[关键词]
[摘要]
目的 对我国三叶青种质资源64个样本的遗传多样性进行分析。方法 利用ISSR-PCR技术进行扩增,然后利用POPGENE 32软件及NTSYS软件分析三叶青种质资源64个样本的遗传多样性及亲缘关系,并根据UPGMA法,构建亲缘关系树状图。结果 从30条引物中筛选出10条条带清晰、重复性好的引物对64份供试材料的基因组DNA进行扩增。扩增出了83个多态位点,多态百分数为71.43%~100.00%,平均多态百分数为94.31%,引物S17扩增得到的多态位点最多,为11个;引物P6扩增得到的多态位点最少,为5个,10条引物扩增得到的多态位点平均为8.3个;遗传多样性分析显示,平均检测等位基因数(Na)为1.943 1,平均有效等位基因数(Ne)为1.381 08,64个样本的平均Nei’s基因多样性指数(H)为0.242 98,平均Shannon多样性指数(I)为0.385 83。64个样本遗传相似系数的变异范围为0.431 8~0.988 6。根据相似系数矩阵按UPGMA法进行聚类,在遗传相似性系数为0.715 5处,64份供试材料可分为6组;另外,根据10个ISSR引物的扩增结果,筛选出引物ISSR 20、UBC857和S17扩增的DNA指纹图谱可用于64个三叶青样本种质的鉴定。结论 我国三叶青种质资源拥有丰富的遗传多样性和基因的相对稳定性,ISSR分析可揭示我国三叶青种质资源间的亲缘关系,为评价、鉴定和新品种选育提供一定的参考依据。
[Key word]
[Abstract]
Objective In this paper, the genetic diversity of 64 samples of Tetrastigma hemsleyanum germplasm resources in Chinese was analyzed. Methods ISSR-PCR was firstly used to amplify, and then POPGENE 32 software and NTSYS software was used to analyze the genetic diversity and phylogenetic relationship of 64 samples of T. hemsleyanum germplasm resources, and phylogenetic tree was constructed according to the UPGMA method. Results Ten primers with clear and reproducible bands were screened from 30 primers and used for genomic DNA amplification of 64 sample materials. A total of 83 polymorphic locis were amplified, whose polymorphic percentages were 71.43%-100% and average polymorphism percentage was 94.31%. The amplification polymorphic locis of primer S17 were the most (11) and the amplification polymorphic locis of primer P6 were the least (5), the average amplified polymorphic locis of 10 primers were 8.3. Genetic diversity analysis showed that the average number of alleles (Na) of 64 samples was 1.943 1, the average effective allele number (Ne) was 1.381 08, the average Nei's gene diversity index (H) was 0.242 98, and the average Shannon diversity index (I) was 0.385 83. The variation range of the genetic similarity coefficient of the 64 samples was 0.431 8-0.988 6. A total of 64 samples were divided to six groups by UPGMA clustering method according to the similarity coefficient matrix when the genetic similarity coefficient was 0.715 5, which showed the abundant genetic diversity and relative gene stability of T. hemsleyanum germplasm resources. In addition, amplification figures by primers ISSR20, UBC857, and S17 were screened based on amplification result of 10 ISSR primers, and DNA fingerprinting was constructed, which can be used to identify 64 samples of T. hemsleyanum tested. Conclusion There are abundant genetic diversity and relative gene stability in T. hemsleyanum germplasm esources in China. ISSR analysis can reveal the genetic relationship among T. hemsleyanum germplasm resources in China, and provide certain reference for the evaluation, identification and new variety breeding of T. hemsleyanum germplasm resources in China.
[中图分类号]
[基金项目]
国家自然科学基金资助项目(31860084)