新质源(CMS-FA)杂交稻产量相关性状的相关性分析

以新质源(CMS-FA)杂交稻遗传系统的5个不育系和5个恢复系进行不完全双列杂交,采用加性一显性遗传模型和MINQUE (1)法,对新质源(CMS-FA)杂交稻产量相关性状进行多种相关分析.结果表明,新质源(CMS-FA)杂交稻产量相关性状间的相关性为；株高与结实率,剑叶长与生育期、结实率,生育期与每穗实粒数,结实率与千粒重,千粒重与单株产量等性状之间的遗传相关以基因的加性正相关为主;单株穗数与株高、剑叶长、每穗总粒数、每穗实粒数、结实率,千粒重与每穗总粒数等性状之间的遗传相关以基因的加性负相关为主.株高与穗长、剑叶长、每穗总粒数、千粒重,穗长与每穗总粒数,每穗实粒数、单株产量等性状之间具有显著或极显著的显性相关.利用加性相关为主的性状进行间接选择可取得较好的育种效果.

Correlations Among Yield-related Traits of CMS-FA Hybrid Rice

Using 5 CMS-FA sterile lines as female parents and 5 corresponding restorers as male parents,25 crosses were bred with the incomplete diallel cross design for the experiment.Their parents and F1 generations were planted to generate data on the yield-related traits.By the additive-dominant model and MINQUE(1) method,the genetic correlations among 10 yield-related traits of CMS-FA hybrid rice were analyzed.The results showed significant correlations among the traits.The genetic correlations between the plant height(PH) and seed-set percent(SSP),between the flag-leaf length(FLL) and growth duration(GD) or SSP,between GD and filled grain number per panicle(FGNPP),between SSP and 1000-grain-weight(TGW),and between TGW and yield per plant(YPP) were basically positive and additive.Those between the panicle number per plant(PNPP) and PH,between FLL,total grain number per plant(TGNPP),FGNPP,SSP,and between TGW and TGNPP were mainly negative and additive.There were also significant or very significant positive dominance correlations between traits of PH and panicle length(PL),between FLL,TGNPP,TGW,PL and TGNPP,FGNPP,YPP.Consequently,in breeding,it would be advisable to choose the traits that showed high additive correlations.