyo Cuyo more recently than me – in early 1997 and May 2006 – is University of Wisconsin-Madison associate professor of botany Dr Eve Emshwiller, who has been studying oca for many years now. In a recent message (15 March 2014)  she commented that Cuyo Cuyo was a fascinating place, but changing fast. I’m sure that’s something that could be said about many of the places I visited in the 1970s, then quite remote, but now opened up through better roads and telecommunications. Eve has kindly given me permission to include here some of her wonderful photos taken in 2006 of the oca harvest in Cuyo Cuyo. In one of the photos you can see the patchwork of fields, some with oca, others with potatoes. That cropping system certainly hadn’t changed in more than 30 years.

[1] Hodge, WH, 1951. Three native tuber foods of the high Andes. Economic Botany 5 (No. 2): 185-201.

[2] Jackson, MT, JG Hawkes and PR Rowe, 1980. An ethnobotanical field study of primitive potato varieties in Peru. Euphytica 29: 107-113. Click to read the paper in full.

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Standing on Vavilov’s shoulders . . .

Nikolai Ivanovich Vavilov (1887-1943). Not a name familiar to many people. Vavilov is, however, one of my scientific heroes.

Until I began graduate school in September 1970, when I joined the MSc course at the University of Birmingham on Conservation and Utilization of Plant Genetic Resources, I’d never even heard of him. In fact, looking back, I’m rather surprised that his name didn’t crop up once during my undergraduate years. I’d been encouraged to apply for a place on the Birmingham course by a lecturer in genetics at Southampton University, Dr Joe Smartt. But Vavilov and his work was not on the curriculum of botany courses that I took.

In preparation for Birmingham, I’d been advised to purchase and absorb a book that was published earlier that year, edited by Sir Otto Frankel and Erna Bennett [1] on genetic resources, and dedicated to NI Vavilov. And I came across Vavilov’s name for the first time in the first line of the Preface written by Frankel, and in the first chapter on Genetic resources by Frankel and Bennett. I should state that this was at the beginning of the genetic resources movement, a term coined by Frankel and Bennett at the end of the 60s when they had mobilized efforts to collect and conserve the wealth of diversity of crop varieties (and their wild relatives) – often referred to as landraces – grown all around the world, but were in danger of being lost as newly-bred varieties were adopted by farmers. The so-called Green Revolution had begun to accelerate the replacement of the landrace varieties, particularly among cereals like wheat and rice.

Thus began my fascination with Vavilov’s work, and a career in genetic resources in a broad sense that was to last 40 years until my retirement in 2010.

Vavilov was a botanist, geneticist and plant breeder who rose to the top of agricultural research in the Soviet Union who, through his many expeditions around the world (described in the book Five Continents [2], published posthumously in English in 1997) assembled a vast array of diversity in many crop species. Vavilov developed two seminal theories of crop evolution, which have influenced the science of genetic resources ever since.

The first was his Centers of Diversity and Origin, in which he stated that “the place of origin of a species of a cultivated plant is to be found in the area which contains the largest number of genetic varieties of this plant.” While we now appreciate that this was an oversimplification, his ideas about the origin of crop diversity have been the foundation for much of the genetic resources exploration carried out in subsequent decades.

The second was his Law of Homologous Series in the Case of Variation, published in Russian in 1920 and in English in 1922. I applied this concept in my search for pest resistance in wild potatoes, which I presented at a Symposium organized by the Linnean Society of London and the Institute of Archaeology, University College, London in 1987 to celebrate the centenary of Vavilov’s birth [3].

Vavilov died of starvation in prison at the relatively young age of 55, following persecution under Stalin through the shenanigans of the charlatan Trofim Lysenko. Lysenko’s legacy also included the rejection of Mendelian genetics in the Soviet Union for many years. Eventually Vavilov was rehabilitated, long after his death, and he was commemorated on postage stamps at the time of his centennial.

Although never having the privilege of knowing Vavilov, I do feel that I met him vicariously through three people I have known, who did meet him, and I worked with two of these for many years.

First, Sir Otto Frankel FRS (left), who I first met at a genetic resources meeting in Jakarta in the mid-80s, was an eminent wheat breeder and geneticist, and one of the founders of the genetic resources movement. Originally from Austria, he had escaped before the Nazis came to power, and moved to New Zealand and Australia afterwards. Frankel visited Vavilov in Leningrad (now St Petersburg again) in 1935.

