Senior Research Scientist Dr
The research, by the
"Powdery mildew is a significant problem wherever barley is grown around the world," says Dr Little. "Growers with infected crops can expect up to 25% reductions in yield and the barley may also be downgraded from high quality malting barley to that of feed quality, with an associated loss in market value.
"In recent times we've seen resistance in powdery mildew to the class of fungicide most commonly used to control the disease in
The discovery means researchers have new targets for breeding powdery mildew resistant barley lines.
"Powdery mildew feeds on the living plant," says Dr Little. "The fungus spore lands on the leaf and sends out a tube-like structure which punches its way through cell walls, penetrating the cells and taking the nutrients from the plant. The plant tries to stop this penetration by building a plug of cell wall material - a papillae - around the infection site. Effective papillae can block the penetration by the fungus.
"It has long been thought that callose is the main polysaccharide component of papilla. But using new techniques, we've been able to show that in the papillae that block fungal penetration, two other polysaccharides are present in significant concentrations and play a key role.
"It appears that callose acts like an initial plug in the wall but arabinoxylan and cellulose fill the gaps in the wall and make it much stronger."
In his PhD project,
"We can now use this knowledge find ways of increasing these polysaccharides in barley plants to produce more resistant lines available for growers," says Dr Little.
Keywords for this news article include: Cell Wall, Cellular Structures, University of
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