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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

UFS researcher fills void in South African policing history

2017-01-02

Currently a Postdoctoral fellow in the International
Studies Group, Dr Cornelis Muller’s PhD thesis explores
late nineteenth century South African policing on the
Witwatersrand.
Photo: Rulanzen Martin

“I used policing on the Witwatersrand as a lens through which to examine aspects relating to state formation within the South African Republic.”

This is how Dr Cornelis Muller, a postdoctoral fellow in the International Studies Group at the University of the Free State (UFS), described his PhD thesis called Policing the Witwatersrand: A history of the South African Republic Police, 1886-1899. The thesis fills an empirical void in the history of settler colonial policing in South Africa.

His research was also featured in the South African Historical Journal, which is published by Routledge. Dr Muller received his PhD from the UFS during the 2016 Winter Graduation ceremonies. He received a scholarship from the university to conduct his three-year research.

Relationship between police and state examined
The study presents itself as an institutional biography in which the relationship between the South African Republic Police (known as the Zarps), the state, and broader society are examined. The period under investigation was a time when political, economic, and social complexities on the Witwatersrand created tension between South Africa and Great Britain.

An important theme throughout the thesis is the relationship between the police, the mining industry, and the so-called Uitlander community. Crime was also an important contributing factor to the complex relationship that developed between the Zarps and the policed in Johannesburg’s formative years.

“Johannesburg was a town under siege by a variety of crimes which ranged from vagrancy, drunkenness, gambling, and prostitution to robbery, murder, and assault,” said Dr Muller.

Archives in South Africa and Great Britain consulted
“My thesis follows a chronological approach in which various themes accounting for the development of the police on the Witwatersrand are highlighted.” Framed within the bureaucratic and administrative functioning of the Zarps, he examined aspects relating to crime, crisis, and conflict between the police and society. The thesis also details the relationship between the police and Johannesburg’s black community.

As with any historical research, it comprised internal and external source criticism and content analyses of a wide range of archival records.

Dr Muller had the opportunity to visit several archives and libraries in South Africa and Great Britain. “Some of the more important archival collections were assessed at the National Archives in Pretoria.” These included the Archive of the State Attorney and the Archive of the Magisterial District of Johannesburg.

“My study thus adds to scholarship that seeks to provide a more nuanced understanding of the South African Republic’s administrative functioning and internal politics in the late nineteenth century,” concluded Dr Muller.

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