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02 January 2025
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Story Gerda-Marie van Rooyen
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Leading the research in South Africa is Prof Linus Franke from the Department of Soil, Crop and Climate Sciences.
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.
Land a fertile field for historians
2017-12-25
Dr Admire Mseba, historian and researcher in the International Studies Group (ISG).
Photo: Charl Devenish
The use of land and the economics of Southern Africa at present is a contentious subject at almost every level of society. A historian and researcher who revels in happenings in these two areas, is Dr Admire Mseba, a postdoctoral research fellow in the International Studies Group (ISG) at the UFS.
Dr Mseba grew up in the Mberengwa region in southern Zimbabwe, known for cattle farming and mineral mining. While at the University of Zimbabwe, he became interested in economic history and archaeology, and completed his PhD at the University of Iowa in the USA. During his time there, Dr Mseba also became passionate about environmental history.
A historian's ability to think and engage critically on diverse subjects drew Dr Mseba to his field. Currently, he is busy with three research projects. Firstly, he is working on a book on social relations, about access to land in Zimbabwe. He is also examining regional and national efforts to control migratory pests during the 20th century, in particular, the red locust. In collaboration with a colleague at the ISG, Dr Mseba is also researching monetary systems in central Africa, covering the present-day countries of Zimbabwe, Malawi, and Zambia.
Dr Mseba believes future research opportunities in the domains of economic and environmental history abound. For one, the land question has been very topical in Zimbabwe for more than a decade—as it is now in South Africa—and needs more scrutiny. Regarding agrarian pestilences, he indicates the recent phenomenon of armyworm invasion. “There are so many opportunities for historians to investigate. There are so many ways to think about these things and trying to put it in perspective.”