【摘要】 籼×粳、籼×爪和爪×粳的不完全双列杂交F1的平均小穗不育率分别为49.4％、36.1％、38.9％,爪哇类型表现为籼粳的中间类型。爪哇类型参与的杂交组合平均小穗不育率最低(37.9％),籼型和粳型参与的杂交组合小穗不育率相近,分别为44.9％和44.2％。亚种间杂种绝大多数农艺性状都测定有杂种优势。性状杂种优势与杂种小穗不育率的相关不显著,表明水稻亚种间杂交并非亲缘关系愈远性状杂种优势愈强,杂种优势和远缘品种间分化程度取决于相对独市的基因系统。讨论了水稻杂种优势利用存在的问题及改进杂种优势利用的策略。更多还原

【Abstract】 In three types of incomplete diallel sets, e. g indica X japonica, indica X javanica, javanica Xjaponica, mean hybrid spikelet sterility was respectively, 49.4%, 36.1%, and 39.8%, which indicated that javanica was an intermediate type betwween indeca and japonica. Heterosis was detected for most of characters of inter—subspecific hybrids. No correlation was existed between the spikelet sterility and the heterosis, revealling that the heterosis and subspecies differentiation were under the control of independent gene systens. The breeding strategy of hterosis was discussed.更多还原