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首页> 外文期刊>Biochemical Genetics >Microsatellite analysis of genetic variation and population genetic differentiation in autotetraploid and diploid rice.
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Microsatellite analysis of genetic variation and population genetic differentiation in autotetraploid and diploid rice.

机译：四倍体和二倍体水稻遗传变异和群体遗传分化的微卫星分析。

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摘要

Genetic diversity and population genetic structure of autotetraploid and diploid populations of rice collected from Chengdu Institute of Biology, Chinese Academy of Sciences, were studied based on 36 microsatellite loci. Among 50 varieties, a moderate to high level of genetic diversity was observed at the population level, with the number of alleles per locus (Ae) ranging from 2 to 6 (mean 3.028) and polymorphism information content ranging from 0.04 to 0.76 (mean 0.366). The expected heterozygosity (He) varied from 0.04 to 0.76 (mean 0.370) and Shannon's index (I) from 0.098 to 1.613 (mean 0.649). The autotetraploid populations showed slightly higher levels of Ae, He, and I than the diploid populations. Rare alleles were observed at most of the simple sequence repeat loci in one or more of the 50 accessions, and a core fingerprint database of the autotetraploid and diploid rice was constructed. The F-statistics showed genetic variability mainly among autotetraploid populations rather than diploid populations (Fst = 0.066). Cluster analysis of the 50 accessions showed four major groups. Group I contained all of the autotetraploid and diploid indica maintainer lines and an autotetraploid and its original diploid indica male sterile lines. Group II contained only the original IR accessions. Group III was more diverse than either Group II or Group IV, comprising both autotetraploid and diploid indica restoring lines. Group IV included a japonica cluster of the autotetraploid and diploid rices. Furthermore, genetic differences at the single-locus and two-locus levels, as well as components due to allelic and gametic differentiation, were revealed between autotetraploid and diploid varieties. This analysis indicated that the gene pools of diploid and autotetraploid rice were somewhat dissimilar, as variation exists that distinguishes autotetraploid from diploid rices. Using this variation, we can breed new autotetraploid varieties with some important agricultural characters that were not found in the original diploid rice varieties.
机译：基于36个微卫星位点，对中国科学院成都生物研究所收集的水稻同源四倍体和二倍体群体的遗传多样性和群体遗传结构进行了研究。在50个变种中，在种群水平上观察到中等至高水平的遗传多样性，每个基因座（Ae）的等位基因数量范围为2至6（平均3.028），多态性信息含量范围为0.04至0.76（平均0.366） ）。预期的杂合度（He）从0.04到0.76（平均0.370），Shannon指数（I）从0.098到1.613（平均0.649）。同源四倍体种群显示的Ae，He和I水平略高于二倍体种群。在50个材料中的一个或多个中，在大多数简单序列重复基因座上均观察到稀有等位基因，并建立了同源四倍体和二倍体水稻的核心指纹数据库。 F统计量显示遗传变异主要在四倍体种群中，而不是在二倍体种群中（Fst = 0.066）。对50个种质的聚类分析显示了四个主要类别。第一组包含所有的四倍体和二倍体in稻保持系，以及一个四倍体及其原始的二倍体in雄性不育系。第二组仅包含原始IR入藏。第三组比第二组或第四组更为多样化，既包括同源四倍体和二倍体in稻恢复系。第四组包括四倍体和二倍体水稻的粳稻簇。此外，在同源四倍体和二倍体变种之间揭示了在单基因座和两基因座水平的遗传差异，以及由于等位基因和配子分化的成分。该分析表明二倍体和同源四倍体水稻的基因库有些不同，因为存在将同源四倍体与二倍体水稻区分开的变异。利用这种变异，我们可以培育具有一些重要农业特性的新的四倍体新品种，而这些特性在原始二倍体水稻品种中没有。

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