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由于近邻授粉，植物种群中的纯合性和斑块结构。

Homozygosity and patch structure in plant populations as a result of nearest-neighbor pollination.

机构信息

Department of Molecular and Population Genetics, University of Georgia, Athens, Georgia 30602.

出版信息

Proc Natl Acad Sci U S A. 1982 Jan;79(1):203-7. doi: 10.1073/pnas.79.1.203.

DOI:10.1073/pnas.79.1.203
PMID:16593140
原文链接:https://pmc.ncbi.nlm.nih.gov/articles/PMC345691/
Abstract

The population genetic consequences of nearest-neighbor pollination in an outcrossing plant species were investigated through computer simulations. The genetic system consisted of two alleles at a single locus in a self-incompatible plant that mates by random pollen transfer from a neighboring individual. Beginning with a random distribution of genotypes, restricted pollen and seed dispersal were applied each generation to 10,000 individuals spaced uniformly on a square grid. This restricted gene flow caused inbreeding, a rapid increase in homozygosity, and striking microgeographic differentiation of the populations. Patches of homozygotes bordered by heterozygotes formed quickly and persisted for many generations. Thus, high levels of inbreeding, homozygosity, and patchiness in the spatial distribution of genotypes are expected in plant populations with breeding systems based on nearest-neighbor pollination, and such observations require no explanation by natural selection or other deterministic forces.

摘要

通过计算机模拟研究了异交植物中近亲授粉的种群遗传后果。遗传系统由自交不亲和植物中一个单一基因座的两个等位基因组成，通过来自邻近个体的随机花粉转移进行交配。从基因型的随机分布开始，每一代对均匀分布在正方形网格上的 10000 个个体进行限制花粉和种子的扩散。这种受限的基因流导致了近亲繁殖、杂合子快速增加以及种群的显著微观地理分化。由杂合子包围的纯合子斑块很快形成，并持续了许多代。因此，基于近亲授粉的繁殖系统的植物种群中，预计会出现高水平的近亲繁殖、纯合子和基因型空间分布的斑块化，而这些观察结果无需通过自然选择或其他确定性力量来解释。

https://cdn.ncbi.nlm.nih.gov/pmc/blobs/f4bb/345691/044da3b783ab/pnas00440-0229-i.jpg
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https://cdn.ncbi.nlm.nih.gov/pmc/blobs/f4bb/345691/c845085420ed/pnas00440-0228-a.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/f4bb/345691/a6b8c3f71d94/pnas00440-0228-b.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/f4bb/345691/ec0c448ff424/pnas00440-0228-c.jpg
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https://cdn.ncbi.nlm.nih.gov/pmc/blobs/f4bb/345691/18c951fd36ef/pnas00440-0228-g.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/f4bb/345691/75c6d7727599/pnas00440-0228-h.jpg
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https://cdn.ncbi.nlm.nih.gov/pmc/blobs/f4bb/345691/2710c374a55b/pnas00440-0229-c.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/f4bb/345691/fca6e1aa18e9/pnas00440-0229-d.jpg
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https://cdn.ncbi.nlm.nih.gov/pmc/blobs/f4bb/345691/044da3b783ab/pnas00440-0229-i.jpg

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