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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

International speakers discuss diversity

2014-02-11

Dr Charles Alexander from UCLA
Photo: O'Ryan Heideman

International and local experts recently gathered on the Bloemfontein Campus to deliberate over the topic of diversity.

Student participation and mobility dramatically increased in higher education worldwide. Cultural, political, economic and social factors on a national and global scale, have brought the reality of diversity into the operational spaces of Higher Education Institutions. These challenges are not exclusive to South Africa, though. In the Netherlands and USA, universities are also challenged by the demands of an increasingly diverse student population.

Prof Jonathan Jansen, Vice-Chancellor and Rector of the UFS, acted as one of the keynote speakers during a two-day colloquium hosted by the Institute for Reconciliation and Social Justice. In an impelling address, Prof Jansen argued that change cannot be affected on a university campus if the surrounding community does not change as well. He also noted the spread of a culture of silence surrounding issues of misbehaviour. He urged that we need to find courage again to speak out. From the level of government, media and churches to the private spaces of our homes, we have to co-create an environment of care.

This message closely tied in with that of Prof Shirley Tate’s from the University of Leeds. In her keynote, she asserted that mere tolerance of someone different from you can lead to even more alienation. The path to true reconciliation is grounded in the intimacy of friendship. Friendship and empathy lead to trust and transcend racism.

Another keynote speaker from abroad, Dr Charles Alexander from the University of California, delineated a model for inclusive excellence. He explained that the major problem of true transformation is not due to a lack of ideas, but in the implementation thereof. “Realities of implementation short circuit the change process,” he said. He explained how campus environments can adapt in order to support and enhance lasting inclusivity.

We have to become complicit in the process of transformation, Prof Dr Ghorashi, Professor of Diversity and Integration at the Vrije Universiteit Amsterdam, conveyed. Linking up with the issue of silence, she demonstrated the power of speaking out, using examples from her extensive research among victims of violence. It is imperative, she maintains, that for transformation to materialise, we need to create safe spaces in which we can share our vulnerabilities.

Footnote: Due to unfortunate circumstances, both Prof Dr Ghorashi and Prof Shirley Tate could not personally attend the colloquium as planned. Their respective keynotes were read to the audience on their behalf.

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