Genetic Diversity Analysis of the Main Agronomic Traits in Asiatic Cotton
[Objective]In order to provide references for genetic improvement and germplasm utilization in cotton,the variation,correlation,principal component and cluster of seven agronomic traits and five fiber quality traits were analyzed for 150 asiatic cotton germplasm resources.[Method]In this experiment,150 Asian cotton germplasm resources were selected and planted in the experimental field using a random block design.12 traits,including plant height,first branch length,fruit branch number per plant,boll number per plant,fruit branch position,boll weight,lint percentage,upper half mean length,regularity degree,fiber strength,micronaire value,elongation ratio were investigated during the whole growth period;the variation,correlation,principal component and cluster analysis were carried out.[Result]The data analysis showed that this collection represented an abundant genetic diversity.Twelve agronomic traits showed different levels of genetic variation(lint percentage,29.2%;boll number per plant,23.0%;first branch length,22.6%;boll weight,19.8%;first branch position,15.6%;plant height,15.5%;fruit branch number per plant,10.0%;micronaire value,7.6%;upper half mean length,6.4%;elongation ratio,5.7%;fiber strength,4.4% and regularity degree,2.3%).The plant height was positively correlated with first branch length,fruit branch number per plant,boll number per plant,first branch position and boll weight;the first branch length was positively correlated with boll number per plant,lint percentage and boll weight;the branch number per plant was positively correlated with boll number per plant;the boll weight was positively correlated with lint percentage;the lint percentage was positively correlated with elongation ratio;the upper half mean length was negatively cor-related with fiber strength.The cumulative contribution of the top five principal factors reached 64.536% in the principal component analysis.The first principal factor was mainly related to fiber quality;the second was mainly related to boll number per plant;the third and fourth was mainly related to fruit branch number per plant;and the fifth was mainly related to fruit branch position.Cluster analysis classified 150 cotton germplasms into four groups.Therefore,the cotton resources of the first and fourth cluster could be used as materials to improve the lint per-centage of cotton.The Jiangsu Changshu Jijiaomian and Leye Luoxizhongmian 1-3 were most representative resources,respectively.The cot-ton resources of the second and third cluster could be used to improve the cotton architecture.The Henan Shangqiu Huizi and Shandong Huimin Depingxian Yiwohou were most representative materials,respectively.[Conclusion]This study combined with multiple indexes to comprehensively evaluate cotton germplasm resources,which could provide theoretical basis for the breeding of excellent varieties in cotton breeding.
万方数据
维普
