Vol. 1, Issue 2, Part D (2015)

This study was cried out during the years 1997-98 and 1998-99 in Rabi season on research farm of the Brahmanand Mahavidyalya Rath, Hamirpur UP, India. Data were recorded and analysed. Three hybrid combinations namely CSR 1020 x CSR 1102, CSR 1014 x CSR 1066 and CSR 1020 x CSR 1027 showed significant and desirable SCA effects for seed yield. These crosses also showed highest per se performance for days to flowering, number of secondary branches per plant, number of siliquae per main shoot, seeds per siliqua and oil content respectively. It clearly indicated the involvement of additive and additive interaction effects.

Crosses CSR 1118 x CSR 1104, CSR 1082 x CSR 1025, CSR 1082 x CSR 1102, CSR 1014 x CSR 1102 and CSR 1066 x CSR 1104 in F1; CSR 1088 x CSR 1025, CSR 1088 x CSR 1082, CSR 1014, x CSR 1082, CSR 1020 x CSR 1118, CSR 1020 x CSR 106 and CSR 1088 x CSR 1014 in F2 exhibited significant and desirable SCA effects involving one parent with desirable GCA effects and other parent with undesirable GCA effects, which means high x low general combiners. The combination which possessed high SCA effects with one good and with one poor combiner is the indicative of the presence of dominance and epistatic nature of gene effects. Such cross could produce desirable transgressive segregants.

Two crosses in F2 revealed significant and desirable SCA effects when both the parents involved in the combination expressed GCA effects (Low x Low) general combiners. These combinations were CSR 1014 x CSR 1066 and CSR 1066 x CSR 1102. Such hybrid combinations are produced due to non-additive gene effects and as such these could not be exploited in self-pollinated crops such as Indian mustard.