广西板栗种质资源坚果性状综合评价OA

In order to provide scientific basis for selection of high-quality chestnut varieties in Guangxi,nut phenotypic traits,starch contents,soluble sugar contents and reducing sugar contents of 39 chestnut germplasm resources in Guangxi were measured.Correlations among these traits were analyzed.Cluster analysis was em-ployed for classification.Principal component analysis was employed to screen chestnut germplasm resources with excellent comprehensive traits.Results showed that coefficients of variation of eight trait indexes among 39 chestnut germplasm resources ranged from 12.90%to 53.21%,indicating significant potential for improvement.Single kernel weight had extremely significant positive correlation with transverse diameter and significant posi-tive correlation with longitudinal diameter.Longitudinal diameter had significant negative correlation with trans-verse diameter and significant positive correlation with amylopectin content.Total starch content had extremely significant positive correlations with contents of amylose and amylopectin.Amylose content had extremely sig-nificant positive correlations with contents of amylopectin and soluble sugar.Cluster analysis showed that GroupⅠ(Lanyou and Lanhua)exhibited relatively higher means for multiple traits,which were suitable as priority candidates for culinary use.Ten chestnut germplasm resources with higher comprehensive scores were selected,namely Lanyou,Long'an 1,Lanhua,Donglan 7,Nanning 3,Nandan 2,Fengshan 4,Tian'e 4,Tian'e 1 and Nan-ning 5,which could be used for improvement and application as elite varieties.