Combining ability analysis for seedyield, and its components in Indian mustard [Brassica juncea (L.) Czern & Coss.]

Combining ability analysis for seedyield, and its components in Indian mustard [Brassica juncea (L.) Czern & Coss.]

2003

A:PS

A set of 8 x 8 diallel cross, excluding reciprocals, of Indian mustard, along with parents (JMM 947-2-9, Kranti, RW-2-2, BIOYSR, NDR 8501, DOMO, PHR-2 and Ornamental Rai), were evaluated under two sets of environments, i.e. under optimum fertilizer level (80:40:40 kg NPK/ha) and early sowing (E1) and under low fertilizer level (40:20:20 kg NPK/ha) and late sowing (E2), during rabi 1997-98. Observations were recorded for days to first flowering, days to 50% flowering, plant height, length of main shoot, number of siliquae on main shoot, seed yield per plant and oil content, and subjected to combining ability analysis. Significant estimates of mean squares due to general combining ability (gca) and specific combining ability (sca) effects for all the traits were recorded from pooled analysis of variance, indicating the importance of both additive and non-additive genetic variances in the inheritance of these traits. The interactions of gca and sca with the environment were significant for all the traits, except for gca x environment interaction for number of siliquae on main shoot. The estimates of gca effects on the basis of pooled analysis revealed that the national control cultivar, Kranti, displayed greater potential as good general combiner for all the traits. BIOYSR and NDR 8501 also exhibited desirable gca effects for yield, number of siliquae on main shoot, and days to first flowering and 50% flowering. Based on per se performance and gca, RW-2-2, Kranti and PHR-2 were identified as potential parents for early flowering, high seed yield and high number of siliquae on main shoot, respectively. The 12 crosses showed positive and significant sca effect for seed yield. JMM 947-2-9 x Ornamental Rai, BIOYSR x Domo and NDR 8501 x Ornamental Rai were the best cross combinations for early flowering and oil content. The crosses JMM 947-2-9 x Ornamental rai, RW-2-2 x BIOYSR, RW-2-2 x Domo and PHR2 x Ornamental Rai showed highly significant negative sca effectsfor plant height. Comprehensive examination of 8 crosses revealed a close association between number of siliquae on main shoot and seed yield per plant.

v.63(1):83-84, INDIAN JOURNAL OF GENETICS AND PLANT BREEDING

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