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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 increases admission requirements

2010-07-26

Admissions criteria for entry to undergraduate programmes at the University of the Free State (UFS) will be increased with immediate effect. This means that students who begin their undergraduate studies in 2011 will need to meet the new admissions criteria in order to register.

“Increasing admissions requirements is a critical component of our unwavering commitment to excellent academic standards and educational quality at the UFS,” said Prof. Driekie Hay, Vice-Rector: Teaching and Learning at the UFS.

“The challenge of student success at most South African universities is something that has attracted increasing attention over the past few years. We believe that it is our responsibility as an educational institution to admit students that we are confident are likely to be successful, and also to provide the very best quality of teaching and learning to ensure success.”

The university is also acutely aware that large numbers of young people in the country attend schools that are not adequately resourced to provide the quality of schooling needed for successful university study.

“We are thus committed to working with schools and with talented learners in order to address this challenge,” said Prof. Hay.

“The university currently has several initiatives in this regard. Further, our innovative and extremely successful University Preparation Programme (UPP) provides an opportunity for students with potential who do not meet the university entrance criteria to complete a bridging year that prepares them for the rigours of university.”

For students who begin their studies in 2011 the following changes will come into effect:

The minimum requirement for entry into undergraduate programmes will increase from 28 points to 30 points.
The minimum requirement for entry into extended programmes will increase from 23 points to 25 points.
The minimum requirement for entry into the University Preparation Programme will increase from 17 points to 20 points.
Subject-specific requirements specified by faculties will remain the same, except for Natural and Agricultural Sciences (contact the Faculty Manager at 051 401 3199).
All programmes that already require a minimum score of 30 points and above will not be changed.
The minimum entrance criteria for the B.Ed. Foundation Phase and B.Ed. Intermediate Phase will increase from 23 points to 25 points.
The minimum entrance criteria for B.Soc.Sc. Nursing will increase from 28 to 29 points.

Performance in the National Benchmark Tests will be used for placing students into academic support modules as needed.

These test results will not be used for admissions decisions in 2011, except for Faculties where it is used as part of their selection process.
Prospective students are encouraged to submit their applications for study in 2011 as soon as possible.
For telephone enquiries, please dial 051 401 3000.

More information (Pdf document, English and Afrikaans)

Media Release
Issued by: Mangaliso Radebe
Assistant Director: Media Liaison
Tel: 051 401 2828
Cell: 078 460 3320
E-mail: radebemt@ufs.ac.za
26 July 2010

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