Gene effects and genotypes x environment interaction at various growth stages for root characteristics, plant height and seed yield in Indian mustard, Brassicajuncea (L.) Czern & Coss

摘要

Thirty triple test cross families of Indian mustard, Brassica juncea (L.) Czern & Coss., were raised in normal and moisture stress environment to detect and measure the interaction between the environments and the additive dominance and epistatic effects of the genes for root characteristics, plant height and seed yield at various growth stages. Additive as well as dominance gene effects and epistasis were observed for root characteristics, plant height and seed yield except root volume. Additive gene effects were more sensitive to environmental changes than the dominance gene effects. The additive x dominance 'j' and additive x additive 'I' type epistasis was relatively more sensitive to environmental differences than the additive 'i' type of epistasis. Thus, the hybrid Indian mustard would be more stable in varying environments corresponding to homozygous variety. Therefore, the commercial hybrids of such genetic make up need to be exploited on priority basis in stabilizing the unstable productivity.