Modern Japanese rice cultivars often carry a nonautonomous retrotransposon-insertion mutation at the pathogenesis-related 1b protein gene locus causing reduced resistance to Pyricularia oryzae.

Abstract excerpt

In Japan, rice cultivars with high eating quality such as Koshihikari are often highly susceptible to the fungus Pyricularia oryzae, which causes rice blast, the most serious disease of rice; however, little is known about the genetic factors leading to this high susceptibility to blast. Here, after our initial inoculations with P. oryzae, the expression of the pathogenesis-related protein 1b (PR1b) gene was not...

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