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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

“I, too, am an African,” says visiting US drama professor

2013-03-06

Africans are of blood and of soil, says Prof Charles Dumas in his inaugural lecture at the UFS. Speaking on the topic I, too, am an African, Prof Dumas reminisced about his life and experiences on the continent.
Photo: Minette Grove
05 March 2013

Lecture (pdf)

What is an African? Is it those born in Africa, defined in racial and genealogical terms, or those who identifies with the continent in nationality and ancestral location? Did the descendants of enslaved Africans in the US, the Caribbean or Brazil lose their Africaness when their ancestors were put on slave ships to the New World?

These were some of the questions raised by Prof Charles Dumas, visiting senior professor in the Department Drama and Theatre Arts, in his inaugural lecture at the university.

Proclaiming attachment to the continent, Prof Dumas told his audience there are two types of Africans: Africans of the blood and Africans of the soil. In a speech titled, “I, too, am an African,” he stated that he lay claim to his ancestral birthright not because of blood relationship to an identifiable ethnic group or birthright to the continent, but because he earned it.

“I suggest another way that one can be an African, is through trial and struggle to be reborn an African in spirit. It is a ritual journey that may be taken by anyone. For, after all, if we are to believe the anthropologists who tell us that human life as we know it began in the Olduvai Gorge, genetically we are all African in origin.”

Prof Dumas, a senior professor at Penn State University in the USA, took the audience on a journey of his experiences on the continent, starting in 1978 when he first came to South Africa as a legal observer. Noticing the changes between Apartheid and today’s South Africa, he said this generation are committed to learn from each other – and that is the most important, he said.

“With their hopes and aspirations they earnestly desire to live in the new South Africa that we promised them. We must support them in their effort. It is time we stored our old baggage in the closet.”

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