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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

Race, technology, and maritime labour in the 19th century

2016-06-23

Prof John T. Grider

“When employers
impose
worker identity,
it creates problems.”

What does identity mean to people today, and how is it formed? Religion, politics, race, ethnicity, and gender make up individual and community identity. However, Prof John Grider (University of Wisconsin – La Crosse) is of the opinion that employment moulds our identity, since we spend so much time on the job.

Prof Grider joined the Institute for Reconciliation and Social Justice (IRSJ) on the Bloemfontein and Qwaqwa Campuses to discuss his research on the maritime industry, published in his book, Foreign Voyage - Pacific Maritime Labour Identity: 1840 to 1890. “When employers impose worker identity, it creates problems,” he said. Particularly, this “creates instability in communities, and a vulnerability and insecurity amongst the employees”.

To illustrate his point, Prof Grider expanded on the history of 19th-century Atlantic sailors, a highly-skilled workforce, who failed to adapt to changes in their labour environment. Initially, the sea-faring community was very diverse racially. However, as the Pacific, and particularly Asian, marine community gained precedence, this tide turned to such an extent that, in 1886, the Atlantic sailors formed their own Coastal Seamen’s Union in San Francisco, causing a split between Asian and non-Asian sailors. Atlantic sailors had failed to integrate with the new technology of the day (steam power), nor had they accepted the demographic changes that flooded their community rapidly with cheap labour from Chinese shores.

Prof Grider highlighted the need to maintain an adaptable mentality in the ever- and rapidly-changing labour world, since division amongst workers could lead only to further exploitation of the workforce.

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