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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

Universities now public spaces to exercise citizenship

2016-08-30

Description: Prof Lis Lange critical conversation Tags: Prof Lis Lange critical conversation

Prof Lis Lange believes universities have a critical
role to play in advancing democracy.
Photo: Thabo Kessah

In an attempt to promote common understanding on governance, leadership, and management processes at the University of the Free State (UFS), the Institute for Reconciliation and Social Justice (IRSJ) recently hosted a critical conversation on the Qwaqwa Campus that was facilitated by Vice-Rector: Academic, Prof Lis Lange.

Prof Lange’s presentation firstly focused on the role that universities play, and the expectations thereof.

“From ancient history, universities have always had a critical role to play in the broader society,” she said. “They have always been characterised by the circulation of knowledge and ideas at a global level. They have always ensured that students’ skills and knowledge are properly certified.”

According to her, universities have changed quite a bit over the centuries.

“Historically, universities used to cater for the chosen few, but they now allow multitudes to have access as well. In the early 20th century, women and foreigners, for example, were excluded. How they relate to the society has also changed. They also used to create certain types of knowledge – at one stage this knowledge was influenced by the church. Research is now produced across a large spectrum of human and scientific knowledge,” she said.

Prof Lange also added that universities now even have a responsibility to advance democracy and to respond to societal needs.

“Despite the various tensions and contradictions between management and academic staff, between management and students, and between academic staff and students, universities are now public spaces to exercise citizenship. They provide space for all to have the right to speak and to be heard. They provide space for all to have similar rights and responsibilities,’ she said, while breaking down all the governance, leadership and management structures of the UFS.

The conversation was concluded with a question and answer session, with students mainly asking about internal UFS processes.

The session was well received by students.

“I really loved the conversation, which to me, was about breaking the walls between the management and students so as to achieve the goal of an effective university. We need more of these dialogues,” said Noxola Tshabalala, a BA Psychology student.

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