Heterosis and combining ability studies in upland cotton for yield characters
Ten Gossypium hirsutum lines tolerant to jassids were selected as donors along with three standard varieties viz., MCU 5, MCU 7, MCU 12 for crossing programme. This study indicated the predominance of non additive gene effects for all the yield and yield contributing characters which signifies the scope for exploitation of heterosis. Among the lines, DHY 286, Badnawar 1 and SVPR 2 were found to be good general combiners for single plant yield. Among the jassid resistant parents, DHY 286 was found to possess more favourable genes for number of bolls per plant, boll weight, single plant yield and seed index. The highly resistant parent KC 2 was observed as good general combiner for bolls per plant and this parent can be used in breeding programme for improving yield coupled with resistance. The tester MCU 5 is a good general combiner for yield contributing traits. By hybridizing the resistant genotypes with MCU 5, favourable gene combinations could be accomplished for the yield and yield contributing characters. The hybrids showing high per se performance for yield, DHY 286 x MCU 5, Badnawar 1 x MCU 5, Badnawar 1 x MCU 7 and Badnawar 1 x MCU 12 also showed resistance to jassids and deserve further exploitation.
Cotton, heterosis, combining ability, per se performance, jassid resistance
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