甘蔗实生苗净光合速率与经济性状配合力分析

Combining Ability Analysis of Photosynthetic Rate and Economic Traits of Seedling Sugarcane at Nursery Stage

甘蔗7个亲本按3×4不完全双列杂交(NCⅡ)遗传设计配制成12个组合,实生苗的净光合速率与经济性状的遗传方差、一般配合力(gca)和特殊配合力(sca)效应分析结果表明:株高和单茎重的遗传主要受母本加性基因效应控制,锤度的遗传主要受父本加性基因控制,而有效茎和假植期净光合速率的遗传主要受非加性基因效应所制约;CP72-1210作为母本,糖分配合力高,且能把高糖特性传递给后代,其后代综合性状较好。Zhan74-141为父本,产量性状的配合力大,其杂交后代表现高产;Gui73-167为父本,其杂交后代表现高糖。根据配合力总效应,综合表现好的组合有“ROC”1×Gui73-167,CP72-1210×Ya90-31,CP72-1210×Zhan74-141。

Seven parents of sugarcane were used to develop 12 crosses according to 3 ×4 incomplete diallel cross genetic design. The effects of genetic variance, general combination ability and special combination ability of the economic traits on photosynthetic rate （Pn） were estimated in the parents and their crosses at seedling stage. The results showed that plant height and single stalk weight of sugarcane were controlled primarily by female additive gene, and that Brix was mainly controlled by male additive gene, while the stalk number and Pn in provisional planting stage were controlled primarily by non-additive gene. CP72-1210, when used as a female parent, displayed a high combining ability and inherited the high sucrose content trait to its progenies. Zhan74-141 was a good male with a good combining ability of high yield, and its progenies showed high yield. Gui73-167 used as a male parent produced its progenies with high sucrose content. According to the total combining abilities, the crosses having better overall performances were found to be ＂ROC＂ 1 ×Gui73 - 167, CP72-1210 ×YA90 -31, and CP72-1210 × Zhan74-141.