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The holy grail of potatoes

02 January 2025 | Story Gerda-Marie van Rooyen | Photo Supplied

Scientists are actively pursuing the successful breeding of diploid hybrid potatoes from inbred lines. This is expected to revolutionise potato breeding as it holds the key to rapid genetic progress. It will introduce new varieties for commercialisation through seed. Currently, existing potato variants have a gene that renders self-pollinated seeds infertile.

Prof Linus Franke, an academic in the Department of Soil, Crop and Climate Sciences at the UFS, is leading the research in South Africa. “This technology allows the production of genetically uniform potato seed that is easy to transport and largely disease-free.” He says this differs from conventional breeding whereby only vegetative propagation is possible due to tetraploid varieties in potatoes. It also risks carrying pests and diseases from one generation to the next – leading to the accumulation of pests and diseases with each round of multiplication.

Seed innovation

Prof Franke explains that Solynta BV, a seed company based in the Netherlands that produces potato varieties that can be grown from seed, has included South Africa in their research efforts because it is one of Africa’s largest producers and exporters. Through his academic relationship with Wageningen University and Research, a Dutch institution renowned for its agricultural endeavours and food production, the UFS became involved in researching hybrid potatoes grown from seed.

Diploid seeds containing two sets of chromosomes allow easier gene manipulation to increase predictability and speedier genetic progress. The breeding approach enables the incorporation of tolerance to pests, diseases, abiotic stresses (cold, heat, drought) and other desired genetic traits.

Although Prof Franke is optimistic about this research, he is not blind to disadvantages. “Potato seeds are tiny and have little energy reserves, making it harder to grow potatoes from seed than from tubers.” He says potatoes from seed will take longer to cultivate than tubers, as farmers need to grow plantlets from seeds first, adding six weeks to the growing period. “It is possible that commercial farmers can grow potatoes directly from seed. Alternatively, perhaps more likely, specialised growers will produce tubers of potatoes from seed; these tubers are then sold as seed tubers to other potato farmers, who then continue their normal practices of producing potatoes for the market from tubers.”

Financial benefits

Prof Franke says farmers have reason to get excited. “Seed potatoes will reduce input costs, as varieties with enhanced tolerance to pests and diseases require less pesticides. Planting one hectare of potatoes requires three to four tonnes of potato tubers, but only one 25 g packet of potato seeds.” Since potatoes are a more valuable commodity than maize, this technology might also increase farmers’ income potential.

News Archive

UFS Council unanimously reappoints Dr Khotso Mokhele as Chancellor

2015-04-02

Dr Khotso Mokhele, Chancellor of the University of the Free State

The Council of the University of the Free State (UFS) unanimously reappointed Dr Khotso Mokhele as Chancellor during its quarterly meeting held on 13 March 2015. He was first appointed in this portfolio by the Council on 4 June 2010.

“It is an honour for the Council to reappoint someone of this stature as Chancellor of the UFS. With his solid academic background and high profile in the business world, Dr Mokhele has been a great asset to the UFS. On behalf of the Council and the university community, I extend a word of appreciation for the work he has done during his first term as Chancellor of the UFS. He is an exceptional leader, and the university community is looking forward to have him as Chancellor for a second term,” said Judge Ian van der Merwe, Chairperson of the UFS Council.

Dr Mokhele was awarded a BSc Agriculture from Fort Hare University, and continued his studies at the University of California Davis (USA) on the Fulbright-Hays Scholarship Programme, completing his MSc (Food Science) and PhD (Microbiology). He was subsequently a postdoctoral fellow at Johns Hopkins University School of Medicine (USA) and the University of Pennsylvania School of Medicine (USA). Dr Mokhele is the recipient of honorary doctorates from nine South African universities including the UFS, and from Rutgers University in the USA.

He was Chairman of the Rhodes Scholarship Selection Committee for Botswana, Malawi, Namibia, Lesotho and Swaziland (2007-2011), and served on the South Africa at Large Rhodes Scholarship Selection Committee for more than 10 years. As President and Chief Executive Officer (CEO) of the Foundation for Research Development (1996-1999) and the NRF from 1999 to 2006, Dr Mokhele played a central role in providing visionary and strategic direction to the South African science system. He was the Founder President of the Academy of Science of South Africa (ASSAf), Founder President and CEO of the National Research Foundation (NRF), Chairperson of the Economic Advisory Council to the Premier of the Free State (2001-2004), and a member of the Advisory Council on Innovation to the Minister of Science and Technology (2003-2007). His role in securing government and international support for the Southern African Large Telescope Project (SALT) is evidence of his dedication to science in South Africa. The success of this project laid the basis for South Africa being selected to host more than 70% of the Square Kilometre Array, an international mega telescope for radio astronomy.

In recognition of his contribution to the development of science, he was the recipient of the Technology Top 100 Lifetime Achievers Award in 2009 and the National Science and Technology Forum Award in 2005. His role in science is recognised internationally. He was an elected Vice-President: Scientific Planning and Review of the International Council for Science and Chairperson of its Committee for Scientific Planning and Review (2005-2008) as well as a member of the Committee on Developing and Transition Economy Countries of the International Social Science Council (2008-2010). He also represented South Africa on the executive board of UNESCO, and was awarded the Member Legion of Honour of the Republic of France for his work in strengthening scientific ties between South Africa and France.

Dr Mokhele currently serves as Special Advisor to the Minister of Science and Technology, the Honourable Naledi Pandor. His current corporate positions include: Non-Executive Chairman: Board of Directors, Impala Platinum Holdings Ltd (Implats); Lead Independent Non-Executive Director: African Oxygen Ltd (Afrox); Non-Executive Director of Zimbabwe Platinum Holdings Ltd (Zimplats); Hans Merensky Holdings Ltd; and Tiger Brands Ltd. He is the President of the Hans Merensky Foundation (South Africa) and a Trustee of SciDev.Net (a web-based scientific magazine based in London, UK) and Start International Inc (USA).

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