【摘要】 本文以六个亲本的的双列杂交F，组合产量比较的资料，联系其早代表现，研究各亲本从低世代到高世代产量构成性状中的配合力变化．结果表明：地方品种紫皮产量的一般配合力从低世代到高世代由低转高．而外来品种PF52296则相反，说明产量一般配合力的变化与品种的生态适应性有关．千粒重与穗粒重在低代和高代有相似的趋势．因而就产量而言．用早代的一般配合力效应来判断亲本的优劣存在一定的问题．对亲本的选择应在一般配合力高的基础上再考虑特殊配合力．更多还原

【Abstract】 Six varieties were selected in a 1/2P(P+1)diallel design and the yields of F7 hy brids and their parents were tested. By comparing the results with that of early generations,the variations of combining ability for yield components in F2 and F, were studied. Results showed that the g. c. of local variety Zipi was higher in F7 generation, while introduced variety PF52296 was higher in F2 generation, indicating that the variation of g. c. a of yield was related to the eco logical adaptability of varieties. The combining ability of 1000 -grain-weight and grain weight per head expressed similar tendecy in F2 generation and F7 generation. So it seemms to be prob lematical toestimate parents according to their g. c. a values in early generations. The selectin of parents should be based first on high g. c. a and then on high s. c. a更多还原