62份珠子椒种质的遗传多样性分析与综合评价OA

[Objective]The genetic diversity of 62 bead-shaped pepper germplasm was investigated to provide a theoretical basis for development and utilization of bead-shaped pepper germplasm resources and breeding of new fermentation pepper varieties.[Method]22 phenotypic traits including 5 qualitative traits of fruit shape,fruit orientation,biotype,green fruit color and ripen fruit color,13 quantitative traits of initial flower height,plant height,plant width,stem diameter,fruit length,fruit width,pulp thickness,bearing fruits,single fruit weight,growth period,yield,lodging rate and incidence rate and 4 quality traits of capsaicine,VC,fat and crude fibre content of 62 bead-shaped pepper germplasm resources were evaluated by genetic diversity analysis,correlation analysis,clustering analysis,PCA and F-value comprehensive evaluation.[Result]62 bead-shaped pepper germplasm were primarily characterized by scattered upward-facing fruits,spherical or nearly spherical shape,green unripe fruit and red ripen fruit,and the diversity index of fruit biotype and pulp thickness was the lowest and highest respectively.There were significant correlations between 11 quantitative traits.The yield was positively related to fruit length,fruit width,single fruit weight,and pulp thickness,and negatively related to number of bearing fruits and growth period.62 bead-shaped pepper germplasm were divided into two groups by clustering analysis and the difference characteristics between two groups was in yield and growth period.6 principal components accounted for 70.43%of the genetic information.The comprehensive score of top 10 bead-shaped pepper germplasm resources was YZJ-19＞YZJ-11＞YZJ-8＞YZJ-5＞YZJ-7＞YZJ-12＞YZJ-3＞YZJ-1＞YZJ-9＞YZJ-37.[Conclusion]62 bead-shaped pepper germplasm are rich in genetic diversity and there are significant interactions between different phenotypic traits.10 excellent based-shaped pepper germplasm with a higher comprehensive score can be used as parental materials for breeding bead-pepper varieties with high yield,early maturity and good quality.