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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.
UFS cardiac team leading with project
2017-05-31
Prof Peter Schultheiss of the Charité University in Berlin,
Germany, visited the Robert WM Frater Centre for
Cardiovascular Research at the UFS for a study regarding
cardiomyopathy, a significant cause of fatal heart failure
among Africans. From the left are Dr Glen Taylor,
Dr Danie Buys, Prof Makoali Makatoko,
Prof Schultheiss and Prof Francis Smit.
Photo: Rulanzen Martin
A team of cardiac doctors associated with the Robert WM Frater Cardiovascular Research Centre at the University of the Free State’s (UFS) Faculty of Health Sciences has commenced with a pioneering research project regarding idiopathic dilating cardiomyopathy.
An Afrocentric research focus
Prof Francis Smit, Head of the Department of Cardiothoracic Surgery at the UFS and Head of the Frater Centre, describes dilating cardiomyopathy as a heart muscle disease that is quite common, particularly among people of African descent. The disease weakens the heart muscle, which in turn leads to heart failure.
“To date there is no curable treatment for this condition and 50% of patients that have shown heart failure, died within a period of five years. The causes of this condition have been unknown in the majority of patients. But over the past few years major strides have been made where virus infections of the heart muscle or myocarditis have been identified as a possible underlying cause. Various genetic diseases are also linked to it,” says Prof Smit.
International collaborations ensure success
According to Prof Smit, the project is being run in conjunction with Prof Heinz-Peter Schultheiss of the Charité University and the Institute for Cardiac Diagnostics and Therapy in Berlin, Germany.
“We have been working on the project over the past 18 months and I have twice visited Prof Schultheiss in Germany. He is now visiting us in Bloemfontein. We have established a collaborative project focused on patients in central South Africa”.
Prof Schultheiss is a world leader regarding the diagnosis, pathology and treatment of dilating cardiomyopathy, says Prof Smit.
“He brings a lifetime of research experience to Bloemfontein and is internationally renowned as the father of myocardial or heart muscle biopsies.
“His pioneering work on the discipline has led to diagnostic accuracy that has induced purposeful and personalised treatment of dilating cardiomyopathy and has brought about dramatic changes in some subsets of patients’ life expectancy and their cure.”
Solving problems close to home
According to Prof Mokoali Makatoko, Head of the Department of Cardiology, there are more than 1500 new cases of heart failure identified annually at the Universitas Academic Hospital, of which approximately 30% are attributed to cardiomyopathy. “With the use of endomyocardial biopsies the team hopes to treat viruses unique to Southern Africa as well as other underlying causes of dilating cardiomyopathy.”
Prof Stephen Brown, Head of Paediatric Cardiology at the Universitas Academic Hospital, says children suffering from this disease never reach a mature age and those under his supervision will also be undergoing these tests. Various other departments at the UFS will also participate in this project. Profs Makatoko and Brown did the first four endomyocardial biopsies under the management of Prof Schultheiss during the past week. The results will be available in the coming weeks after which the project will be officially launched and patient recruitment will start in earnest.