Prevalence and importance of sensitivity to Stagonospora nodorum necrotrophic effector SnTox3 in current Western Australian wheat cultivars.
MetadataShow full item record
Stagonospora nodorum is a major pathogen of wheat in many parts of the world and particularly in Western Australia. The pathosystem is characterised by interactions of multiple pathogen necrotrophic effectors (NE) (formerly host-specific toxins) with corresponding dominant host sensitivity loci. To date, five NE interactions have been reported in S. nodorum. Two proteinaceous NE (ToxA and SnTox3) have been cloned and expressed in microbial systems. The identification of wheat cultivars lacking sensitivity to one or more NE is a promising way to identify cultivars suitable for use in breeding for increased resistance to this economically important pathogen. The prevalence of sensitivity to the NE SnTox3 was investigated in 60 current Western Australian-adapted bread wheat (Triticum aestivum L.) cultivars. Infiltration of SnTox3 into seedling leaves caused a moderate or strong necrotic response in 52 cultivars. Six cultivars were insensitive and two cultivars exhibited a weak chlorotic response. Five of the cultivars that were insensitive or weakly sensitive to SnTox3 were noticeably more resistant to the disease. The 60 cultivars gave a very similar reaction to SnTox3 and to the crude S. nodorum SN15 culture filtrate demonstrating that SnTox3 is the dominant NE in this isolate. We conclude that a simple screen using both SnTox3 and ToxA effectors combined with simple greenhouse disease evaluation, will allow breeders to select cultivars that are more resistant to the disease, allowing them to concentrate resources on other still intractable breeding objectives.
Showing items related by title, author, creator and subject.
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 ...
Phan, Huyen; Rybak, K.; Furuki, Eiko; Breen, S.; Solomon, P.; Oliver, Richard; Tan, Kar-Chun (2016)Fungal effector-host sensitivity gene interactions play a key role in determining the outcome of septoria nodorum blotch disease (SNB) caused by Parastagonospora nodorum on wheat. The pathosystem is complex and mediated ...
The cysteine rich necrotrophic effector SnTox1 produced by Stagonospora nodorum triggers susceptibility of wheat lines harboring Snn1Liu, Z.; Zhang, Z.; Faris, J.; Oliver, Richard; Syme, Robert; McDonald, M.; McDonald, B.; Solomon, P.; Lu, S.; Shelver, W.; Xu, S.; Friesen, T. (2012)The wheat pathogen Stagonospora nodorum produces multiple necrotrophic effectors (also called host-selective toxins) that promote disease by interacting with corresponding host sensitivity gene products. SnTox1 was the ...