A Field Evaluation of Resistance to Pyricularia oryzae in Rice Genotypes

ABSTRACT: Rice blast, caused by Pyricularia grisea Sacc, has been a continuous threat to rice production. Eight rice genotypes along with two local checks (Nemat and Binam as resistance and susceptible local checks, respectively) were evaluated for resistance to blast at Sari Agricultural Sciences and Natural Resources University, Iran in 2011. The experiments were conducted under field condition. The results of field experiments based on lesion type, panicle blast severity and AUDPC data for leaf and panicle blast showed that B40, Binam and IRBLZT-T genotypes are sensitive and three rice genotypes (IRBLKP-K60, IRBLZ5-CA and Nemat) had the higher level of resistance to leaf and panicle blast. These genotypes could be utilized as donor parents for breeding durable blast resistant varieties. Also FLAGMAN and GAMMA genotypes had the highest panicle infection but significantly had the lower leaf blast.