Abstract

Rice (Oryzae sativa L.) is one of the most important cereal food security crops for an ever-increasing population globally. However, brown spot reduced its production and productivity. This study was conducted to screen rice resistant lowland rice pipelines under natural infestation. A total of 49 lines were screened for their resistance against brown spot in the field with a simple lattice design including two susceptible and two resistant varieties. Sixteen genotypes showed highly resistant reactions for Bipolaris oryzae, and six of them including susceptible checks were highly susceptible. Thus, Scrid037-4-2-2-5-2 (8693 kg/ha), Shaga (8184.50 kg/ha), scrid019-1-1-1-1-2 (7345.50 kg/ha), Fengdao 23 (7126.7 kg/ ha), and FOFIFA 167 (6895.60 kg/ha) genotypes were highly resistant, gave maximum yield and recommended in the management of Bipolaris oryzae, and finally used as sources of resistance for further breeding programs. However, inherent resistance genes of the above lines and the pathogen genetic characteristics should also be identified.