岛屿环境中的可育橡树：I。结果表明，Q. alnifolia和Q. coccifera在塞浦路斯多人群研究
Interfertile oaks in an island environment: I. High nuclear genetic differentiation and high degree of chloroplast DNA sharing between Q. alnifolia and Q. coccifera in Cyprus. A multipopulation study
摘要：
常绿栎属（Quercus alnifolia）和栎属（Q. coccifera形成唯一的一对在塞浦路斯生长的橡树品种。这两个物种之间的杂交已经被观察和形态学研究。然而，很少有证据存在的遗传渗入的程度。本研究旨在研究渐渗杂交对叶绿体和核基因组的影响。我们对Q. alnifolia和Q.来自塞浦路斯分布区的几个地点的球虫。本研究利用基于核微卫星的分子方差分析（AMOVA）技术，分析了种内和种间的遗传变异。群体遗传结构和水平的混合物进行了研究，通过贝叶斯分析（结构模拟分析）。叶绿体DNA微卫星被用于遗传障碍的空间分析。核遗传变异的主要部分被解释为种组划分。无论是纯居群还是混居群，种间分化程度较高，核基因组混合程度较低，这都支持栎属间有限的遗传渐渗。alnifolia和Q. coccifera在塞浦路斯相反，叶绿体DNA单倍型共享的物种之间，并建议细胞质渐渗的本地结构。偶然的杂交事件，随后与两个亲本物种回交可能会导致这种遗传分化的模式。
英文摘要：
The evergreen Quercus alnifolia and Q. coccifera form the only interfertile pair of oak species growing in Cyprus. Hybridization between the two species has already been observed and studied morphologically. However, little evidence exists about the extent of genetic introgression. In the present study, we aimed to study the effects of introgressive hybridization mutually on both chloroplast and nuclear genomes. We sampled both pure and mixed populations of Q. alnifolia and Q. coccifera from several locations across their distribution area in Cyprus. We analyzed the genetic variation within and between species by conducting Analysis of Molecular Variance (AMOVA) based on nuclear microsatellites. Population genetic structure and levels of admixture were studied by means of a Bayesian analysis (STRUCTURE simulation analysis). Chloroplast DNA microsatellites were used for a spatial analysis of genetic barriers. The main part of the nuclear genetic variation was explained by partition into species groups. High interspecific differentiation and low admixture of nuclear genomes, both in pure and mixed populations, support limited genetic introgression between Q. alnifolia and Q. coccifera in Cyprus. On the contrary, chloroplast DNA haplotypes were shared between the species and were locally structured suggesting cytoplasmic introgression. Occasional hybridization events followed by backcrossings with both parental species might lead to this pattern of genetic differentiation.
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