| 基于SNP标记揭示我国小麦品种(系)的遗传多样性 |
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| 基金项目： | The work was supported by the National Key Research and Development Program(2017YFD0100802);the Hubei Technical Innovation Project(2018ABA085);the Modern Agro-Industry Technology Research Systems(CARS-03);the Hubei Agricultural Science and Technology Innovation Center Project |
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| 摘 要： | 为了解我国主要小麦品种(系)的遗传多样性,为亲本组配提供参考,利用90KSNP芯片技术对国内为主的240个小麦品种(系)进行全基因组扫描,分析其遗传多样性和遗传基础。结果表明,多态性SNP位点在B基因组最多, D基因组最最少,尤其4D上最少;在全基因组范围内PIC平均值为0.26。参试品种间平均遗传相似系数为0.656,变幅为0.133～0.998,且87.05%品种间遗传相似系数在0.60～0.78之间;国内西南麦区和长江中下游麦区小麦品种(系)间的平均相似系数较高,分别为0.718和0.712,国外品种(系)间的相似系数最低,为0.552。聚类分析将参试品种(系)划分为7个类群,大部分类群含有来自不同区域育成品种(系),主成分分析显示各区域育成的品种(系)相互交集,表明我国各省市间种质资源交流较为频繁,但部分单位育成的品种(系)遗传基础不够丰富,部分品种(系)间遗传相似性较高,在育种中亟待引入新的种质,拓宽遗传基础。
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| 收稿时间： | 2019-06-03 |
Revealing the genetic diversity of wheat varieties (lines) in China based on SNP markers |
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| Authors: | LIU Yi-Ke ZHU Zhan-Wang CHEN Ling ZOU Juan TONG Han-Wen ZHU Guang HE Wei-Jie ZHANG Yu-Qing GAO Chun-Bao |
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| Institution: | 1.Food Crops Institute, Hubei Academy of Agricultural Sciences / Wheat Disease Biology Research Station on Central China, Ministry of Agriculture, China / Hubei Engineering and Technology Research Center of Wheat, Wuhan 430064, Hubei, China;2.Hubei Collaborative Innovation Center for Grain Industry / Yangtze University, Jingzhou 434025, Hubei China |
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| Abstract: | In order to understand the genetic diversity of major wheat cultivars (lines) in China and provide a reference for parent selection, we selected 240 domestically dominated wheat cultivars (lines) for SNP genotyping using the Illumina 90K iSelect SNP chip. The SNP loci were the most in the B genome, and were the least in the D genome, especially in 4D. The mean value of the polymorphism information content (PIC) was 0.26. The genetic similarity of the 240 cultivars (lines) ranged from 0.133 to 0.998 with an average value of 0.656. However, genetic similarity of 0.60 to 0.78 was found in 87.05% of the tested cultivars (lines). The genetic similarity was up to 0.718 between Southwest Wheat Region cultivars (lines), 0.712 between Middle and Low Yangtze Valleys Wheat Region, and 0.552 between foreign cultivars (lines). The 240 wheat cultivars (lines) were classified into seven groups by UPGMA analyses, most of them contained varieties (lines) bred from different regions. Principal component analysis (PCA) showed that the cultivars (lines) bred in different regions intersected together. The exchange of germplasm resources among different regions in China was frequent, but the genetic basis of the cultivars (lines) bred by some units was not rich enough and the genetic similarity between some varieties (lines) was higher. It is urgent to introduce new germplasm and broaden the genetic basis in breeding. |
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| Keywords: | wheat cultivars genetic diversity SNPs |
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