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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 student government elections declared free and fair

2015-09-04

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Video: SRC announced (Bloemfontein Campus)

The 2015/2016 Student Representative Council (SRC) elections on the Bloemfontein and Qwaqwa Campuses of the University of the Free State (UFS) have been declared free and fair.

The institutional Independent Election Commission Chairperson, Mandla Ndlangamandla, commended the high level of cooperation displayed by all students who participated in the peaceful and organised elections on the Qwaqwa Campus.

“We are proud to indicate that from the beginning of the election process, there were no incidents of intimidation, disruption, threats, and violence that were reported,” he said.

Announcing the election results at Bloemfontein Campus, the representative of the Electoral Commission of South Africa (IEC), Andrew Ndelele, also confirmed that the commission had ensured that the elections were credible.

Voter turn-out increased at both campuses compared to the previous year. The elections, which took place from Friday 28 August to 1 September 2015, saw 8% and 0.7% increases in votes casted at the Qwaqwa and Bloemfontein Campuses, respectively.

Paseka Sikhosana, President-elect of the Qwaqwa Campus, commended the unity and orderliness displayed by students: “After the polling stations had closed, we came together and sang in peace”.

Incoming SRC President of the Bloemfontein Campus, Lindokuhle Ntuli, also endorsed the impartiality of the elections, while expressing how humbled he was by the support he received during the campaigning period.

Bloemfontein elective portfolios:

Bloemfontein Campus president: Lindokuhle Ntuli
Photo: Johan Roux

President: Lindokuhle Ntuli
Vice-President: Mpho Khati
Secretary: Tsietso Mafaso
Treasurer: Katleho Masheane
Culture: Delia Moumakwe
Sport: Kabelo Elijah Noosi
Transformation: Katleho Mmolayeng Letube
Student Accessibility and Support: Victor Fana Sejane
Media and Marketing: Peo Morwesi Segano
First-generation students: Nicola King
Legal and Constitutional Affairs: Luke Harrold Small
Student Development and Environment: Karabo Pheko

Bloemfontein ex officio portfolios:

Associations Student Council: Sikhulekile Luwaca
Academic Affairs Student Council: Letsika Liqoalane
Campus Residences Student Council: Ingrid Wentzel
Commuter Student Council: Audrey Sithebe
Postgraduate Student Council: Kamogelo Dithebe
International Student Council: Takudzwa Gezi
Student Media Council: Hatsu Mphatsoe
Rag Fundraising Council: Tubatsi Moloi
Rag Community Service Council: Johan Diedericks

Qwaqwa Campus president: Paseka Sikhosane
Photo: Thabo Kessah

Qwaqwa elective portfolios:

President: Paseka Sikhosane
Vice-President: Zethu Mhlongo
Secretary: Nondumiso Langa
Treasurer: Palesa Selepe
Student Development and Environmental Affairs: Lindokuhle Ngubane
Media and Publicity: Bongiwe Buthelezi
Politics and Transformation: Nthabiseng Mokoena

Qwaqwa ex officio portfolios:

Academic Affairs: Edward Nkadimeng
Arts and Culture: Kwenzakwenkosi Mthethwa
Sports Affairs: Thabo Zengele
Rag and Dialogue: Dieketseng Mokoena
Religious Affairs: Mamosebetsi Mokoena
Residence Affairs: Pheletso Moekoa
Off-Campus: Nicholas Sibeko

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