Evaluation of a novel molecular marker associated with the tan spot disease response in wheat
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After nearly 40 years of DNA molecular marker development in plant breeding, the wheat research community has amassed an extensive collection of molecular markers which have been widely and successfully used for selection of agronomic, physiological and disease resistance traits in wheat breeding programs. Tan spot is a major fungal disease of wheat and a significant global economic challenge and is caused by the necrotrophic fungal pathogen Pyrenophora tritici-repentis (Ptr). Here, the potential for using a PCR-based marker (Ta1AS3422) present on the short arm of wheat chromosome 1A, was evaluated for effectiveness in distinguishing tan spot disease susceptibility. The marker was initially screened against 40 commercial Australian hexaploid wheat varieties, and those that amplified the marker had an overall lower disease score (2.8±0.7 for seedlings and 2.4±0.4 for plants at the tillering stage), compared to those lacking the marker which exhibited a higher disease score (3.6±0.8 for both growth stages). The potential of Ta1AS3422 as a marker for the tan spot disease response was further assessed against a panel of 100 commercial Australian hexaploid wheat varieties. A significant association was observed between marker absence/presence and tan spot disease rating (Pearson’s chi-squared test, 2 (6) = 20.53, p = 0.002), with absence of Ta1AS3422 associated with susceptibility. This simple and cost-effective PCR-based marker may be useful for varietal improvement against tan spot, although further work is required to validate its effectiveness.
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Genetic analysis of wheat sensitivity to the ToxB fungal effector from Pyrenophora tritici-repentis, the causal agent of tan spotCorsi, B.; Percival-Alwyn, L.; Downie, R.C.; Venturini, L.; Iagallo, Elyce ; Campos Mantello, C.; McCormick-Barnes, C.; See, Pao Theen ; Oliver, Richard ; Moffat, Caroline ; Cockram, J. (2020)Key message: Genetic mapping of sensitivity to the Pyrenophora tritici-repentis effector ToxB allowed development of a diagnostic genetic marker, and investigation of wheat pedigrees allowed transmission of sensitive ...
Dinglasan, E.G.; Peressini, T.; Marathamuthu, Kalai ; See, Pao Theen ; Snyman, L.; Platz, G.; Godwin, I.; Voss-Fels, K.P.; Moffat, Caroline ; Hickey, L.T. (2021)Key message: QTL mapping identified key genomic regions associated with adult-plant resistance to tan spot, which are effective even in the presence of the sensitivity gene Tsn1, thus serving as a new genetic solution to ...
Antoni, E.; Rybak, K.; Tucker, Madeline; Hane, J.; Solomon, P.; Drenth, A.; Shanka, M.; Oliver, Richard (2010)Pyrenophora tritici-repentis, the causal organism of the necrotrophic foliar wheat disease tan spot [alsoknown as yellow (leaf) spot in Australia] is an important disease in Australia and in many parts of the world. ...