Absence of detectable yield penalty associated with insensitivity to Pleosporales necrotrophic effectors in wheat grown in the West Australian wheat belt
MetadataShow full item record
Genetic disease resistance is widely assumed, and occasionally proven, to cause host yield or fitness penalties due to inappropriate activation of defence response mechanisms or diversion of resources to surplus preformed defences. The study of resistance gene trade-offs has so far been restricted to biotrophic pathogens. In some Pleosporales necrotrophic interactions, quantitative resistance is positively associated with insensitivity to effectors. Host lines that differ in sensitivity can easily be identified amongst current cultivars and advanced breeding lines. Large wheat cultivar trials were used to test whether lines sensitive or insensitive to three necrotrophic effectors from Pyrenophora tritici-repentis and Parastagonospora nodorum differed in yield when subjected to natural disease and stress pressures in the West Australian wheat belt. There was no significant yield penalty associated with insensitivity to the fungal effectors ToxA, SnTox1 and SnTox3. Some yield gains were associated with insensitivity and some of these gains could be attributed to increased disease resistance. It is concluded that insensitivity to these effectors does not render such plants more vulnerable to any relevant biotic or abiotic stress present in these trials. These results suggest that the elimination of sensitivity alleles for necrotrophic effectors is a safe and facile strategy for improving disease resistance whilst maintaining or improving other desirable traits.
Showing items related by title, author, creator and subject.
Tan, Kar-Chun; Phan, Huyen Phan; Rybak, K.; John, E.; Chooi, Y.; Solomon, P.; Oliver, Richard (2015)Necrotrophic diseases of wheat cause major losses in most wheat growing areas of world. Tan spot (caused by Pyrenophora tritici-repentis) and septoria nodorum blotch (SNB; Parastagonospora nodorum) have been shown to ...
Sensitivity to three Parastagonospora nodorum necrotrophic effectors in current Australian wheat cultivars and the presence of further fungal effectorsTan, Kar-Chun; Waters, O.; Rybak, K.; Antoni, E.; Furuki, E.; Oliver, Richard (2013)Parastagonospora nodorum is a major fungal pathogen of wheat in Australia causing septoria nodorum blotch (SNB). P. nodorum virulence is quantitative and depends to a large extent on multiple effector-host sensitivity ...
A unique wheat disease resistance-like gene governs effector-triggered susceptibility to necrotrophic pathogenFaris, J.; Zhang, Z.; Lu, H.; Lu, S.; Reddy, L.; Cloutier, S.; Fellers, J.; Meinhardt, S.; Rasmussen, J.; Xu, S.; Oliver, Richard; Simons, K.; Friesen, T. (2010)Plant disease resistance is often conferred by genes with nucleotide binding site (NBS) and leucine-rich repeat (LRR) or serine/threonine protein kinase (S/TPK) domains. Much less is known about mechanisms of susceptibility, ...