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首页> 外文期刊>Silvae genetica >Genetic diversity and spatial genetic structure in populations of Orbignya phalerata Mart. under different exploitation intensities in the Brazilian savanna
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Genetic diversity and spatial genetic structure in populations of Orbignya phalerata Mart. under different exploitation intensities in the Brazilian savanna

机译:Orbignya phalerata Mart种群的遗传多样性和空间遗传结构。在巴西大草原上不同的开发强度下

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摘要

Genetic studies in tropical tree species have found signs of decreased genetic diversity and increased levels of inbreeding and spatial genetic structure (SGS) in fragmented and exploited populations. The aim of this paper was to investigate genetic diversity, structure, and intrapopulation SGS using eight microsatellite loci for three Orbignya phalerata populations that have undergone different intensities of seed harvesting. From each population, we georeferenced and sampled 30 seedlings, 30 juveniles, and 30 adult trees. The total number of alleles over all loci (k), and observed (Ho) and expected heterozygosity (He) presented lower values for the population experiencing more intense fruit harvesting than less heavily exploited populations, suggesting that fruit harvesting may decrease genetic diversity. Null alleles were detected in practically all loci among seedlings, juveniles, and adults in all populations, indicating that the estimates of Ho, He, and fixation index (F) are biased. When corrected for null alleles (FNull), the fixation index decreased for all samples, resulting in significantly higher than zero results for seedlings of all populations, but not for juveniles and adults of all populations. The comparison of FNull values between cohorts in the most heavily exploited population (ESP) suggests that inbred individuals are eliminated between seedling and adult stages. Significant SGS was detected up to 60 m in all populations, which indicates short distance seed dispersal. Genetic differentiation (G’ST) between pairwise populations was related to spatial distance between populations, with the greatest difference between more distant populations.
机译:对热带树木物种的遗传研究发现,零散和剥削种群的遗传多样性降低,近交和空间遗传结构(SGS)水平升高的迹象。本文的目的是使用八个微卫星基因座来研究三个经历不同种子收获强度的捕食Orbignya phalerata种群的遗传多样性,结构和种群内SGS。从每个种群中,我们对30棵幼苗,30棵幼树和30棵成年树进行地理定位和采样。所有位点(k),观察到的(H o )和预期杂合性(H e )的等位基因总数对经历更密集水果采摘的人群呈现较低的价值相比未开发的人口较少,这表明收获水果可能会降低遗传多样性。在所有种群的幼苗,幼虫和成虫中几乎所有位点均检测到无效等位基因,这表明H o ,H e 和固定指数(F)的估计值有偏见。如果对无效等位基因(F Null )进行校正,则所有样品的固定指数均降低,从而导致所有种群的幼苗的结果明显高于零,但并非所有种群的未成年和成年种群的结果均高于零。在利用最严重的种群(ESP)中,队列之间的F Null 值的比较表明,在苗期和成年期之间,近交个体被淘汰。在所有种群中均检测到高达60 m的显着SGS,这表明种子在短距离内扩散。成对种群之间的遗传分化(G’ ST )与种群之间的空间距离有关,远处种群之间的差异最大。

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