Morpho-physiological determinants of yield under water stress condition in Indian mustard (Brassica juncea (L.) Czern & Coss.)

摘要

Screening of 25 newly evolved and released varieties of Indian mustard under dryland conditions revealed wide genetic variation for primary and secondary branches, dry root weight, siliquae on main stem, root pulling strength, and seed yield. Genetic variation was low for days to flowering, 1000-seed weight, plant height, harvest index and number of seeds per siliqua. Broad-sense heritability was highest for days to flowering, 1000-seed weight and yield. Seed yield had high genotypic and phenotypiccorrelations with number of primary and secondary branches, and number of siliquae on the main stem. Number of siliquae on the main stem was positively correlated with reproductive period, and number of primary and secondary branches. Root pulling strength, dry root weight, harvest index, 1000-seed weight and days to flowering had poor relationships with the other characters. Number of primary branches, reproductive period and days to flowering directly effected seed yield.