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首页> 外文期刊>Genetic Resources and Crop Evolution >Genetic diversity of rbcL gene in Elymus trachycaulus complex and their phylogenetic relationships to several Triticeae species
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Genetic diversity of rbcL gene in Elymus trachycaulus complex and their phylogenetic relationships to several Triticeae species

机译：披碱草中rbcL基因的遗传多样性及其与几种小麦的亲缘关系。

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摘要

Elymus trachycaulus complex species are known for their morphological variability, but little is known about their genetic basis. The phylogenetic relationships among the E. trachycaulus complex, and their systematic relation to other species in Triticeae remain unknown. Nucleotide diversity of ribulose-1,5 bisphosphate-carboxylase (rbcL) gene in E. trachycaulus complex species and several other Triticeae was first characterized and compared. A primary conclusion of the present study is that nucleotide diversity for rbcL gene in E. trachycaulus species was detected with the estimates of nucleotide diversity θ = 0.00039 and π = 0.00043. The estimate of nucleotide diversity in rbcL gene for species with different genome constitution here ranged from 0.00099 (π) and 0.00099 (θ) for the species with Ns genome to 0.00226 (π) and 0.00291 (θ) for the species with St genome. The phylogenetic relationships of these species were assessed using these rbcL sequences. A total of 47 variable positions including 19 parsimony-informative sites were detected among 24 accessions of 18 species/subspecies. The species with St, H/I and Ns genomes well separated from each other, and formed a three distinct clades with higher bootstrap values support for both Parsimony and NJ analyses. The St genome containing species is sister group of H/I genome containing species. Our result confirms that Pseudoroegneria is the maternal genome donor to these Elymus species studied here, regardless of their distribution. Elymus trachycaulus complex are more related to each other than to E. glaucescens, E. patagonicus, and E. solandri. This study suggested that Elymus species with StH genomes may form from multiple closely related sets of donors.
机译：披碱草（Elymus trachycaulus）复杂物种因其形态变异而闻名，但对其遗传基础知之甚少。 E. trachycaulus复合体之间的系统发育关系，以及它们与小麦属中其他物种的系统关系仍然未知。首先表征并比较了沙棘肠杆菌复杂物种和其他几种小麦中核糖-1,5-双磷酸羧化酶（r​​bcL）基因的核苷酸多样性。本研究的主要结论是，通过估计核苷酸多样性θ= 0.00039和π= 0.00043，可以检测出曲霉种rbcL基因的核苷酸多样性。对于具有不同基因组组成的物种，rbcL基因中核苷酸多样性的估计值范围从Ns基因组物种的0.00099（π）和0.00099（θ）到St基因组物种的0.00226（π）和0.00291（θ）。使用这些rbcL序列评估了这些物种的系统发育关系。在18个物种/亚种的24个种中共检测到47个可变位置，包括19个简约信息位点。具有St，H / I和Ns基因组的物种彼此分离良好，并形成了三个截然不同的进化枝，具有较高的自举值，可支持简约性和NJ分析。含有St基因组的物种是含有H / I基因组的物种的姐妹组。我们的结果证实，假单胞菌属是本文研究的这些披碱草属物种的母体基因组供体，无论其分布如何。 Elymus trachycaulus复合体之间的相互关系比与E. glaucescens，E。patagonicus和E. solandri之间的关系更为密切。这项研究表明，具有StH基因组的披碱草属物种可能是由多个紧密相关的供体集合形成的。

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