Evaluation and Study on Phenotypic and Qualitativ Traits of Alpinia oxyphylla Germplasm Resources

Using coefficient of variation,diversity index,cluster analysis,correlation analysis,principal component analysis and membership function analysis,22 phenotypic traits and 2 quality traits of 134 Alpinia oxyphylla germplasm resources were comprehensively evaluated,so as to provide reference for breeding and genetic research of excellent varieties in Maoming area.The results showed that there was great variation in all phenotypic characters,the coefficient of variation ranged from 9.49% to 48.05 %,and the coefficient of variation of ear weight was the largest.There was a good diversity among the traits,and the diversity index ranged from 1.93 to 2.08,with an average of 2.03.The 134 germplasm resources were divided into four groups by cluster analysis.There were complex correlations among phenotypic traits.Principal component analysis showed that the cumulative contribution rate of the first seven principal components was 84.50%.Fuzzy membership function method of comprehensive evaluation indicated that the group Ⅰ could be used as breeding bigger fruit,high yield and good quality germplasm,and group Ⅲ could be used as breeding small fruit type high yield and good quality germplasm,combined with the stepwise linear regression to select grain weight,width,thickness, fruit length,seed infructescence long shaft diameter,infructescence,seed size,stem leaf angle,ground diameter,fruit weight 10 phenotypic traits,used as important indexes for the comprehensive evaluation of Alpinia oxyphylla germplasm resources.