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The impact of cereal killers on food security

25 March 2022 | Story Leonie Bolleurs | Photo Charl Devenish

Prof Liezel Herselman Inuagural Lecture — At the inaugural lecture were from the left: Prof Danie Vermeulen, Dean of the Faculty of Natural and Agricultural Sciences, Prof Liezel Herselman, Dr Adré Minnaar-Ontong, Senior Lecturer in the Department of Plant Sciences and Subject Head of Plant Breeding, and Dr Molapo Qhobela, Vice-Rector: Institutional Change, Strategic Partnerships and Societal Impact.

Prof Liezel Herselman, Academic Head of the Department of Plant Sciences at the University of the Free State (UFS),) delivered her inaugural lecture on the Bloemfontein Campus this week (24 March 2022). The theme of the lecture was the ongoing battle against destructive cereal killers.

With 28 years of extensive experience as a researcher, her work focuses on marker-assisted disease resistance breeding in wheat within a South African context. When she joined the UFS in 2004, Prof Herselman decided to apply her research expertise in marker-assisted breeding to the problems faced by wheat producers in the Free State and Northern Cape. The Free State is one of the major dryland wheat production areas in South Africa, while irrigation wheat is produced along the major rivers in the Northern Cape.

Protection against fungal diseases

Concentrating specifically on Fusarium head blight (or wheat scab) and three rust diseases – leaf rust, stem rust, and stripe rust – she has done work to provide wheat plants with ‘tools’ to protect themselves against these fungal diseases.

According to Prof Herselman, there are many genes available in different wheat genotypes and related grass species that provide excellent protection against various races of these diseases. “Some of these genes provide protection or resistance from the seedling stage, while others provide resistance at the adult plant stage. We are thus aiming to combine as many of these genes as possible into a single wheat cultivar, without compromising yield and bread-making quality.”

She says the genes are combined by making crosses between resistant and susceptible cultivars or lines. Conventionally, through a time-consuming process, the incorporation of these genes is tested in the greenhouse and field by infecting plants with the disease to see which plants are resistant and which are not.

They can, however, follow the transfer of these genes to newly developed lines by applying molecular markers. Prof Herselman explains: “A molecular marker is a genomic fragment linked to the gene, which we can follow in the offspring we create from the crosses using different DNA techniques in the laboratory. This enables us to select new wheat lines that contain the highest number of resistance genes. The identified best lines are then used in further crosses and/or released as pre-breeding lines to commercial wheat breeding companies.”

Impact on food security

Her research has an impact on society by providing food security to both commercial and small-scale producers, as well as the end users of wheat (people buying bread and other wheat products). As researcher, it is also important for her to send out students to the workplace who can continue with this task in future.

Prof Herselman believes that when cultivars with fungal-disease tolerance or resistance are released and used by producers, it not only reduces the cost of spraying against diseases, but also increases yields by protecting the crop against fungal diseases. “We live in a world where the population is increasing daily, but land available for agriculture is not increasing and some areas are even lost due to urban development. Increasing yield in available production areas will thus have a positive impact on food security,” she says.

Besides contributing to the country’s food security, she takes pleasure in every aspect of her work. Although she misses the hands-on part of the work as academic head of the department and getting her hands dirty, she still enjoys managing the different research projects (from the conceptualisation phase to data analysis and publishing of results). The part she loves the most is to see the growth in her postgraduate students – from the moment they enter the laboratory for the first time until the day they walk out of the laboratory with their degrees.

“It adds purpose to my life knowing that I have made a difference in a student’s life and equipped him or her with the necessary tools to be successful in the marketplace. Being able to share your knowledge is a gift, but with that gift comes a lot of responsibility as well. I am, however, up for the challenge,” concludes Prof Herselman.

News Archive

Top matriculants for Kovsies

2014-01-24

From left are: Saneliswe Khambule, Lungile Mkhungo, Jannie de Wet, Anje Venter, Siqiniseko Buthelezi and Abrille Beukes.
Photo: Hannes Pieterse

Hailing from top schools in KwaZulu-Natal (KZN), Naushad Mayat, Lungile Mkhungo and Siqiniseko Buthelezi share 20 distinctions between them. Leaving the province of the Zulu Kingdom for Bloemfontein, all three are at Kovsies to study as doctors.

Naushad obtained eight distinctions, an achievement that placed him in the top ten matriculants in KwaZulu-Natal. The former learner from Glenwood High School in Durban came fourth in the Umlazi District and tenth overall in the province. Enrolling for a degree in Medicine, he will join the list of outstanding health professionals Kovsies produce every year.

Lungile, who matriculated from Kingsway High School, attained seven distinctions and her average percentage was 90%. She received distinctions in English – 90%, IsiZulu – 94%, Mathematics – 83%, History – 92%, Physics – 89%, Life Sciences – 89% and Life Orientation – 93%. Lungile is not only clever, but also performed well in sports at her school, participating in netball, soccer and athletics. This future doctor is a proud resident of Wag-'n-Bietjie residence.

Siqiniseko made history at his school, Maritzburg College, becoming the first black Head Prefect at the 150-year-old school, the oldest boys' high school in KZN and one of the oldest schools in South Africa. A gifted learner excelling in sport, culture and academics, Siqiniseko obtained five distinctions (English, Afrikaans, Life Orientation, Accounting and Life Sciences). His sporting prowess has seen him captaining Maritzburg College's first rugby team, as well as the KZN Academy team.

The three are joined by fellow KwaZulu-Natal resident, Saneliswe Khambule, Namibian Abrille Beukes and Free Staters Anje Venter and Jannie de Wet.

Saneliswe, a former learner of Menzi High School in Umlazi, received five distinctions in her final-year exams. The Emily Hobhouse resident registered for a Forensic Science degree and plans on doing her doctoral studies in this exciting career field.

Abrille Beukes is another future doctor and is all the way from Windhoek in Namibia. Abrille obtained a ‘one’ in all her subjects, the highest possible mark in the Namibian school system. The Windhoek-born student received high levels in Mathematics, Accounting, Physical Science, Biology, Afrikaans and English. As second best student in her home country, she will register for a Medicine degree.

Anja, the Free State’s top achiever, received an average percentage of 93% in the matric final exams. The former Eunice student obtained nine distinctions, an achievement that placed her in the national top 100 matriculants. Anja enrolled for a BSc Actuarial Science degree and will be joined in class by former school friend, Jannie de Wet, who obtained a whopping ten distinctions. Jannie and Anja attended Universitas Primary School together, with Jannie finishing his school career at Jim Fouché High School, and just like Anja, he will also enrol for a BSc Actuarial Science degree.

Jannie obtained distinctions in Afrikaans, English, Mathematics, Mathematics (third paper), Life Orientation, Accounting, Physical Science, Life Science, Economics and Information Technology. Jannie is also the Volksblad and the University of the Free State’s 2013 Matriculant of the Year.

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