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08 October 2020 | Story Leonie Bolleurs | Photo Supplied
Dr Cornel Bender
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

RAG resilience shines despite rain
2017-02-07

Description: Rag 2017 Tags: Rag 2017

Winning float for 2017: Armentum, Vergeet-My-Nie,
and Emily
Photo: Lelanie de Wet 

Although the 75th RAG festivities were challenged by ominous weather, in true Kovsie spirit students and organisers still made a gleaming success of the day. 

Students help to create sunny feeling
On 6 February 2017, the annual float-building activities culminated in the handing over of schoolbags to 150 learners from schools in and around Bloemfontein. This took place at the Rag Farm on the Bloemfontein Campus of the University of the Free (UFS), since the morning procession to Twin City Mall in Heidedal had to be cancelled due to bad weather.

“It is of course a huge disappointment to all of us that the events had to be cancelled, but we are grateful for the rain,” said Karen Scheepers, Head of Kovsie Rag Community Service and Assistant Director: Student Affairs.

The evening KFC Rag procession took place as planned, with students having the option of taking part despite the weather. Unfortunately, the Chevrolet Music Festival had to be cancelled.

“The very important actors of today are our students who have worked long hours to build the floats and who have worked together to make this rainy day on the outside feel sunny inside,” said Prof Francis Petersen, incoming UFS Vice-Chancellor and Rector, when he addressed the crowd at the Rag Farm. Prof Petersen will take up office on 1 April 2017.

Armentum, Vergeet-My-Nie, and Emily take honours
Armentum, Vergeet-My-Nie, and Emily Hobhouse were the overall winners of the 2017 Rag float-building. “It was worth the hard work. Always remember to ask for advice during float-building,” said Pieter Kotze, RC Rag of Armentum residence on the Bloemfontein Campus. “I also want to thank both the RC Rag from Vergeet-My-Nie and Emily Hobhouse.”

The float theme was Proudly South African, and the winning float encapsulated it with local flavours such as Chappies, a Rooibos tea box and a Lion matchsticks box. They also went the extra mile by incorporating each hostel’s logo within a Chappie design.

The Central Rag Committee would like to thank all their sponsors who made the events possible. The Rag Coronation Ball will take place on 17 February 2017, where the new Rag Queen and Mr Rag will be crowned.

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