Screening of Rice Genotypes for Bacterial Blight of Rice under Artificial Inoculation in South Gujarat Conditions

Abstract— The study was conducted at the Navsari Agricultural University’s main rice research center in Gujarat, India, during the kharif season (July–November 2023) to assess the resistance of rice genotypes to bacterial blight using an artificial inoculation method. Thirty rice genotypes were evaluated along with two known susceptible varieties viz., GR-11 and TN-1, using the clip inoculation technique under field conditions. Among them, four genotypes viz., NVSR-996, NVSR-1065, NVSR-1127 and ISM showed moderate resistance. Fifteen genotypes viz., NVSR-936, NVSR-938, NVSR-941, NVSR-950, NVSR-951, NVSR-942, NVSR-1002, NVSR-1003, NVSR-1005, NVSR-1048, NVSR-1111, NVSR-983, NVSR-1130, NVSR-1064, and GNR-3 were found moderately susceptible. Eleven genotypes viz., NVSR-939, NVSR-952, NVSR-997, NVSR-956, NVSR-1001, NVSR-1007, NVSR-1031, NVSR-1033, NVSR-1128, NVSR-964, and NVSR-1052 were found to be susceptible. Whereas, the susceptible checks GR-11 and TN-1 were found highly susceptible against bacterial blight of rice. Among the screened genotypes, NVSR-939 exhibited the highest disease intensity (48.60%) followed by NVSR-1128 (48.57%) and NVSR-952 (46.20%). In contrast, ISM had the lowest disease intensity (7.28%) followed by NVSR-1065 (8.20%) and NVSR-996 (8.60%), respectively. The international susceptible check TN-1 showed a disease intensity of 76.00 per cent and the local check GR-11 showed 68.57 per cent, both indicating high susceptibility to bacterial blight of rice.