南方农业学报2017，Vol.48Issue(3)：386-392,7.DOI:10.3969/j:issn.2095-1191.2017.03.002
西藏林芝不同居群桃儿七表型多样性分析
Phenotypic diversity of Sinopodophyllum hexandrum from different populations in Nyingchi, Tibet
摘要
Abstract
[Objective]The present experiment analyzed phenotypic diversity of Sinopodophyllum hexandrum from dif-ferent populations in Nyingchi, Tibet, in order to provide reference for germplasm resource identification, protection and utilization. [Method]Twelve phenotypic traits of S. hexandrum from four different populations(DWZ,DJC,LZQ and NYG) in Nyingchi were measured, then diversity indexes were calculated, and mathematical statistical analysis was conducted for average values of those 12 trait indexes. [Result]Diversity of leaves, stems, fruits, seeds of S. hexandrum from 4 popula-tions were high, and Shannon-Wiener diversity index was 0.16-1.76. The rank of the diversity indexes were as follows: leaf transverse diameter>leaf longitudinal diameter>leaf transverse diameter/leaf longitudinal diameter>fruit transverse diameter>fruit longitudinal diameter >stem colour >seed number >fruit transverse diameter/fruit longitudinal diameter >1000 -seed weight>leaf indumentum=leaf incision>leaf crack depth. The variation of leaf area was large, followed by fruit size and seed characteristics, variation of leaf indumentum and leaf incision was relatively stable. Rank of genetic diversity of different populations was as follows: DJC=LZQ>NYG>DWZ. Principal component analysis results showed that: eigenvalue of the first principal component was 6.799 with contribution rate of 56.662%,which was mainly determined by fruit transverse diame-ter/fruit longitudinal diameter, fruit transverse diameter, stem color, leaf crack depth, leaf transverse diameter and leaf longitudinal diameter. Eigenvalue of the second principal component was 3.024 with contribution rate of 25.200%, which was mainly determined by fruit transverse diameter, seed number, leaf transverse diameter/leaf longitudinal diameter. Ac-cording to correlation analysis, there were significant correlation(P<0.05) and extremely significant correlation(P<0.01) among partial traits of S. hexandrum(between leaf transverse diameter and leaf longitudinal diameter, leaf indumentum and leaf incision, fruit transverse diameter/fruit longitudinal diameter and stem colour). Cluster analysis results showed that, the four populations can be divided into two groups at euclidean distance 9, where DJC population first separated from the four provenances.Hence it belonged to the first category and the other three populations grouped into the second category. At euclidean distance 2, the second category was divided into two subgroups: LZQ population was in one category, DWZ and NYG populations were in the other category. [Conclusion]The phenotypic diversity of S. hexandrum from different populations in Nyingchi is high, and the variation of phenotypic traits is discontinuous.关键词
桃儿七/居群/表型多样性/西藏林芝Key words
Sinopodophyllum hexandrum/population/phenotypic diversity/Nyingchi/Tibet分类
生物科学引用本文复制引用
丹曲,张艳福,方江平,郭其强,李慧娥..西藏林芝不同居群桃儿七表型多样性分析[J].南方农业学报,2017,48(3):386-392,7.基金项目
国家自然科学基金项目(31460079) （31460079）
西藏大学农牧学院研究生创新项目(YJS2015-08) （YJS2015-08）
