| 新疆、甘肃黍稷资源的遗传多样性与群体遗传结构研究 |
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| 引用本文： | 薛延桃,陆平,史梦莎,孙昊月,刘敏轩,王瑞云.新疆、甘肃黍稷资源的遗传多样性与群体遗传结构研究[J].作物学报,2019,45(10):1511-1521. |
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| 作者姓名： | 薛延桃 陆平 史梦莎 孙昊月 刘敏轩 王瑞云 |
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| 作者单位： | 中国农业科学院作物科学研究所;山西农业大学农学院;山西省农业科学院农作物品种资源研究所/农业部黄土高原作物基因资源与种质创制重点实验室/杂粮种质资源发掘与遗传改良山西省重点实验室 |
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| 摘 要： | 新疆、甘肃是我国古代丝绸之路的必经之地,同时也是黍稷的主要种植区。研究该地区黍稷种质资源的遗传多样性和群体遗传结构,对于开展黍稷起源进化研究,明确黍稷传播路径具有重要的意义。本研究利用103对SSR标记对来自新疆、甘肃的216份黍稷资源进行了遗传多样性分析,共检测到299个等位基因,平均每个位点产生2.9个等位基因,平均Shannon’s指数为0.7360,平均观测杂合度为0.6298,平均期望杂合度为0.5497,多态性信息含量指数为0.0688～0.7786,均值0.4714,具有中度多态性。216份黍稷资源的近交系数为0.5870,遗传分化系数为0.0383,遗传分化程度很小。甘肃资源的等位基因数、Shannon-Weaver多样性指数、Nei’s期望杂合度和PIC值分别为2.8252、0.7347、0.4501和0.4674,其遗传参数值均大于新疆资源,表明甘肃种质资源的遗传多样性较新疆更丰富。基于遗传距离的聚类分析将216份黍稷资源分为5个类群,类群I～IV共包含7份黍稷资源,与别的资源遗传关系较远; 96%的资源集中于类群V,在遗传距离为0.38处,类群V又分为4个亚群,亚群A和亚群D主要包含甘肃资源,亚群B和亚群C主要包含新疆资源,表明新疆与甘肃资源有明显分离和相互渗透现象。聚类分析与群体遗传结构分析结果相似,均与生态地理分布相关。
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| 收稿时间： | 2018-12-21 |
Genetic diversity and population genetic structure of broomcorn millet accessions in Xinjiang and Gansu |
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| XUE Yan-Tao,LU Ping,SHI Meng-Sha,SUN Hao-Yue,LIU Min-Xuan,WANG Rui-Yun.Genetic diversity and population genetic structure of broomcorn millet accessions in Xinjiang and Gansu[J].Acta Agronomica Sinica,2019,45(10):1511-1521. |
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| Authors: | XUE Yan-Tao LU Ping SHI Meng-Sha SUN Hao-Yue LIU Min-Xuan WANG Rui-Yun |
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| Institution: | 1.Institute of Crop Sciences, Chinese Academy of Agricultural Sciences, Beijing 100081, China;2.College of Agriculture, Shanxi Agricultural University, Taigu 030801, Shanxi, China;3.Institute of Crop Germplasm Resources, Shanxi Academy of Agricultural Sciences / Key Laboratory of Crop Gene Resources and Germplasm Enhancement on Loess Plateau, Ministry of Agriculture / Shanxi Key Laboratory of Genetic Resources and Genetic Improvement of Minor Crops, Taiyuan 030031, Shanxi, China |
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| Abstract: | Xinjiang and Gansu, are the critical junctures for the ancient Silk Road of China as well as the main cultivation areas of broomcorn millet. In this study, a total of 103 SSR primers and 216 millets were used to analyze the genetic diversity and population genetic structure which promotes the study on origin evolution and propagation path of broomcorn millet. The 299 alleles were detected with an average of 2.9 for each SSR. The mean values of Shannon-Weaver index, Ne, Nei were 0.7360, 0.6298, and 0.5497 respectively, and the range of PIC value was 0.0688-0.7786 with a mean of 0.4714, indicating the moderate polymorphism of these SSRs. The genetic differentiation was very small in terms of the inbreeding line number and genetic differentiation coefficient which were 0.5870 and 0.0383, respectively. The values of Na, Shannon-Weaver index, Nei, PIC of broomcorn millet accessions in Gansu were 2.8252, 0.7347, 0.4501, and 0.4674, respectively, which were higher than those in Xinjiang, indicating more abundant genetic diversity in Gansu. Two hundred and sixteen broomcorn millet accessions could be divided into five groups based on cluster analysis of genetic distance. Group I-IV had seven accessions with a distant genetic relationship with other samples. Ninety-six percent of accessions were distributed in group V, which were further divided into four subgroups at a genetic distance of 0.38. The main accessions of subgroups A and D came from Gansu, those of subgroups B and C were from Xinjiang, indicating that the accessions between Xinjiang and Gansu are obviously separated and permeated with each other. The result of genetic structure analysis was similar to that of UPGMA clustering, both of them related to their geographical distribution. |
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| Keywords: | broomcorn millet Xinjiang Gansu SSR marker genetic diversity |
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