关键词: 辣椒, 种质资源, 果实品质, 抗病性, 聚类分析, 聚合推进树分析

Abstract: In order to screen out high-quality and multi-resistant pepper germplasms，this paper took 109 domestic and foreign pepper germplasms as test material；measured 6 traits of fruit quality；and identified whether they carried TMV resistant gene L4，Phytophthora capsici resistant gene CaPhyto，TSWV resistant gene Tsw and PVY resistant gene Pvr4. Then，the paper carried out comprehensive evaluation through genetic diversity analysis，correlation analysis，principal component analysis，cluster analysis and aggregated boosted tree（ABT）analysis. Results showed that the genetic diversities of 109 pepper germplasms were abundant，and coefficient of variation ranged from 24.51%-123.52%. Among them β-carotene content showed maximum variation degree. ABT analysis also indicated that capsanthin had the greatest influence on indexes determined by colorimeter，followed by lutein and that of β-carotene was minimum. The resistance molecular markers had identified 8 accessions carrying L4 gene，23 carrying CaPhyto gene and 1 carrying Pvr4 gene. The principal component analysis and cluster analysis showed that 109 pepper germplasms could be divided into 3 groups.The quality indexes of group I and group II were all relatively excellent. Finally，9 germplasms with both good quality and resistance were screened out.

Key words: pepper, germplasm resources, fruit quality, disease resistance, cluster analysis, aggregated boosted tree analysis