Genetic Diversity of 49 Tea Germplasms Classified by Leaf Phenotypes
[Objective]For resource conservation,a collection of tea germplasms with desirable agronomic traits was taxonomically organized based on leaf phenotypes.[Method]Differentiated leaf phenotypes of 49 selected tea germplasms were examined and analyzed for genetic diversity,principal components,species clustering,and trait correlations.[Result]The genetic diversity indexes of 18 leaf phenotypic traits of the 49 germplasms ranged from 0.31 to 2.15 with an average variation coefficient of 29.4%.The principal components were the length,area,length/width ratio,texture,cross section,and upper surface of leaf that cumulatively made up a contribution rate of 69.73%.It agreed with the result of a cluster analysis which divided the germplasms into 4 distinctive categories.Among the traits,leaf length significantly correlated to the width,area,and vein number;leaf size to the length,width,area,and vein number;and leaf tip inversely to the blade and length/width ratio.In general,the bigger the size and the more lanceolate the shape of the leaves,the more numerous the veins on them;and the greater length/width ratio,the more likely the shape with a sharp and tapering point.[Conclusion]The selected tea germplasms were genetically diverse.The 6 primary leaf phenotypic traits identified in this study satisfactorily differentiated between the cultivars.
万方数据
维普
