Genes found in wild grasses could help crops resist rust
pathogens.
Image: iStockphoto

University of Adelaide researchers have identified new sources of stem and leaf rust resistance in wild grass relatives of wheat sourced mostly from the `fertile crescent' of the Middle East.

The research project, supported by growers and the Australian Government through the Grains Research and Development Corporation (GRDC), has helped position the Australian grains industry to better defend against emerging rust races such as the virulent Ug99 stem rust pathogen, which scientists believe may pose a serious threat to global wheat supplies.

Project supervisor Dr Ian Dundas, of the School of Agriculture, Food and Wine at the University of Adelaide, said the project was part of a concerted global effort helping to underpin the sustainability of wheat cultivation.

"Australia is in an excellent position to combat the threat of cereal rust," Dr Dundas said. "This is one of many projects under the Australian Cereal Rust Control Program developing new sources of rust resistance for growers.

"Nearly two decades ago, the Australian Cereal Rust Control Program and GRDC recognized the danger to the economic viability of Australian wheat growers from the emergence of new strains of rust and began investing heavily in this type of research.

"In the long term, this work will assist Australia's competitive advantage in the global market place for wheat.

"Finding alternative sources of resistance is vitally important. Diversity in resistance genes and variation in sources of resistance is one of our best defences when confronting any new rust pathotypes."

The project has involved working with wheat breeding lines which contain chromosome fragments from uncultivated relatives of wheat.

"These are mostly wild grasses from the region in the Middle East where modern bread and durum wheat species originated," Dr Dundas said. "The fertile crescent is a centre of genetic diversity."