Estimating genotype × environment interaction and stability parameters for oil and seed meal quality, seed yield and its contributing characters in Indian mustard (Brassica juncea)

Abstract

A study was conducted during 2003–06 to assess the genotype by environment interaction effects and stability parameters for oil and seed meal quality, seed yield and its contributing characters of 25 Indian mustard [Brassica juncea (L.) Czernj. & Cos.] varieties. Pooled analysis of variance indicated highly significant differences for genotypes (G), environment (E) and G × E interaction for oil, protein, glucosinolates, fatty acid profile, seed yield and contributing characters. The environment (linear) was highly significant for all the characters, while the linear component of genotype × environment interaction was highly significant for protein content only. Pooled deviation differed significantly for linoleic; linolenic, erucic acid, glucosinolates, days to maturity, 1000-seed weight and seeds/siliqua, suggesting the genotypes had varying level of stability over the cropping seasons for these characters. Stability parameters indicated that oil and protein content were fairly stable across environments in 14 and 11 varieties, respectively. Only 3 varieties, ‘CS 52’ (protein content, oleic, linoleic, linolenic, eicosenoic and erucic acid) ; ‘Saurab’ (oil content, protein content, oleic, linoleic, linolenic and erucic acid) and ‘Sanjucta Asceh’ (oil content, protein content, saturated fatty acid, oleic, linoleic and erucic acid) were stable for maximum of 6 quality characters. Three varieties (‘Bio 902’, ‘PBR 97’ and ‘PCR 7’) showed stable performance for seed yield over environments. ‘Rohini’ and ‘GM 1’ showed relatively stable maturity duration and 1000-seed weight, respectively over the environments.