三年桐EST-SSR标记的开发与种质遗传多样性分析
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国家林业公益性行业科研专项重点项目(201204403);国家“948”项目(2012-4-42)


Development of EST-SSR markers and their use for genetic diversity analysis in Tung tree (Vernicia fordii)
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The National Natural Science Foundation of China (General Program, Key Program, Major Research Plan)

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    摘要:

    以三年桐品种‘对年桐’发育中种子为材料,构建cDNA文库,获得3202个原始EST序列,经过去除冗余和低质量序列后,获得1047条非冗余单一序列,利用MISA软件从其中的173个非冗余EST序列中搜索得到212个 SSR位点。其中,二核苷酸重复类型为主导(68.39%),其次是三核苷酸重复类型(25.94%),其优势基元为AG/CT(43.87%)、AT/AT(19.34%)和AGC/GCT(5.66%)。针对可设计引物的68个序列进行EST-SSR引物设计,结合PCR扩增,数据分析,鉴定出14对多态性标记,用该14对引物对169份三年桐种质资源进行遗传多样性检测,共得到41个等位基因(Na),平均每对引物扩增出2.93个等位基因,期望杂合度(He)变幅为0.08~0.63,平均值为0.33,多态信息含量(PIC)变幅为0.08~0.56,平均值为0.30,表明14 对EST-SSR标记多态性较高,能较好反应三年桐种质的遗传多样性。三年桐种质资源按群体进行非加权配对算术平均法(UPGMA)聚类分析,群体间的相似度变幅为0.9604~0.9986,遗传距离变幅为0.0022~0.0404,表明三年桐群体间的遗传多样性相对较低,亲缘关系较近。对169份三年桐种质资源个体聚类分析,显示不同地理种源的遗传关系缺乏明显的地理结构。

    Abstract:

    The developing seeds of Tung tree (Vernicia fordii) cultivar ‘Duiniantong’ were used to construct the cDNA library and a total of 3202 original EST sequences were generated. After removing redundant and poor quality sequences, 1047 non-redundant ESTs were detected to contain 212 SSRs by MISA. The dinucleotide and trinucleotide repeats were the most abundant SSRs, accounting for 68.39% and 25.94%, respectively. Furthermore, AG/CT was the most abundant repeat motif (43.87%), followed by AT/TA (19.34%) and AGC/GCT (5.66%). A total of 68 EST-SSR primer pairs corresponding to 68 ESTs were designed, of which 14 were identified as polymorphic SSR markers by PCR and data analyses. Application of the 14 SSRs in genetics anlysis of 169 V. fordii accessions revealed that a total of 41 putative alleles were generated with a mean of 2.93 alleles per locus. The expected heterozygosity (He) and the polymorphism information content (PIC) values ranged from 0.08 to 0.63 and 0.08 to 0.56, with a mean of 0.33 and 0.30, respectively. The 14 EST-SSR markers exhibited a moderate level of polymorphism in V. fordii accessions. The genetic similarity coefficients and the genetic distances varied from 0.9604 to 0.9986 and 0.0022 to 0.0404, respectively, indicating close genetic relationships among V. fordii populations. The genetic similarity-based dendrogram revealed that there was not a significant geographic pattern of genotypes across the collection areas of 169 V. fordii resouces.

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贾宝光,林青,谭晓风,等.三年桐EST-SSR标记的开发与种质遗传多样性分析[J].植物遗传资源学报,2016,17(4):625-636.

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  • 收稿日期:2015-08-10
  • 最后修改日期:2016-02-05
  • 录用日期:2016-02-19
  • 在线发布日期: 2016-07-07
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