GENOTYPE AND ENVIRONMENT INTERACTIONS IN YIELD CONTRIBUTING CHARACTERS OF MUSTARD (Brassica rapa L.)

Abstract

The experiment was conducted in the experimental field of Sher-e-Bangla Agricultural University, Dhaka during October, 2017 to April, 2018. The objective of this study was to assess the genotype and environment interactions for yield and yield contributing characters of mustard varieties grown in Bangladesh through the AMMI (additive main effects and multiplicative interaction) model. The study comprised of eleven (11) mustard varieties of Brassica rapa released by BARI and BINA and three (3) environments laid out in randomized complete block (RCBD) design with three replications. The environments were three sowing times viz., optimum (Env-1), late (Env-2) and very late (Env-3) sowings of eleven mustard varieties. The results of combined analysis of variance (ANOVA) revealed significant differences between genotypes and environments as main effects. Genotype and environment interactions both linear and non-linear components were highly significant for most of the parameters except number of seeds per siliqua and hundred seed weight. The results also suggested that Env-3 was poor and Env-1 and Env-2 were found rich and favorable for mustard production. The IPCA1 (First Interaction Principal Component Axis) scores of a genotypes in the AMMI analysis used as an indication of the stability or adaptation over environments. The greater the IPCA1 scores indicated the better adaptation of a genotype to certain environments. Hence, considering the IPCA1 scores BARI Sharisha-9, BARI Sharisha-15, Maghi and Improved Tori were low yielding and unstable, while BARI Sharisha-6, BARI Sharisha-17 and BINA Sharisha-9 were shown high yielding but unstable genotypes. Again, Env-1 was found as rich environment where, BARI Sharisha-17, BINA Sharisha-9 were shown highly responsive to the environment (Env-1). BARI Sharisha-12 was found intermediate yielding and stable variety. As a whole, Sonali Sharisha-75 and BINA Sharisha-10 were found as high yielding and stable varieties and Env-1 and Env-2 were more favorable for the mustard production.