Genetic variation analysis and comprehensive evaluation on main photosynthetic traits and agronomic traits of Mesona chinensis germplasm resources
[Objective]The genetic variation analysis and comprehensive evaluation of the main photosynthetic and agronomic traits of Mesona chinensis germplasm resources were carried out to provide a reference for M.chinensis germplasm resources screening and variety breeding.[Method]The main photosynthetic and agronomic traits of 8 M.chinensis germplasms from different regions were determined.Genetic varia-tion analysis,principal component analysis and cluster analysis were used to analyze and evaluate the genetic variation of 8 M.chinensis germplasms from different regions.[Result]For the 8 M.chinensis germplasms,the coefficient of variation of photosynthetic characters was 6.53％-26.94％,and the general heritability was 48.47％-99.14％,the variation coefficient of agronomic traits was 16.26％-36.44％,and the general heritability was 69.85％-99.63％.Three principal components were extracted from 20 traits of M.chinensis by principal component analysis,and their cumulative contribution was 89.145％,which explained most of the information of 20 traits.The first principal component was related to relative chlorophyll content(SPAD),intercellular CO2 concentration(Ci),transpiration rate(Tr),water utilization rate(WUE),stomatal limit value(Ls),the second principal component was related to chlorophyll content,carotenoid content and net photosynthetic rate(Pn),and the third principal component was related to leaf width,leaf area and stem diameter.X2,X3 and X4 were selected as excellent M.chinensis germplasm.By cluster analysis,8 M.chinensis germplasm were divided into 3 groups:The Ⅰ group showed large leaves,long internodes,thick and long main stems,strong photosynthetic capacity and high yield.Group Ⅱ showed large leaves,short main stem and low yield.Group Ⅲ showed small leaves,long main stem and high SPAD value.[Conclusion]The genetic variation of the main photosynthetic and agronomic traits of the 8 M.chinensis germplasm is great,and X2,X3 and X4 germplasms have better comprehensive per-formance and could be used as excellent hybrid parents.High heritability traits such as SPAD,Ci and Tr should be included in the target traits of variety screening in the early stage of breed selection
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