Expression of the pathogenesis related proteins, NH-1, PAL, and lipoxygenase in the iranian Tarom and Khazar rice cultivars, in reaction to Rhizoctonia solani - the causal agent of rice sheath blight
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Department of Plant Protection, Sari Agricultural Sciences and Natural Resources University, Mazandaran, Sari, P.O. BOX 578, Iran
Submission date: 2013-03-30
Acceptance date: 2014-01-20
Corresponding author
Mohammad Sayari
Department of Plant Protection, Sari Agricultural Sciences and Natural Resources University, Mazandaran, Sari, P.O. BOX 578, Iran
Journal of Plant Protection Research 2014;54(1):36-43
Pathogenesis related (PR) genes of rice are among the most important defense genes in the interaction of rice with pathogens. In this study, the role of NH-1, several PR genes, phenylalanine ammonia-lyase (PAL), and lipoxygenase in the defense responses of rice against Rhizoctonia solani, the causal agent of rice sheath blight disease, was evaluated. The Tarom and Khazar cultivars (cvs), as resistant and susceptible genotypes, respectively, were used. The expression rate of defense genes in two-week-old seedlings inoculated with a virulent isolate of R. solani AG-I-1 A was investigated. The lesions in the Tarom cv were less than half the size of those on the Khazar cv. The expression scripts of the genes were calculated by quantative Real-Time PCR (RT-PCR). Results showed that the expression rate of all genes in the resistant cultivar was higher than that of the susceptible genotype, post inoculation. Analysis of data by the t-Student test also indicated significant differences in the expression level of the genes between Khazar and Tarom. The results of this study suggest that the investigated genes are involved in the resistance responses of rice against the sheath blight agent. For the first time, the induction of PR-5, PR-9, PR-10, PR-12, PR-13, and NH-1 was observed in this study in the resistant and susceptible Iranian cultivars of rice following attacks by R. solani.
The authors have declared that no conflict of interests exist.
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