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首页> 外文期刊>The New Phytologist >Aegilops tauschii single nucleotide polymorphisms shed light on the origins of wheat D-genome genetic diversity and pinpoint the geographic origin of hexaploid wheat
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Aegilops tauschii single nucleotide polymorphisms shed light on the origins of wheat D-genome genetic diversity and pinpoint the geographic origin of hexaploid wheat

机译：牛肝菌单核苷酸多态性揭示了小麦D基因组遗传多样性的起源，并指出了六倍体小麦的地理起源

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摘要

Hexaploid wheat (Triticum aestivum, genomes AABBDD) originated by hybridization of tetraploid Triticum turgidum (genomes AABB) with Aegilops tauschii (genomes DD). Genetic relationships between A. tauschii and the wheat D genome are of central importance for the understanding of wheat origin and subsequent evolution. Genetic relationships among 477 A. tauschii and wheat accessions were studied with the A. tauschii 10K Infinium single nucleotide polymorphism (SNP) array. Aegilops tauschii consists oftwo lineages (designated 1 and 2) having little genetic contact. Each lineage consists of two closely related sublineages. A population within lineage 2 in the southwestern and southern Caspian appears to be the main source of the wheat D genome. Lineage1 contributed as little as 0.8% of the wheat D genome. Triticum aestivum is subdivided into the western and Far Eastern populations. The Far Eastern population conserved the genetic make-up of the nascent T. aestivum more than the western population. Inwheat, diversity is high in chromosomes 1D and 2D and it correlates in all wheat D-genome and A. tauschii chromosomes with recombination rates. Gene flow from A. tauschii was an important source of wheat genetic diversity and shaped its distribution along the D-genome chromosomes.
机译：六倍体小麦（普通小麦，基因组AABBDD）是通过四倍体小麦（基因组AABB）与节节麦草（基因组DD）杂交而产生的。 tauschii和小麦D基因组之间的遗传关系对于理解小麦起源和随后的进化至关重要。利用tauschii 10K Infinium单核苷酸多态性（SNP）阵列研究了477 tauschii与小麦种质之间的遗传关系。牛肝菌由两个遗传接触很少的谱系（分别为1和2）组成。每个谱系都包含两个密切相关的子谱系。西南里海和南部里海的谱系2内的种群似乎是小麦D基因组的主要来源。世系1仅贡献了小麦D基因组的0.8％。普通小麦又分为西部和远东种群。远东种群比西方种群对新生的小麦的遗传组成更保守。在小麦中，1D和2D染色体的多样性很高，并且在所有小麦D基因组和tauschii染色体中都与重组率相关。 tauschii的基因流是小麦遗传多样性的重要来源，并影响了其沿D基因组染色体的分布。

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