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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

Many changes for Shimlas, says new captain

2016-01-25

Description: 2016 Shimla Neil Claassen Tags: 2016 Shimla Neil Claassen
The versatile forward, Neil Claassen, will lead the Shimlas onto the field in the 2016 Varsity Cup. Photo: Johan Roux.

The University of the Free State (UFS) has a new group of rugby players, a new head coach, and a new captain.

This is how the Shimla skipper, Neil Claassen, summed up his team's approach to the 2016 Varsity Cup.

Although the UFS will start the tournament as defending champions, the 23-year-old Claassen believes that much has changed since 2015.

One of which is his appointment. The flanker, who can play lock as well, was recently appointed as Varsity Cup captain in his third series.

The former Springbok flanker, Hendro Scholtz, took over as head coach from Franco Smith, who is now the Cheetahs trainer. Mac Masina, former centre for the Lions, is a new assistant coach.

New year with more pressure

Because of all the changes, Claassen feels that the Shimlas will need a different approach to the 2016 tournament.

“There will definitely be more attention on us (as champions). However, the guys in the camp see it as a new year,” he said.

“There is pressure, but we don't focus on that too much.”

Previous leaders set example

According to Claassen, he has never before led a team for which he played.

“I didn't expect to be captain,” the former pupil of Paarl Gymnasium said.

“This is something new. I have played with good leaders like AJ (Coertzen) and Oupa (Mohoje) before, and will take forward what I have learned from them.”

He also believes that there are several senior players, such as the vice-captain, Pieter-Steyn de Wet, who will assist him in his leadership role.

Back from injury

Claassen has played Currie Cup, Vodacom Cup, U21 and U19 rugby for the Free State.

However, a knee injury kept him out of action for nine months and he missed the last three Varsity Cup matches of 2015.

He returned for a training match against the University of Johannesburg in Kroonstad on 23 January 2016. The Shimlas also played a warm-up match against the University of KwaZulu-Natal in Bethlehem on 16 January 2016.

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