Hybrid vigour and combining ability in sunflower, Helianthus annuus L. hybrids involving CMS lines

摘要

Thirty crosses generated from five cytoplasmic male sterile lines of sunflower and six restorers in a line x tester design and their parents were evaluated for general and specific combining ability, variance components and standard heterosis. Predominance of non-additive gene action was observed for all the traits studied, though additive gene action was also found to be operative. The parents DCMS 18, DCMS 5, DSI 15 and DRS 16 were proved to be good general combiners for yield and most of its related characters. Nine crosses namely DCMS 34 x DRS 22, DCMS 18 x DSI 15, DCMS 18 x DSI 9, DCMS 18 x DSI 86, DCMS 24 x DRS 16, DCMS 24 x DRS 22, DCMS 5 x DSI 9, DCMS 5 x DRS 16 and DCMS 12 x DSI 86 had shown higher significant positive sea effects for seedyield/plant. The estimated standard heterosis ranged from -20.32 to 8.80%. Out of 30 combinations, only four crosses (DCMS 18 x DS115, DCMS 18 x DSI 86, DCMS 24 x DRS 16 and DCMS 5 x DRS 16) registered positive significant standard heterosis for seed yield/plant.