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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

Research chair into Higher Education gets boost for five more years

2017-11-21

Prof Melanie Walker, Director of the Centre for Research on
Higher Education and Development (CRHED).
Photo: Supplied

The research Chair in Higher Education and Human Development within the Centre for Research on Higher Education and Development (CRHED) at the University of the Free State has secured funding for another five years. It follows a favourable evaluation by the South African Research Chairs Initiative (SARChI) of the research project at the UFS.

The Director of the Centre, Prof Melanie Walker, says she is delighted by the recognition of the Chair's hard work and significant productivity. “This new round of funding secures the centre and its activities for the next five years.”

Under the auspices of the Chair, research is conducted on higher education, inequalities and social justice, and how or if universities foster the human capabilities and aspirations of students. In essence, the research studies whether higher education makes a difference to the lives of students, their families and communities. Prof Walker says the Chair's projects look at issues of access, participation and transitions into work, as well as gender, race and social class. The research uses quantitative and qualitative methods and includes a strand of participatory research projects with students.

Prof Walker says through the Chair research project, and the Centre, researchers have developed extensive international links and produced international quality research and publications. “We foster high-quality PhD graduates as a new generation of social science academics.” The Chair has in the first five years produced 10 PhDs and four master’s students.

The project in the next five years will continue with its focus on higher education and human development research. Prof Walker says all the research efforts seek to contribute to more justice in society and universities and to contribute to debates, policy and practices in higher education and a scholarly knowledge base.

The Research Chairs Initiative aims to improve the research capacity at public universities to produce high-quality postgraduate students, research and innovative outputs. The assessors looked at features such as the number of students the research entity had trained and how many publications the research team had produced.

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