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首页> 外文期刊>Genetic Resources and Crop Evolution >Phylogeographic patterns and possible incipient domestication of Jacaratia mexicana A. DC. (Caricaceae) in Mexico
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Phylogeographic patterns and possible incipient domestication of Jacaratia mexicana A. DC. (Caricaceae) in Mexico

机译：Jacaratia mexicana A. DC的系统记录模式和可能的初期驯化。 （茄科）在墨西哥

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摘要

Jacaratia mexicana A. DC. (Caricaceae) is a tropical tree distributed throughout Mexico and Mesoamerica. Some evidence in Mexico indicates the presence of an incipient domestication process in this species. Phylogeographical analyses can potentially determine contemporary patterns of gene flow, isolation between population lineages, as well as historical processes such as population bottlenecks or expansions on their geographical areas. In this study we reconstruct the phylogeographical patterns in populations of J. mexicana A. DC., in order to find differences between genetic variation among wild and cultivated populations utilizing chloroplast DNA and nuclear DNA sequences. We generate a Bayesian phylogenetic tree, to estimate the divergence time between clades using calibrated mutation rates. We also infer the demographic history of these populations using neutrality tests among wild and cultivated accessions. We identified higher levels of haplotype and nucleotide diversity for the cpDNA and ITS types in wild populations than in domesticated populations. These results indicate a reduction of genetic diversity derived from human selection on domestication traits. Neutrality test suggests population expansion detected by the significant negative values of Fu's Fs in the cultivated populations of this specie. These process results in an excess of rare polymorphism with the fixation of certain advantageous mutation throughout time, this implication are in accordance with the role of the strong selection in the fruit traits of J. mexicana. The dated phylogeny constructed with BEAST program indicated a dispersion pattern for the J. mexicana ancestors across the South Pacific and South Eastern populations during the late Pliocene. Posterior dispersion and divergence in the clades from Central Mexico and North Pacific are in agreement with the episodes of mountain-building in different regions of Mexico.
机译：Jacaratia mexicanaA.DC。 （胭脂科）是分布在墨西哥和中美洲的热带树木。墨西哥的一些证据表明，该物种开始出现驯化过程。文字系统分析可能会确定当代的基因流模式，种群谱系之间的隔离以及历史过程，例如种群瓶颈或地理区域的扩展。在这项研究中，我们重建了墨西哥洋蓟（J. mexicana A. DC。）种群的系统地理模式，以便利用叶绿体DNA和核DNA序列找到野生种群和耕种种群的遗传变异之间的差异。我们生成贝叶斯系统树，以使用校正的突变率估算进化枝之间的发散时间。我们还使用野生和栽培种之间的中性检验推断出这些种群的人口历史。我们发现野生种群中cpDNA和ITS类型的单倍型和核苷酸多样性水平高于驯养种群。这些结果表明减少了人类对驯化性状的选择所产生的遗传多样性。中性测试表明，该物种的耕种种群中，Fu's Fs的显着负值可检测出种群扩张。这些过程导致过量的稀有多态性随着时间的推移固定在某些有利的突变上，这暗示着强选择在墨西哥菜果实性状中的作用。用BEAST程序构建的过时的系统发育表明，上新世末期，墨西哥J. mexicana祖先在南太平洋和东南部种群中的分布方式。来自中部墨西哥和北太平洋的进化枝的后部散布和发散与墨西哥不同地区的山区建筑事件一致。

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