【摘要】 采用7个芽黄品系与8个常规品种(系)进行NCⅡ交配设计,连续两年(1986～1987)测定56个组合在17个农艺性状上的杂种优势和配合力;测定不同地点和不同年份各芽黄品系的天然异交率和辅助授粉异交率。试验结果表明:芽黄品系与常规品种(系)杂交,其杂种有明显的杂种优势,就中亲优势和高亲优势而论,产量性状优势最大,产量因素和早熟性次之,纤维品质性状的优势也明显存在。在516个组合中有8个组合皮棉产量高于对照,其中(湖北芽黄×PD9364)组合尤为突出。经亲本的配合力分析发现,湖北芽黄和彭泽芽黄为较好的芽黄亲本。7个芽黄品系的天然异交率两地平均为16.63％,不去雄辅助授粉异交率两年平均为64.40％,为杂种优势利用寻求经济、简便和有效的制种方法提供了可能性。更多还原

【Abstract】 56 crosses were made between 7 virescent strains and 8 commercial varieties in upland cotton with NC Ⅱ mating design.From 56 combinations （F₁）, the heterosis percentage and combining ability effects of 17 agronomic traits were evaluated for two years. Estimates of mean midparent heterosis and mean highparent heterosis over years were greatest for seed cotton yield （28.08% and 15.97%）. 8 better combinations than the commercial check variety （Simian No.2） were selected from 56 combinations （F₁）. F₁ of Hubei virescent×PD9364 showed the highest lint and seed cotton yield, better fibre quality and earlier maturity than the check. Through the analysis of combining ability, two good virescent parents which had high GCA effects, were selected.The natural crossing percentage and the crossing percentage of supplementary pollination without emasculation were also tested in different years, locations and with virescent strains. The average natural crossing percentage of 7 virescent strains at two locations was 16.63%. The average crossing percentage obtaind by supplementary pollination without emasculation for two years was 64.40%.The results suggested that virescent strains may be used in producing hybrid seeds of cotton as feasiable and economic approach.更多还原