不同朝天椒品种果实性状评价及聚类分析

Fruit traits evaluation and cluster analysis of different Chaotian pepper varieties

为筛选适宜河南地区种植的农艺性状优良的朝天椒新品种,并为辣椒品种改良提供理论依据,对38个朝天椒品种的果实性状进行差异性分析、相关性分析、主成分分析和聚类分析。结果表明,品种间果实性状差异较大,变异系数范围为9.24%~53.03%,其中二氢辣椒素含量变异程度最大;果实性状间存在相关性,其中果实长度和果实横径与单果质量、果实长度与心室数、果皮厚度与烘干所需时间、辣椒素含量与二氢辣椒素含量均呈极显著正相关。主成分分析结果表明,共筛选出4个主成分,方差累积贡献率为70.287%,能反映辣椒农艺性状的大部分信息。通过表型聚类和液相芯片基因型数据聚类分析,明确了供试材料间的亲缘关系。综上,品种DKP-8418(P31)、好农515红绿(P28)和DO1844欧兰德(P24)综合表现优良,适宜在河南地区推广种植。

In order to screen new varieties of Chaotian pepper with good agronomic characters suitable for planting in Henan,and provide theoretical basis for the improvement of pepper varieties,the difference analysis,correlation analysis,principal component analysis and cluster analysis of fruit characters of 38 Chaotian pepper varieties were carried out.The results showed that the variation coefficient of fruit traits was 9.24%-53.03%,and the variation degree of dihydrocapsaicin character was the largest.There was significant positive correlation between fruit length,fruit transverse diameter and single fruit mass,fruit length and ventricular number,peel thickness and time of drying,capsaicin content and dihydrocapsaicin content.The results of principal component analysis showed that four principal components were selected,and the cumulative contribution rate of variance was 70.287%,which could reflect most of the information of capsicum agronomic traits.Through phenotypic clustering and liquid chip genotypic data clustering analysis,the relationship between the tested materials was clarified.In summary,the varieties DKP-8418(P31),Haonong 515 Red Green(P28)and DO1844 Olander(P24)showed excellent performance and were suitable for popularization and planting in Henan.