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首页> 外文期刊>Genetic Resources and Crop Evolution >Spatial distribution of genetic variation of Stenocereus pruinosus (Otto) Buxb. in Mexico: analysing evidence on the origins of its domestication
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Spatial distribution of genetic variation of Stenocereus pruinosus (Otto) Buxb. in Mexico: analysing evidence on the origins of its domestication

机译：细叶拟南芥（Otto）Buxb遗传变异的空间分布。墨西哥：分析有关其驯化起源的证据

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摘要

We studied populations of Stenocereus pruinosus throughout Mexico, a species important for its edible fruit. The Tehuacan Valley is setting of ancient and the currently most active management of S. pruinosus; we hypothesized Tehuacan as the original area of domestication of S. pruinosus and expected to find there its highest genetic variation and original source of genes of cultivated plants. Through nuclear microsatellite loci we studied spatial distribution of genetic variation and population differentiation. We sampled wild and managed populations of the Central-western (Tehuacan, Central Valleys and Tehuantepec, Oaxaca), north-eastern (Huasteca) and south-eastern (Chiapas) regions. Differences among regions and populations were compared through homogeneity and exact test for F (IS) , AMOVA, Bayesian analysis, and genetic barriers. A niche analysis allowed corroborating taxonomic identity of populations. The highest genetic diversity was in Tehuantepec (H (E) = 0.841), decreasing towards the extremes of distribution (H (E) = 0.242 in Huasteca, H (E) = 0.254 in Chiapas). Genetic structure is significantly high among populations and regional groups, differentiating one group formed by northern and southern populations and other formed by populations of the Central-western region. Differences among groups suggested that populations from Huasteca could be species different to S. pruinosus, but the niche analysis did not support such hypothesis. Populations from Tehuantepec were different but genetically interconnected with those of Tehuacan. Tehuantepec is the main reservoir of genetic diversity of wild populations of S. pruinosus, but Tehuacan is the principal current area of domestication of S. pruinosus and probably where its domestication originated. Conclusions would be stronger by analyzing DNAc lineages.
机译：我们研究了整个墨西哥的肉食小食单胞菌（Snocereus pruinosus）的种群，这对食用水果很重要。特瓦坎河谷是古老的和目前最活跃的S. pruinosus管理区。我们以特瓦坎人为准，被认为是苏云金芽孢杆菌的驯化原始地区，并期望在那里找到其最高的遗传变异和栽培植物基因的原始来源。通过核微卫星基因座，我们研究了遗传变异和种群分化的空间分布。我们对中西部地区（特瓦坎，中央山谷和瓦哈卡州特万特佩克），东北地区（Huasteca）和东南地区（恰帕斯州）的野生种群和受管理种群进行了抽样调查。通过同质性和F（IS），AMOVA，贝叶斯分析和遗传障碍的精确检验，比较了地区和人群之间的差异。生态位分析可以证实种群的分类学特征。最高的遗传多样性是在特万特佩克（H（E）= 0.841），朝着分布的极端递减（Huasteca的H（E）= 0.242，恰帕斯州的H（E）= 0.254）。种群和区域群体之间的遗传结构非常高，区分了由北部和南部种群组成的一组和由中西部地区种群形成的另一组。群体之间的差异表明，来自Huasteca的种群可能与普氏链球菌有所不同，但利基分析不支持这种假设。特万特佩克（Tehuantepec）的种群不同，但与特瓦坎（Tehuacan）在遗传上相互关联。 Tehuantepec是普氏链球菌野生种群遗传多样性的主要储存库，但特瓦坎人是普氏链球菌驯化的当前主要区域，并且可能是其驯化起源的地方。通过分析DNAc谱系，结论会更强。

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