Professor Jack Hawkes (right),  Mason Professor of Botany at the University of Birmingham and my PhD supervisor, travelled to Leningrad in 1938 to consult with Vavilov’s colleague, SM Bukasov, about the potatoes he had collected in South America. He wrote about his meeting with Vavilov, which he presented at the Vavilov Symposium referred to above [4].

Dr John S Niederhauser (left) was an eminent plant pathologist who spent many years researching the potato late blight fungus in Mexico. He was awarded the World Food Prize in 1990. I worked for several years with John in the 1970s when I was regional leader for the International Potato Center in Costa Rica, and we were developing and implementing what turned out to be the first consortium, PRECODEPA (Cooperative Regional Potato Program – in four Central American countries, Mexico and the Dominican Republic), of the Consultative Group on International Agricultural Research (CGIAR). As a young man of about 17, so John told me, he’d asked a travel agent how far he would be able to travel (return) from San Francisco with the money he had available: Leningrad was the destination. Walking around a research garden there one day, he was approached by a kindly gentleman – Vavilov as it turned out – who offered him the chance to work for a few weeks harvesting germplasm evaluation trials on one of his institute’s research stations in the Soviet southeast.

What all three emphasised – in their writings or related to me personally – was Vavilov’s friendliness, generosity of spirit, his boundless energy, and above all, his humanity, and that he treated everyone as an equal, even young persons as Hawkes and Niederhauser were when they met him.

Vavilov’s legacy endures. He is recognized as one of the giants of 20th century biology. And he has been an inspiration for countless students of genetic resources conservation and use.

[1] Frankel, OH & E Bennett (eds), 1970. Genetic Resources in Plants – their Exploration and Conservation. IBP Handbook No 11. International Biological Programme, London and Blackwell Scientific Publications, Oxford and Edinburgh. pp. 554. SBN 632 05730 0.

[2] Vavilov, NI, 1997. Five Continents. International Plant Genetic Resources Institute, Rome, Italy. pp. 198. ISBN 92-9043-302-7.

[3] Jackson, MT, 1990. Vavilov’s Law of Homologous Series – is it relevant to potatoes? Biological Journal of the Linnean Society 39, 17-25.

[4] Hawkes, JG, 1990. NI Vavilov – the man and his work. Biological Journal of the Linnean Society 39, 3-6.

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Dumbing down science . . . only in The Sun

A sweet crisp
During the late 1980s, when I was on the faculty of the University of Birmingham, my colleague, Brian Ford-Lloyd (now Emeritus Professor of Conservation Genetics) and I had a research grant from United Biscuits to work on somaclonal variation in potatoes. Whatever is that? I hear you cry. Well, it’s technique to grow plants from small pieces of plant tissue on sterile nutrient agar (a jelly-like substance), and try and bring about genetic changes which are primarily due to disorganized tissue growth and chromosome changes. The plants thus produced are called somaclones. And our aim was to produce a somaclonal variant of the potato variety Record, which was at that time, one of the most important varieties for producing potato crisps (chips in American parlance).

Potato crisps – just as we like them!

Now, the main crop of potatoes is harvested in the autumn in the UK, and they are stored at low temperature over many months while stocks last. But this leads to a problem that is significant for producing good crisps. And that is, low temperature sweetening that is due to the conversion of starch to sugars, such as glucose and fructose. In itself this would not be a particular problem, but when potato slices are deep fried to produce crisps, any that have a relatively high sugar content will caramelize and the crisps themselves will be much darker in colour – even some ‘black bits (although some of these are due to use of diseased potatoes) – which the consumer does not like. The ideal potato crisp should be a light golden colour.

Anyway, our aim was to try and produce a non-sweetening variant of Record. I left Birmingham before the project was completed, but by that time we had sent a number of clones for field testing. I don’t know if any of these ever went into commercial production.

Dr Susan Juned

Susan Juned joined the project as a research associate, and successfully went on to complete a PhD based on this work. Since leaving Birmingham, Susan has had a distinguished career in local politics, as a Liberal Democrat councillor for Stratford-on-Avon and Warwickshire County Council. She unsuccessfully contested three parliamentary elections for the Stratford constituency.

Publish and be damned
Since the research was funded by a commercial company, we had to seek approval before we were permitted to publish any of our work. But after a couple of years, everyone agreed that a small story in the university bulletin would be appropriate (in November 1987)  and that’s when some of our headaches began, although in hindsight rather humorous. The story was picked up in the local media, and one afternoon I received a phone call from someone at the BBC asking if I’d like to appear on the breakfast show on national TV the following morning to discuss our work. The editorial assistant wanted some more details, and when it became apparent to her that I was talking about a serious piece of research – and not a wind-up about ‘black crisps’, the BBC dropped the story like the proverbial hot potato.

