基于叶绿体DNA变异的湖北梨属种质系统进化及遗传多样性分析
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国家自然科学基金项目(面上项目)


Genetic diversty and phylogenetics of pear (Pyrus L.) germplasm resources from Hubei Province revealed by Chloroplast DNA variation
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The National Natural Science Foundation of China (General Program)

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    摘要:

    利用trnL intron、trnT-trnL、trnS-psbC和accD-psaI等4个叶绿体DNA片段对来自湖北省的88份梨属种质资源进行系统进化和遗传多样性分析。结果表明,4个cpDNA片段共检测到变异位点11个,其中单一突变位点6个,插入/缺失(Indel)位点5个。accD-psaI多态性最高,其变异位点数、核苷酸多态性和单倍型多样性均为最高。供试梨种质的核苷酸多样性和单倍型多样性分别为0.00112和0.769;Tajima's D检验值在P > 0.10水平上均不显著,表明所检测的4个区域以及合并后的片段均遵循中性进化模型;4个序列合并共检测到叶绿体单倍型10个,其中荆门和兴山梨种质检测到的单倍型最多。Hap2和Hap5是两个主要单倍型,分别占总样本的31.82%和30.68%;中介邻接网络图显示东方梨和西洋梨独立进化,而较为原始的稀有单倍型Hap8和Hap9均位于荆门,暗示该地区可能为砂梨的起源中心和多样性中心之一。

    Abstract:

    Four non-coding chloroplast region, trnL intron, trnT-trnL, trnS-psbC and accD-psaI were used to assay genetic diversity and phylogenetics of 88 pear accessions from Hubei Province. A totle of 11 variation sites included 6 SNP sites and 5 indel sites were recognized. Among 4 cpDNA regions, accD-psaI exhibited highest polymorphism with the most number of variable site, the most abundant haplotype diversity and nucleotide diversity. The values of nucleotide diversity and haplotype diversity of pear accessions in this study identified by four combined cpDNA fragments are 0.00112 and 0.769, respectively. All Tajima's D values are not statistical significant in P > 0.10, which indicate that variation of those chloroplast regions are based on natural theory of molecular evolution. A total of ten haplotypes are detected by the four cpDNA regions merging analysis. Among 13 collection sites, Jingmen and Xingshan own the most haplotypes. Hap2 and Hap5 are the two major haplotypes, which accounted for 31.82% and 30.68% of the total accessions, respectively. The network analysis of Pyrus L. cpDNA sequences showed that P. communis L. can be completely separated from oriental pear, and the rare haplotype Hap8 and Hap9 are all located in Jingmen, suggesting that the area may be one of the centers of origin or diversity of Pyrus L..

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张靖国,曹玉芬,陈启亮,等.基于叶绿体DNA变异的湖北梨属种质系统进化及遗传多样性分析[J].植物遗传资源学报,2016,17(4):766-772.

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  • 收稿日期:2015-08-10
  • 最后修改日期:2015-10-10
  • 录用日期:2016-01-29
  • 在线发布日期: 2016-07-07
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