CP系列甘蔗亲本及杂交组合育种潜力分析

Analysis on breeding potential of series of CP parents and their cross combinations in sugarcane

选用15个CP系列甘蔗亲本与国内育成的21个亲本选配的42个杂交组合为材料,借助R软件对F1群体的株高、茎径、锤度、丛有效茎、丛重、丛含糖量等主要性状的变异系数、遗传力、配合力及经济育种(遗传)值进行分析。结果表明:6个性状的平均变异系数皆表现为表型变异系数(PCV)大于遗传变异系数(GCV),其中丛有效茎、丛重及丛含糖量变异较大,株高、茎径及锤度变异较小;平均遗传力表现为组合最高(42.53%),其次是母本(34.35%),最后是父本(27.07%);除株高、茎径受父本影响大于母本外,其余4个性状皆是受母本影响较大;除组合的锤度、丛有效茎介于双亲之间外,其余4个性状均表现为组合高于双亲;综合一般配合力(GCA)和经济育种值(EBV)分析,表现较好的CP亲本有Ho CP95–988(父母本)、CP72–1210(母本)、CP85–1491(母本)、Ho CP92–648(母本)、CP72–2086(父本)、CP84–1198(父本)、CP93–1382(父本)、CP94–1100(父本);综合特殊配合力(SCA)和经济遗传值(EGV)分析,表现较好的组合有CP72–1210×ROC24、CP85–1491×ROC22、Ho CP92–648×桂糖92–66、福农95–1702×Ho CP95–988、粤糖91–976×Ho CP95–988。

42cross combinations,which come from the crossing with15parents of CP series and21varieties clones developed in China,were used as materials.The coefficient of variation(CV),heritability,combining ability and economic breeding or genetic values of the main characters,such as plant height,stalk diameter,brix,millable stalk per stool,cluster weight,sugar yield per stool of F1populations were analyzed by R software.The results showed that:the coefficients of phenotype variation(PCV)were larger than the coefficients of genetic variation(GCV)in the coefficients of average variation of six traits,and the variations of millable stalk per stool,cluster weight and sugar yield per stool were larger than the variations of plant height,stalk diameter and brix;the average heritability of six traits was the highest(42.53%)in the combinations,34.35%in female parent and27.07%in male;all traits were more affected by female except plant height and stalk diameter;all traits of combinations were higher than those of their parents except the traits of brix and millable stalk per stool,which were between the male and the female.The parents of CP,HoCP95–988(as female and male),CP72–1210(as female),CP85–1491(as female),HoCP92–648(as female),CP72–2086(as male),CP84–1198(as male),CP93–1382(as male),CP94–1100(as male)had better general combining ability(GCA)and economic breeding value(EBV)than the others.The combinations,CP72–1210×ROC24,CP85–1491×ROC22,HoCP92–648×Guitang92–66,Funong95–1702×HoCP95–988,Yuetang91–976×HoCP95–988had better special combining ability(SCA)and economic genetic value(EGV)than the others.