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Jao Hom Nin (JHN) is a Thai rice variety with broad-spectrum resistant against rice blast fungus. JHN contains two rice blast resistant genes, Pish and Pik , located on chromosome 1 and on chromosome 11, respectively. To understand the blast resistance in JHN, the study of the defense mechanism related to the Pish and Pik genes is crucial. This study aimed to dissect defense response genes between the Pish and Pik genes using the RNA-seq technique. Differentially expressed genes (DEGs) of Pish and Pik backcross inbred lines were identified between 0 and 24 h after inoculation with rice blast spore suspension. The results showed that 1248 and 858 DEGs were unique to the Pish and Pik lines, respectively. The wall-associated kinase gene was unique to the Pish line and the zinc-finger-containing protein gene was unique to the Pik line. Pathogenicity-related proteins PR-4 and PR-10 were commonly found in both Pish and Pik lines. Moreover, DEGs functionally categorized in brassinosteriod, jasmonic acid, and salicylic acid pathways were detected in both Pish and Pik lines. These unique and shared genes in the Pish and Pik rice blast defense responses will help to dissect the mechanisms of plant defense and facilitate rice blast breeding programs.

Transcriptome Comparison of Defense Responses in the Rice Variety ‘Jao Hom Nin’ Regarding Two Blast Resistant Genes, Pish and Pik