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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.

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Qwaqwa Campus honours academic excellence

2017-05-18

Photo: Ian van Straaten

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Qwaqwa Campus kicked off the 2017 graduations season of the University of the Free State in style when over 550 degrees and certificates were conferred in three sessions on 12 and 13 May 2017. These included five PhDs from the Faculty of Natural and Agricultural Sciences.

In his maiden speech delivered during the two ceremonies on Friday 12 May 2017, the newly-appointed Vice-Chancellor and Rector, Prof Francis Petersen, emphasised the interconnectedness of graduates with other stakeholders in their communities.

“Never forget the role played by other people who sacrificed a lot for you to be here today. Recognise the extra mile that someone was willing to go for you to graduate,” he said to an enthusiastic audience that included Grade 12 learners from neighbouring schools.

Prof Petersen also reminded the graduates that not everybody had an opportunity to enter, enrol, and eventually graduate at a university. “You are part of the privileged few, and I am confident that the UFS has given you an equal opportunity to reach your full potential. You have had years of exposure to ideas and experiences on diversity. You now have the opportunity to show the world and to use what you have learnt beyond a classroom,” he added.

“Go out there and open doors for others as much as they were opened for you. I implore you to carry over your experiences of diversity and use them to build a better world. Go out there and build a better world, not only for yourself but for everyone in need. Expand your influence, reach out, and be accountable,” he said.

“South Africa needs your skills,
innovation, knowledge, expertise,
and creativity.”

Make your own unique contribution
The session held on Saturday 13 May 2017 saw the Principal of Motheo TVET College and Qwaqwa Campus alumnus, Dipiloane Phutsisi, having a heart to heart with the graduates from the Faculty of Education.

“Our contribution to the world as graduates will not be measured by the wealth we accumulate or the accolades we receive, but rather by the way in which we share our unique gifts with the world. And the only place to find those gifts is to look within yourself. As the class of 2017, make your own unique contribution,” she said.

“Your graduation takes place at a particularly challenging time in the history of our democracy. It happens at a time when our nation is engulfed by racial polarisation, anger, confusion about what democracy and freedom mean to us, and at a time when the pillars of morality are tested.”

“As you graduate, I wish to remind you that our country needs you more than ever before. South Africa needs your skills, innovation, knowledge, expertise, and creativity,” she said.

Three members of the current SRC were also among the graduates. They are the President, Njabulo Mwali (BSc Information Technology), Sports Affairs Officer, Ntokozo Thango (BA Sociology), and Student Development and Environmental Affairs Officer, Ntokozo Masiteng (BA Sociology).

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