But it was picked up by the tabloid newspaper, The Sun, one of Murdoch’s publications, notorious for its Page Three girl, always half naked! And that’s where our story was published – just check out the tiny item at the bottom of the page (Crunch time for boffins) right next to Suzanne, who’s apparently ‘a bite of alright‘!

A proper scientific outcome
But the research did have some implications for the tissue culture of plants like potatoes that are produced vegetatively through tubers, and also for their genetic conservation in vitro. We showed that the ability to produce somaclones was not the same in all of the cv. Record tubers we started the research project with, and that the whole process of multiplication of disease-free stocks might be leading to a certain level of genetic change and selection. We published this work in the Annals of Botany [1].

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[1] Juned, S.A., M.T. Jackson & B.V. Ford-Lloyd, 1991. Genetic variation in potato cv. Record: evidence from in vitro “regeneration ability”. Annals of Botany 67, 199-203.

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Jack Hawkes – a plant genetic resources pioneer

Jack Hawkes

I was privileged to have known Jack Hawkes for almost 40 years. I first met him in February 1970 when he interviewed me for a place on the recently-established MSc course at the University of Birmingham on the conservation and use of plant genetic resources. I then went on to complete a PhD on potatoes under his co-supervision (with Dr Roger Rowe at the International Potato Center, in Lima, Peru). Since Jack was due to retire from the university in September 1982, I was appointed to a lectureship in plant biology in April 1981 to take on Jack’s teaching commitments on crop evolution and other genetic resources topics.

The post below is based on an article I wrote for the Oxford Dictionary of National Biography, published last year.

John Gregory ‘Jack’  Hawkes – botanist, educator, and visionary – was born in Bristol in 1915. After completing his secondary education at Cheltenham Grammar School in 1934, he won a place at Christ’s College, University of Cambridge, graduating with a BA (Natural Sciences, first class honours) in 1937. His MA was awarded in 1938, and he completed his PhD in 1941 under the supervision of the noted potato breeder and historian, Dr Redcliffe N Salaman FRS. The university awarded Jack the ScD degree in 1957.

On 20 December 1941 Jack married Barbara Ellen Leather. They had two daughters, born in 1944 and 1946, and twin sons born in Colombia in 1950.

On graduation in 1937 Jack successfully applied for the position of assistant to Dr PS Hudson, Director of the Imperial Bureau of Plant Breeding and Genetics in Cambridge, for an expedition to Lake Titicaca in the South American Andes. In the event this expedition did not materialize due to Hudson’s poor health, but a more comprehensive expedition was then planned for 1939, led by EK Balls, a professional plant collector. Thus began Jack’s lifelong interest in ‘the humble spud’.

In order to prepare himself for the expedition, and because Jack himself recognized that he ‘knew virtually nothing about the scientific aspects of potato species’, he received permission to travel to Leningrad to meet Russian scientists SM Bukasov and SW Juzepczuk who had already collected potatoes in South America, and to seek their advice about the planned British expedition.

Nikolai Vavilov

And it was during this visit that Jack met the world-famous geneticist NI Vavilov, who he described as ‘a colossus among his colleagues both within and outside the USSR….’. He acknowledged that it had been ‘a privilege to have known him’, and was certain that Vavilov’s influence helped to shape his career. The authorities in Leningrad even attempted to recruit Jack, perhaps half-heartedly, as a Soviet spy – a suggestion that horrified him and which he hastily rejected.

On a later visit he also met the controversial Trofim Lysenko whose influence with Stalin led to the banning of Mendelian genetics in the Soviet Union for a generation. Jack did not like Lysenko one little bit and thought him ‘a dangerous and wholly repellent person… a politician rather than a scientist’. Lysenko’s ascendancy under Stalin led to Vavilov’s disgrace and early death in 1943.

CCI05022012_00001The 1939 expedition was the first of more than a dozen that Jack made to South and North America in search of wild potato species, and became the basis of his taxonomic treatment of potatoes, first published in 1956, with several later revisions. He had a long collaboration with Danish botanist J Peter Hjerting. Together they published two major monographs on the wild potatoes of Argentina, Brazil, Paraguay and Uruguay (1969) and Bolivia (1989) emphasizing not only the taxonomy but also breeding relationships to facilitate use in potato improvement.

