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Different population size change and migration histories created genetic diversity of three oaks in Tokai region, central Japan
Journal of Plant Research ( IF 2.8 ) Pub Date : 2021-06-21 , DOI: 10.1007/s10265-021-01323-2
Ichiro Tamaki 1 , Tomohiro Obora 1 , Takafumi Ohsawa 2 , Asako Matsumoto 3 , Yoko Saito 4 , Yuji Ide 4
Affiliation  

To understand genetic diversity in focal species, it is important to consider the possibility of speciation with gene flow, especially in species with porous genomes such as oaks. We studied genetic diversity and structure in three oaks, Quercus mongolica var. mongolicoides (QM), Q. mongolica var. crispula (QC) and Q. serrata (QS), growing in the Tokai region, central Japan. QM is semi-endemic to the region while the others are common taxa. We also conducted demographic modeling to infer their population size change and migration histories using an approximate Bayesian computation (ABC) approach. The three taxa showed distinct genetic structures but there was genetic admixture among the taxa, especially between QM and QC. ABC analysis of population size change revealed that the population size of QM was stable during and after the last glacial period, while QC and QS showed population expansion after the last glacial maximum. ABC analysis of population divergence and migration revealed that continuous gene flow between QM and QC after their divergence was supported, while between QM and QS, and between QC and QS, secondary contact after sufficient isolation was supported. These historical migration patterns among the three taxa indicate that QM and QC are currently in the early stage or gray zone of speciation, whereas speciation of the other two taxon pairs is considered to have almost been established. Observed gene flow patterns and strength between QM and QC, and between QM and QS, were explained by both flowering patterns and historical distributions, but those between QC and QS were not.



中文翻译:

不同的种群规模变化和迁徙历史创造了日本中部东海地区三棵橡树的遗传多样性

要了解焦点物种的遗传多样性,重要的是要考虑基因流物种形成的可能性,尤其是在具有多孔基因组的物种中,例如橡树。我们研究了三棵橡树的遗传多样性和结构,蒙古栎变种。mongolicoides (QM), Q. mongolica var. 卷曲(QC) 和Q. serrata(QS),生长在日本中部的东海地区。QM 是该地区的半特有种,而其他是常见的分类群。我们还进行了人口建模,以使用近似贝叶斯计算 (ABC) 方法推断其人口规模变化和迁移历史。三个分类群显示出不同的遗传结构,但分类群之间存在遗传混合,特别是在 QM 和 QC 之间。种群规模变化的ABC分析表明,QM的种群规模在末次冰期和末次冰期后保持稳定,而QC和QS则在末次冰期最大值后出现种群扩张。种群分化和迁移的 ABC 分析表明,在分化后 QM 和 QC 之间的连续基因流动得到支持,而 QM 和 QS 之间,以及 QC 和 QS 之间,支持充分隔离后的二次接触。三个类群之间的这些历史迁移模式表明,QM 和 QC 目前处于物种形成的早期或灰色地带,而其他两个类群对的物种形成被认为几乎已经建立。观察到的 QM 和 QC 之间以及 QM 和 QS 之间的基因流动模式和强度可以通过开花模式和历史分布来解释,但 QC 和 QS 之间的则不然。

更新日期:2021-06-22
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