Genetic diversity and population structure of 288 potato (&ITSolanum tuberosum&IT L.) germplasms revealed by SSR and AFLP markers

文献类型： 外文期刊

第一作者： Wang, Jian

作者： Wang, Jian;Liu Qing-chang;Wang, Jian;He Miao-miao;Hou, Lu;Wang Ruo-yu

作者机构：

关键词： potato germplasms;genetic diversity;population structure;SSR;AFLP

期刊名称：JOURNAL OF INTEGRATIVE AGRICULTURE （ 影响因子：2.848； 五年影响因子：2.979 ）

ISSN： 2095-3119

年卷期： 2017 年 16 卷 11 期

页码：

收录情况： SCI

摘要： Potato (Solanum tuberosum L.) is an important staple food and economic crop in many countries. China has led world potato production in recent years. To understand the genetic diversity of potato germplasms and to enrich the current gene pool for potato improvement, we made a global collection consisted of 288 potato germplasms from eight countries and the International Potato Center (CIP). Using SSR and AFLP techniques, we evaluated the genetic diversity and population structure of these 288 potato accessions. A total of 190 alleles on 20 SSR loci were detected and all of the SSR alleles were polymorphic among these potato germplasms with an average of 9.5 alleles per SSR locus ranging from 2 to 23. The effective number of alleles per locus (Ne*), Nei's genetic diversity (H*), and Shannon's information index (l*) was from (0.1709 +/- 0.3698)to (1.6166 +/- 0.3414), (0.076 +/- 0.1388) to (0.3812 +/- 0.1886), and (0.1324 +/- 0.1970) to (0.5347 +/- 0.1440), respectively, and the mean polymorphic information content (PIC) value was 0.7312. A total of 988 AFLP alleles were detected by 10 AFLP primer combinations with 983 polymorphic alleles, and 99.49% alleles was polymorphic with an average of 98.3 polymorphic alleles per primer combination ranging from 91 to 116. The values of Ne*, H* and l* were from (1.5162 +/- 0.311) to (1.6423 +/- 0.3278), (0.3114 +/- 0.145) to (0.3675 +/- 0.1121), and (0.4761 +/- 0.1792) to (0.547 +/- 0.1322), respectively, and the average PIC value was 0.9871. Bayesian analysis discriminated the accessions into seven subgroup and an admix group. The majority of accessions from CIP and China were assigned into SG1, SG5, SG6, SG7 and admix group. Accessions in SG3 were mainly from CIP and two small groups SG2 and SG4 were mainly from northeastern China. In general, the results obtained from Bayesian statistical analysis, cluster analysis and principal coordinate analysis consistently revealed the lack of geographical differentiation among country-wide collections, indicating germplasm introduction was common for the countries out of potato origin center. The polymorphic markers and the differentiate genetic lineages found in this study provide useful information for potato improvement and conservation programs.

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