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首页> 外文期刊>Genetic Resources and Crop Evolution >Presence of phylogeographic structure among wild diploid alfalfa accessions (Medicago sativa L. subsp microcarpa Urb.) with evidence of the center of origin
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Presence of phylogeographic structure among wild diploid alfalfa accessions (Medicago sativa L. subsp microcarpa Urb.) with evidence of the center of origin

机译：在野生二倍体苜蓿种（Medicago sativa L. subsp microcarpa Urb。）中存在系谱结构，并具有起源中心的证据

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摘要

The genetic structure of wild germplasm on a macrogeographic scale has implications for collection and conservation of wild genetic resources of economically important plants. Cultivated alfalfa is derived from a taxonomic group called the Medicago sativa-falcata complex, which includes a number of morphologically and genetically differentiated diploid and tetraploid subspecies representing the primary gene pool for alfalfa improvement. Although the origin of the taxa included in M. sativa-falcata complex has been described broadly, the center of diversity for each taxon is not clear. In this study, 60 individual genotypes from 16 accessions of the diploid taxon M. sativa subsp. microcarpa Urb. [M. sativa subsp. caerulea (Less. ex Ledeb.) Schmalh.] were obtained from the two proposed centers of diversity, Caucasia and Central Asia, and were genotyped with 89 simple sequence repeat markers. Phylogenetic reconstructions together with population genetics statistics (heterozygosity, allelic diversity, and F-ST) were used to describe the pattern of present genetic diversity, to deduce biogeographic history, and to infer the center of diversity. Our results revealed that the Central Asian accessions were distinct from the Caucasian accessions, and that overall accessions, genetic distance was positively correlated with geographical distance, indicating a spatial genetic structure. The accessions from the Caucasian region had higher mean F-ST values, higher allele diversity and higher heterozygosity, suggesting that the Caucasian region is the likely center of diversity for M. sativa subsp. microcarpa [M. sativa subsp. caerulea] and the accessions recolonized Central Asia from Caucasia after the glacial retreat.
机译：宏观上野生种质的遗传结构对具有重要经济意义的植物的野生遗传资源的收集和保存具有重要意义。培养的苜蓿来自一个称为苜蓿苜蓿-苜蓿复合体的分类学类别，其中包括许多形态和遗传上不同的二倍体和四倍体亚种，代表了苜蓿改良的主要基因库。尽管已广泛描述了苜蓿-苜蓿复合体中包含的分类单元的起源，但每个分类单元的多样性中心尚不清楚。在这项研究中，来自二倍体分类单元M. sativa subsp的16个种的60个个体基因型。小果皮[M.苜蓿亚种拟南芥（Less。ex Ledeb。）Schmalh。]是从两个拟议的多样性中心高加索和中亚获得的，并用89个简单的序列重复标记进行了基因分型。系统发育重建与种群遗传学统计数据（杂合性，等位基因多样性和F-ST）一起用于描述当前遗传多样性的模式，推断生物地理历史并推断多样性的中心。我们的结果表明，中亚种质与白种人种质不同，总体种质，遗传距离与地理距离呈正相关，表明其空间遗传结构。来自高加索地区的种质具有较高的平均F-ST值，较高的等位基因多样性和较高的杂合性，这表明高加索地区可能是苜蓿亚种的多样性中心。小果皮[M.苜蓿亚种[caerulea]和这些种质在冰川退缩后从高加索地区重新定居。

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