【摘要】 选用9个籼型三系杂交水稻亲本(5个不育系和4个恢复系),采用p×q不完全双列杂交(NCⅡ)对14个产量及其相关性状的配合力进行分析。结果表明:(1)所有考查性状的一般配合力和特殊配合力均达显著或极显著水平。其中播始历期、株高、每穗总粒数、着粒密度、单株草重、谷草比、生物产量等性状以基因加性效应为主,有效穗、结实率、千粒重等性状则以基因的非加性效应为主。(2)考查的多数性状受恢复系的影响要比受不育系的影响大,仅千粒重受不育系的影响较大。(3)产量及其相关性状的一般配合力和特殊配合力不育系以金23A和中9A较好,恢复系以R121和R120较好。(4)亲本各性状一般配合力与特殊配合力之间没有明显的对应关系,一般配合力与亲本自身的表型值则有一定的相关性,说明在育种研究中必须注意亲本自身性状的改良。更多还原

【Abstract】 Nine parents of three-line indica rice,including 5 sterile lines and 4 restoring lines,were chosen to analyze the combining ability of 14 yield characters and related characters by the way of p×q incomplete diallele cross(NCⅡ)design. The results showed:(1)both general combining ability(GCA)and specific combining ability(SCA) of all the characters tested were highly significant level;the additive variation was principal for the characters of days to initial heading(DIH),plant height(PH),spikelets per panicle(SPP),density of spikelet setting(DSS),grass weight of single plant(GWSP),ratio of grain via grass(RGG),biological yield of single plant(BYSP),while the non additive variation was greater for the characters of effective panicle(EP),seed-setting rate(SSR),1000-grain weight(1000GW);(2)most characters were more greatly influenced by restorer line than by sterile line,there was a relatively greater effect of sterile line on 1000-grain weight(1000GW);(3)the yield characters and related characters of GCA and SCA were greater for Jin 23A,Zhong 9A in sterile line and R121,R120 in restoring lines;(4)effects of various characters on the GCA and SCA were not significantly related to each other,which suggested that it is essential to pay attention to improvement of the parent characters.更多还原