Jack was seconded for three years (1948-1951) by the Colombian government to establish a potato research station. Dr Nelson Estrada, a renowned Colombian potato breeder, was one of Jack’s protégés, and their hybridization research became a model for potato breeding programs.

Nelson Estrada and Jack Hawkes evaluating potato hybrids in the field

Not long after returning to the UK, Jack was appointed lecturer in botany at the University of Birmingham in 1952, and he remained there until his retirement in 1982. In 1961 he received a personal Chair in Taxonomic Botany, and in 1967 was appointed Mason Professor of Botany and head of department. Jack actively supported the genetic resources program at the International Potato Center (CIP) in Lima, Peru from 1973, and several of his PhD students did their thesis research there. He also acted as scientific adviser to the Commonwealth Potato Collection in Scotland (founded from germplasm he collected in 1939) and the USDA potato collection at Sturgeon Bay, Wisconsin.

Jack Hawkes (center) with Frank Haynes (NCSU) on his right and Roger Rowe (USDA) and Don Ugent (Southern Illinois University-Carbondale) looking at CIP’s germplasm collection in Huancayo, January 1973. Ing. Agr. David Baumann (CIP) is explaining how the collection is maintained.

In addition to his lifelong research on potatoes, Jack also spearheaded scientific interest in the Solanaceae plant family that also includes tomato, tobacco, chili peppers, and eggplant, and many species with pharmaceutical properties. With colleagues at Birmingham in the late 1950s he developed serological methods to study relationships between potato species. He was also one of the leading lights to produce a computer-mapped Flora of Warwickshire, a first of its kind, published in 1971.

One of Jack’s most important legacies, stemming from his knowledge of potatoes, was his participation in and contributions to the nascent genetic resources conservation movement of the 1960s. Led by eminent Australian wheat breeder, Sir Otto Frankel FRS, Jack joined the FAO Panel of Experts that included plant collector Erna Bennett and Illinois professor and cereals expert Jack Harlan, among others.

They envisioned a world-wide effort to conserve plant genetic resources in a network of genebanks, and gave impetus to international efforts to collect and conserve plant varieties that were threatened with extinction. These efforts led eventually to the establishment of the International Board for Plant Genetic Resources (IBPGR, now Bioversity International) in Rome, Italy under the auspices of the FAO.

Shortly after being appointed Mason Professor of Botany, Jack received support from the university to develop an international 1-year training course in plant genetic resources. In September 1969 five students enrolled on this MSc course that was subsequently offered for almost four decades – significantly longer than Frankel had predicted when Jack first mooted the idea. The course remained the only formal training course of its kind in the world, and by 2008 had trained over 1400 MSc and 3-month short course students from more than 100 countries, many becoming genetic conservation leaders in their own countries. The training continues at Birmingham, but in a different format.

Jack received many honors and awards, including the 1973 Frank N Meyer Memorial Award from the American Genetic Association for services to plant introduction, and the 1996 Distinguished Economic Botanist Award from The Society for Economic Botany. In 1984 he received the Linnean Medal from the Linnean Society of London, of which he was later elected president (1991-1994), a role that gave him immense pleasure*. He received an OBE for services to botany in 1994. He was awarded the Congress Medal of the XII International Botanical Congress held in Leningrad in 1975, of which he was a Vice President. In 1989 the Potato Association of America elected Jack as an Honorary Life Member. But what probably gave him most pleasure was the Vavilov Medal and the Honorary Professorship from the NI Vavilov Institute of Plant Industry, awarded only twice, and Jack the only non-Russian. In a sense, his life’s work had come full circle from the moment in 1938 when, as a young man of 23, he met the great geneticist at the institute that now bears his name.

L, from top: the Frank N Meyer Memorial Medal; the Linnean Medal; the Vavilov Medal; and on the R: the OBE insignia

Following retirement from the university Jack continued to actively publish until 2004 when his memories of the 1939 expedition – and his initiation into the world of the potato – were published under the title Hunting the Wild Potato in the South American Andes.

A website featuring the 16 mm films (and photo albums) that Jack made during the 1939 expedition, and other expeditions to the USA, Mexico and Central America in 1958 and to Bolivia in 1971 can be viewed here.

After Barbara died in 2005, and increasingly frail, Jack left his home of more than 50 years in Harborne, Birmingham and moved to Reading to be near family. And there he died in September 2007, aged 92.

* A meeting, The Future of Plant Genetic Resources, was held in Jack’s honour at The Linnean Society in May 2009.