CROP IMMUNISATION CAN ROOT OUT TAKE-ALL FUNGUS
Natural use of biology to control disease in crops is the Holy Grail of agriculture, and a team of young researchers has found a way of easing cereals’ risks from a deadly root pathogen.
In the soils of the world’s cereal fields, a family tussle between related species of fungi is underway for control of the crops’ roots, with food security threatened if the wrong side wins. Beneficial fungi can help plants to protect themselves from cousins eager to overwhelm the roots, but it’s a closely fought battle.
Working out the right conditions to support those beneficial fungi and identifying the cereal varieties that are best suited to make the most of that help is no mean task, but now a young team of scientists from Rothamsted Research has come up with some answers. Their complete findings are published today in the Journal of Experimental Botany.
Take-all is a devastating root disease of cereal crops worldwide caused by the fungal pathogen, Gaeumannomyces tritici. Related species, notably G. hyphopodioides, are capable of immunising plant roots against the pathogen. Farmers struggle to control the disease because few chemical seed treatments are available and current biological strategies are hindered by the variety of soil types.
“This work aimed to explore whether wheat genetics can be exploited to help support and potentially build up populations of closely related take-all suppressing fungal species that are known to lower the disease levels caused by the take-all fungus,” says Vanessa McMillan, co-author and postdoctoral researcher in plant pathology.
The team collected samples of the beneficial fungus from the fields of Rothamsted Farm and developed a laboratory test to explore their ability to colonise and protect the roots of barley, rye, wheat and the rye/wheat hybrid, triticale. In field trials, the team identified commercial cereal varieties that performed better than others.
Beneficial fungus, G. hyphopodioides, colonises the root of a Hereward wheat seedling (x67 magnification), immunising the plant against the take-all root disease, caused by the related pathogen, G. tritici; top, the field trials on Rothamsted Farm
“If the ability of wheat cultivars to support and be colonised by natural or introduced populations of beneficial Gaeumannomyces species could be harnessed and exploited, either through a seed dressing or via direct application into a crop’s rooting zone, this could provide a potential biological management strategy for the control of take-all disease in wheat crops,” notes McMillan, who leads the take-all research group at Rothamsted.
Understanding the complex interactions between the fungi and the cereal hosts will yield more information for developing strategies to control the disease.
“The future of take-all control cannot rely upon a single solution to combat the disease,” says Sarah-Jane Osborne, whose PhD in crop pathology focused on this research. “The results of our study show that certain current winter wheat varieties can strongly support naturally occurring populations of take-all suppressing fungi.
“If this ability can be harnessed, it could aid in decision-making when selecting varieties to grow as an additional practical solution to manage take-all disease,” adds Osborne, who is now Field Trials Manager in Crop Production Systems at the Agriculture and Horticulture Development Board (AHDB).
“Our ability to manage take-all is currently limited and having an effective genetic solution would be very beneficial to growers,” says David Langton, Head of R&D and Stewardship at Agrii, a company of agronomists. “Therefore, Agrii was pleased to support Sarah-Jane’s PhD to develop a better understanding of the disease and potential management options.”
Additional positive endorsement of the research comes from Simon Oxley, Head of Crop Production Systems at AHDB, which also supported Osborne’s PhD studies at Rothamsted and the University of Nottingham: “Take-all is a damaging root disease that can cause major yield and quality losses, particularly in subsequent wheat crops, as pathogen pressure builds in the soil.
“Sarah-Jane’s research is a step forward in understanding the complex relationship between variety, pathogen and potentially beneficial root colonising fungi. I can foresee a time when growers will be able to select varieties that combine positive characteristics to minimise the damaging effect of this disease, thus contributing to the sustainability of crop production.”
Rothamsted’s take-all research group, led by McMillan, is part of one of the institute’s five strategic programmes, namely Designing Future Wheat, a multi-institute initiative that focuses specifically on improving overall crop value and resilience. The work is funded by the Biotechnology and Biological Sciences Research Council (BBSRC) and the Lawes Agricultural Trust (LAT).
Sarah-Jane Osborne, Field Trials Manager
Crop Production Systems, AHDB
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About Rothamsted Research
Rothamsted Research is the longest-running agricultural research institute in the world. We work from gene to field with a proud history of ground-breaking discoveries, from crop treatment to crop protection, from statistical interpretation to soils management. Our founders, in 1843, were the pioneers of modern agriculture, and we are known for our imaginative science and our collaborative influence on fresh thinking and farming practices.
Through independent science and innovation, we make significant contributions to improving agri-food systems in the UK and internationally. In terms of the institute’s economic contribution, the cumulative impact of our work in the UK was calculated to exceed £3000 million a year in 20151. Our strength lies in our systems approach, which combines science and strategic research, interdisciplinary teams and partnerships.
Rothamsted is also home to three unique resources. These National Capabilities are open to researchers from all over the world: The Long-Term Experiments, Rothamsted Insect Survey and the North Wyke Farm Platform.
We are strategically funded by the Biotechnology and Biological Sciences Research Council (BBSRC), with additional support from other national and international funding streams, and from industry. We are also supported by the Lawes Agricultural Trust (LAT).
For more information, visit https://www.rothamsted.ac.uk/; Twitter @Rothamsted
1Rothamsted Research and the Value of Excellence: A synthesis of the available evidence, by Séan Rickard (Oct 2015)
The Biotechnology and Biological Sciences Research Council is part of UK Research and Innovation, a non-departmental public body funded by a grant-in-aid from the UK government.
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The Lawes Agricultural Trust, established in 1889 by Sir John Bennet Lawes, supports Rothamsted Research’s national and international agricultural science through the provision of land, facilities and funding. LAT, a charitable trust, owns the estates at Harpenden and Broom's Barn, including many of the buildings used by Rothamsted Research. LAT provides an annual research grant to the Director, accommodation for nearly 200 people, and support for fellowships for young scientists from developing countries. LAT also makes capital grants to help modernise facilities at Rothamsted, or invests in new buildings.