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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

School of Medicine not closing

2009-10-22

There is no immediate threat that the University of the Free State’s (UFS) School of Medicine will be closing.

This was confirmed by Prof. Gert van Zyl, Head of the UFS’s School of Medicine and acting Dean of the Faculty of Health Science, following media reports that Prof. Andries Stulting has indicated in a meeting with other medical schools and parliamentary standing committee members that the School will have to close due to the serious problems in the health sector.

“This discussion should be seen in context. Prof. Stulting, in his capacity as acting Head of the School of Medicine, and on behalf of the School and the Faculty, sent a proactive warning to the Free State Health Department, the Member of the Executive Committee and the Premier of the Free State regarding the long-term consequences of the health crisis. This statement was not interpreted correctly. Everything that Prof. Stulting said has already been included in the position statement that the School released in May 2009. What is urgent, though, is that the problems that were identified at especially Pelonomi Hospital in May this year were still not addressed,” said Prof. Van Zyl.

According to Prof. Van Zyl, problems at Pelonomi Hospital include not enough beds, lack of funding for the health sector in the Free State and in some instances problems with filling vacant positions.

“Some of these problems have already been addressed by the Free State Department of Health. Our training platform includes not only Pelonomi Hospital, but also Universitas Hospital, National Hospital, the Free State Psychiatric Complex and several clinics in the Bloemfontein area. This means that there are other facilities available that function in order to provide appropriate training to undergraduate students. Therefore, training is not in immediate danger and the School will definitely not be closing,” he said.

“New first-year students will start their studies in 2010 and I can assure you that there will be adequate training opportunities to take in and train students. However, we do struggle with a bigger intake as requested by Government. I want to put Prof. Stulting’s remark in context: He referred to postgraduate students and therefore the specialists who are in training,” said Prof. Van Zyl.

According to Prof. Van Zyl the specialists in training is a problem that was discussed with the Free State Health Department – with specific reference to less time in operating theatres and the number of beds at Pelonomi Hospital. “We are of the opinion that, should the Department address this problem as a matter of urgency, there will be no long-term damage to the training of these specialists in training. These are the students that Prof. Stulting was referring to,” he said.

The School received more than 1 500 applications for undergraduate studies in 2010 – all of these applications met the minimum selection requirements for the 140 available places. “Our current undergraduate students are therefore not influenced and they will continue to receive the quality training for which the School is renowned,” he said.

Prof. Jonathan Jansen, Rector and Vice-chancellor of the UFS, is aware of this and he satisfied himself as to the situation when he visited the hospitals in Bloemfontein on Friday, 9 October 2009. The national Minister of Higher Education and Training, Dr Blade Nzimande, was also informed of the School’s concerns when he visited the UFS in September 2009.

Media Release
Issued by: Lacea Loader
Deputy Director: Media Liaison
Tel: 051 401 2584
Cell: 083 645 2454
E-mail: loaderl.stg@mail.uovs.ac.za

22 October 2009

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