Trans-species shared polymorphisms at orthologous nuclear gene loci among distant species in the conifer Picea (Pinaceae):: Implications for the long-term maintenance of genetic diversity in trees
Trans-species shared polymorphisms at orthologous nuclear gene loci among distant species in the conifer Picea (Pinaceae):: Implications for the long-term maintenance of genetic diversity in trees
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DOI：
10.3732/ajb.92.1.63
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发表时间：
2005-01-01
影响因子：
3
通讯作者：
Bousquet, J
中科院分区：
文献类型：
--
作者：
Bouillé, M;Bousquet, J
对于三个核 Pile 基因座中的每一个。在云杉属三个远缘物种的 UNA 中检测到种内和反式特异性共享多态性。观察到很少固定的种间多态性。等位基因谱系与物种系统发育不匹配。并且物种谱系并不具有相互的单系关系。基于分子钟和化石记录的形态证据。物种之间的分化时间估计为 13-2000 万年（my）。 a，估计每年每个位点的突变率为 2.23 X 10(-11) 至 3.42 X 10(-10)。推断出历史人口规模超过 100000，这会延迟多态性的确定。这些数字转化为等位基因合并时间约为 10 至 18 my，这意味着自共同祖先以来共享多态性。这些结果表明跨种共享的无定形现象可能在植物核基因位点上很常见。导致高等位基因多样性。这种趋势更有可能出现在具有有利于种群规模较大的生态和生活史决定因素的树木和植物中，例如异型交配、风授粉以及在生态系统中的主导地位。这些多鸟也需要谨慎估计。来自此类植物类群核基因序列的同源物种系统发育。
For each of three nuclear Pile loci. intraspecific- as well as trans-specific shared polymorphisms were detected in UNA among three distantly related species in the genus Picea. Few fixed interspecific polymorphisms were observed. Allele genealogies did not match species phylogenies. and species lineages were not reciprocally rnonophyletic. Based on molecular clocks and morphological evidence from the fossil record. the divergence time between species was estimated at 13-20 million years (my). and a, mutation rate of 2.23 X 10(-11) to 3.42 X 10(-10) per site per year was estimated. Large historical population sizes in excess of 100000 were inferred, which would have delayed the fixation of polymorphisms. These numbers translated into allele coalescence times in the order of 10 to 18 my, which implies the sharing of polymorphisms since common ancestry. These results suggest that transpecific shared Amorphisms might be frequent at plant nuclear gene loci. leading to high allelic diversity. Such a trend is more likely in trees and plants characterized by ecological and life-history determinants favoring large population sizes Such as an outcrossing mating wind pollination, and a dominant position in ecosystem. These polyniorphisnis also call for caution in estimating. congernic Species phylogenies from nuclear gene sequences in Such plant groups.