Root lesion nematodes
The Rlnn1 locus on chromosome 7A confers moderate resistance against the root lesion nematode P. neglectus. Using an Excalibur/Kukri population, we added many new markers near Rlnn1 and we checked how well they validate across Australian germplasm. We have provided assay protocols to wheat breeders. Results have been published in BMC Plant Biology and PhD student Dimanthi Jayatilake presented results on the Rlnn1 chromosome region in a poster at the 12th International Wheat Genetics Symposium.
We have investigated several synthetic hexaploid wheats as sources of resistance against the root lesion nematode P. thornei. For each of these, we mapped resistance loci on chromosomes 2B and 6B. We tested markers from these regions across Australian germplasm, and provided assay protocols for selected markers to wheat breeders. Postdoc Kelvin Khoo presented results in a poster at the 12th International Wheat Genetics Symposium.
Now, we are investigating several other sources of resistance (wheat landraces, the cultivar Chara, the Gatcher selection GS50a) and tolerance (EGA Gregory) against P. thornei.
Photograph: Sharyn Taylor, SARDI