Genetic diversity analysis of agronomic traits in 71 local pea germplasms in Guangxi
[Objective]The genetic diversity of agronomic traits in local pea germplasms in Guangxi was analyzed for obtaining excellent re-sources and providing theoretical basis for their efficient utilization.[Method]A total of 71 local pea germplasms in Guangxi were used as ex-perimental materials,and their agronomic traits(10 quality traits and 16 quantitative traits)were determined,and their genetic variation was analyzed,and correlation analysis,principal component analysis,and cluster analysis were carried out.[Result]The variation range of the coefficient of variation for 10 quality traits was 13.07％-47.71％,and the average was 29.16％,and the coefficient of variation for all quality traits was greater than 10.00％.The range of genetic diversity index was 0.13-1.26,and the average was 0.62.The variation range of the coefficient of variation for 16 quantitative traits was 5.78％-61.75％,and the average was 24.07％,and the coefficient of variation for most traits was greater than 10.00％.The range of genetic diversity index variation was 1.73-2.07,and the average was 1.93.Correlation analysis showed that most of the 26 agronomic traits had varying degrees of correlation with each other.Principal compo-nent analysis showed that the cumulative contribution rate of the first 7 principal components of 26 personality traits was 75.621％,which was mainly related to growth period,yield,grain appearance,plant type and pod appearance.Cluster analysis showed that 71 local pea germplasms in Guangxi were mainly divided into two groups(group Ⅰ and group Ⅱ),and Group Ⅰ was further divided into two secondary groups(Ⅰa and Ⅰb).Germplasms in group Ⅰa had the characteristics of high stem,creeping,late maturing,higher yield and higher resistance to powdery mildew.Germplasms in group Ⅰb had the characteristics of more and larger pods,higher yield,smaller grains and higher suscepti-bility to powdery mildew.Germplasms in group Ⅱ had the characteristics of earlier maturity,shorter stem,upright,long pods,lower yield and higher susceptibility to powdery mildew.Fourteen germplasms with excellent traits were screened out,and germplasms 2,40,61 and 67,with high yield and comprehensive resistance to powdery mildew,could be directly promoted and applied.Germplasms with certain ex-cellent agronomic traits such as 5,14,15,41,57,59,66,68 and 71 could be used as parents for the subsequent creation of excellent new pea germplasm.[Conclusion]The 71 local pea germplasms in Guangxi have rich genetic diversity in agronomic traits,and they have the char-acteristics of multiple branches,nodes,longer pods,and more and larger grains.
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