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Plant Sciences graduate contributes technique to manage stem rust

08 October 2020 | Story Leonie Bolleurs | Photo Supplied

Dr Cornel Bender received her PhD qualification at the virtual graduation ceremonies in October. The title of her thesis is: Stem rust resistance in South African wheat and triticale.

The rapid distribution of disease-causing organisms such as Ug99, a wheat stem-rust pathotype, pointed out just how vulnerable global cereal production is to disease outbreaks.

These cereals include wheat, barley, rye, oats, triticale, rice, maize, and millet and are one of the most important food sources for human consumption.

According to Dr Cornel Bender, the projected world population of 10 billion in 2057 requires a growth of more than 40% in cereal production. Wheat is grown on more hectares than any other cereal and is one of the most important sources of calories for humans. However, the growth rate of wheat yields has declined from the 1960s to the 1990s. Therefore, it is essential to increase global wheat production.

“With the regular appearance of more aggressive stem rust pathotypes in South Africa, there is a constant need to discover new sources of resistance, understand the genetic base of presently deployed sources in wheat, triticale and barley cultivars, and to manipulate the deployment of resistant sources through a more sustainable approach,” says Dr Bender.

Her PhD thesis, titled: Stem rust resistance in South African wheat and triticale, includes various fundamental aspects for the effective management of stem rust in South Africa.

Dr Bender is a Professional Officer in the Division of Plant Pathology in the Department of Plant Sciences, who received her PhD at the virtual graduation ceremonies in October.

Innovative and cost effective

Her promotors, Prof Zakkie Pretorius, Research Fellow, and Dr Willem Boshoff, Senior Lecturer in the Department of Plant Sciences, believe that she used an innovative approach to develop a cost-effective phenotyping method to select for more durable resistance types in a controlled greenhouse environment.

“In the past, results obtained from field trials used to assess adult plants for stem-rust resistance, were often influenced by abiotic factors, were seasonable in nature, expensive, and time consuming; therefore, the development of a dependable greenhouse screening system provides an important additional instrument for rust research,” says Dr Bender.

She adds that the greenhouse technique is used worldwide to screen for adult plant resistance and contribute to save time and money.

Broadening our knowledge

“Inheritance studies were undertaken to determine the genetic base of stem-rust resistance in selected South African wheat and triticale cultivars (developed from wheat/rye crosses) through seedling analysis as well as greenhouse and fieldwork,” she says.

Dr Bender believes the use and development of different resistance screening methods, the elucidation of host genetics, as well as the use of histological and microscopic methods to study early resistance responses, broaden our knowledge and understanding of stem-rust resistance in South African wheat and triticale cultivars.

Ultimately, rust researchers, grain producers, and also the general public – through access to their daily bread – will benefit from her study.

News Archive

Mandela statues and the issue of public representation

2015-09-04

Prof Grant Parker, Associate Professor of Classics and Co-Director of the Centre for African Studies at Stanford University, USA, presented a public lecture on the Bloemfontein Campus on 27 August 2015, in which he explored the topic of ”Memorialising Mandela after Rhodes Must Fall”. What stories do the multitude of Mandela statues tell us about the man? Our society? Ourselves? These were some of the questions Prof Parker addressed during his lecture.

Paradoxes
Prof Parker discussed some of the paradoxes presented by the Mandela statues. The huge 9m high Mandela statue at the Union Buildings in Pretoria does not necessarily reflect his humility. Iconic statues strewn across the world do not reveal Madiba’s appeal. “Madiba’s charm,” Prof Parker said, “was all about his ability to relate to people of very different backgrounds. People who were his enemies would – to their surprise – find a humanity they were not expecting. It’s very hard to reconcile that with the colossal statues.”

Rhodes Must Fall
On the topic of the Rhodes Must Fall campaign, Prof Parker said that “the debates around it seem to express the frustration of deepening equality in general and lack of demographic change.” He also believes that, although the campaign centres on statues, there are much deeper issues at play that need to be addressed.

Artists should be part of the conversation
Prof Parker also advocated that artists’ voices should be incorporated into the creative processes of public art. “There is a much greater need for creative artists,” he concluded, “to be part of conversations, not only about what we as South Africans want to commemorate, but how we do that. I would very strongly suggest that this be done by non-figural representations.”

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