Assessment of disease tolerance in Indian mustard [Brassica juncea (L.) Czern & Coss] using effective selection criteria.

摘要

Eleven elite diverse genotypes/varieties of Indian mustard [Brassica juncea (L.) Czern & Coss] were crossed with three testers in set I. In set 11, seven elite diverse genotypes varieties were crossed with three testers. These genotypes were raised under two environments, normal and late sown conditions. The inoculation for white rust was performed. Observations were recorded for quantitative characters in both the environments. The estimates of stress intensity were found to be important to screen different genotypes for their terminal stress tolerance. The family PCR 9301 x RH 9911 recorded significantly higher mean productivity and retained higher potential yield with low stress tolerance and found suitable for normal sown conditions. The crosses RH 0003 x F₁ and RH 0003 and JMM 937 had considerable level of stress tolerance. It was also observed that smaller the value of stress susceptibility index, greater is the stress tolerance. The families showing lowest geometric mean productivity should be avoided for stress environment. The higher value of stress tolerance index revealed the higher stress tolerance and yield potential. Therefore, the genotypes thus developed seem to be promising for enhancing yield as well as tolerance to late sowing and disease tolerance.