July 7, 2019  |  

Evolution of the wheat blast fungus through functional losses in a host specificity determinant.

Authors: Inoue, Yoshihiro and Vy, Trinh T P and Yoshida, Kentaro and Asano, Hokuto and Mitsuoka, Chikako and Asuke, Soichiro and Anh, Vu L and Cumagun, Christian J R and Chuma, Izumi and Terauchi, Ryohei and Kato, Kenji and Mitchell, Thomas and Valent, Barbara and Farman, Mark and Tosa, Yukio

Wheat blast first emerged in Brazil in the mid-1980s and has recently caused heavy crop losses in Asia. Here we show how this devastating pathogen evolved in Brazil. Genetic analysis of host species determinants in the blast fungus resulted in the cloning of avirulence genes PWT3 and PWT4, whose gene products elicit defense in wheat cultivars containing the corresponding resistance genes Rwt3 and Rwt4 Studies on avirulence and resistance gene distributions, together with historical data on wheat cultivation in Brazil, suggest that wheat blast emerged due to widespread deployment of rwt3 wheat (susceptible to Lolium isolates), followed by the loss of function of PWT3 This implies that the rwt3 wheat served as a springboard for the host jump to common wheat. Copyright © 2017, American Association for the Advancement of Science.

Journal: Science
DOI: 10.1126/science.aam9654
Year: 2017

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