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首页> 外文OA文献 >Understanding the genetic diversity, spatial genetic structure and mating system at the hierarchical levels of fruits and individuals of a continuous Theobroma cacao population from the Brazilian Amazon
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Understanding the genetic diversity, spatial genetic structure and mating system at the hierarchical levels of fruits and individuals of a continuous Theobroma cacao population from the Brazilian Amazon

机译：了解来自巴西亚马逊的连续可可树可可种群的水果和个体等级的遗传多样性，空间遗传结构和交配系统

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Understanding the mating patterns of populations of tree species is a key component of ex situ genetic conservation. In this study, we analysed the genetic diversity, spatial genetic structure (SGS) and mating system at the hierarchical levels of fruits and individuals as well as pollen dispersal patterns in a continuous population of Theobroma cacao in Para State, Brazil. A total of 156 individuals in a 0.56 ha plot were mapped and genotyped for nine microsatellite loci. For the mating system analyses, 50 seeds were collected from nine seed trees by sampling five fruits per tree (10 seeds per fruit). Among the 156 individuals, 127 had unique multilocus genotypes, and the remaining were clones. The population was spatially aggregated; it demonstrated a significant SGS up to 15m that could be attributed primarily to the presence of clones. However, the short seed dispersal distance also contributed to this pattern. Population matings occurred mainly via outcrossing, but selfing was observed in some seed trees, which indicated the presence of individual variation for self-incompatibility. The matings were also correlated, especially within ((r) over cap (p(m)) = 0.607) rather than among the fruits ((r) over cap (p(m)) = 0.099), which suggested that a small number of pollen donors fertilised each fruit. The paternity analysis suggested a high proportion of pollen migration (61.3%), although within the plot, most of the pollen dispersal encompassed short distances (28m). The determination of these novel parameters provides the fundamental information required to establish long-term ex situ conservation strategies for this important tropical species. Heredity (2011) 106, 973-985; doi:10.1038/hdy.2010.145; published online 8 December 2010
机译：了解树木物种种群的交配模式是非原生境遗传保护的关键组成部分。在这项研究中，我们分析了巴西帕拉州可可豆连续种群中果实和个体的等级层次上的遗传多样性，空间遗传结构（SGS）和交配系统以及花粉散布模式。在一个0.56公顷的土地上，共绘制了156个个体的图谱，并对9个微卫星基因座进行了基因分型。对于交配系统分析，通过从9棵种子树中取样5个水果（每个水果10个种子）来收集50颗种子。在156个个体中，有127个具有独特的多基因座基因型，其余为克隆。人口在空间上聚集；它显示了高达15m的显着SGS，这可能主要归因于克隆的存在。然而，短的种子传播距离也促成了该模式。种群交配主要通过异型交配发生，但在某些种子树中观察到自交，这表明存在自我变异的个体变异。交配也具有相关性，特别是在（（r）上限（p（m））= 0.607）内，而不是在水果之间（（r）上限（p（m））= 0.099）之间，这表明相关性很小的花粉捐赠者使每个果子受精。亲子关系分析表明，花粉迁移的比例很高（61.3％），尽管在样地内，大多数花粉散布距离较短（28m）。这些新参数的确定提供了为这一重要热带物种建立长期非原生境保护战略所需的基本信息。遗传（2011）106，973-985; doi：10.1038 / hdy.2010.145;在线发布于2010年12月8日

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