Intraspecific genetic divergence of the subalpine shrubby variety Quercus crispula var. horikawae from the mountain tree variety Q. crispula var. crispula in Japan

IF 1.1 4区 生物学 Q4 ECOLOGY
Lerma San Jose-Maldia, Asako Matsumoto, Teruyoshi Nagamitsu, Saneyoshi Ueno, Yoshihiko Tsumura
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Abstract

Ecotypic divergence in tree taxa often occurs in subalpine habitats, where environmental conditions are more stressful than those in lower elevations. In the white oak species in Japan Quercus crispula, the subalpine shrubby variety Q. crispula var. horikawae (Qch) has been recognized in central and northern Honshu. Although Qch has different phenotypes from Q. crispula var. crispula (Qcc), genetic divergence between Qcc and Qch has not been examined yet. Pairs of Qcc and Qch populations in eight locations and additional Qcc and Qch populations around these locations were investigated. Leaf size of Qch was smaller than that of Qcc. Chloroplast DNA haplotypes were shared between the Qcc and Qch populations. In genotypes at 29 nuclear microsatellite loci, genetic diversity did not differ between the Qcc and Qch populations. Principal component analysis and a neighbor-joining tree of populations based on the genotypes demonstrated that 13 Qcc populations and eight Qch populations were grouped separately, except for three Qch populations that were grouped to Qcc. Climatic conditions in the eight Qch populations were characterized by lower temperature and heavier snowfall than those in the 16 populations of the genetic group of Qcc. These results suggest genetic divergence between Qcc and Qch associated with subalpine climatic conditions, irrespective of leaf size. The origin of the subalpine Qch lineage and the history of ecotypic divergence should be investigated in future genomic studies.

Abstract Image

日本亚高山灌木变种柞树(Quercus crispula var. horikawae)与山地乔木变种柞树(Q. crispula var. crispula)的种内遗传差异
树木类群的生态型分化通常发生在亚高山栖息地,那里的环境条件比海拔较低的地方更为恶劣。在日本的白栎树种 Qercus crispula 中,亚高山灌木变种 Q. crispula var. horikawae(Qch)已在本州中部和北部得到确认。虽然 Qch 与 Q. crispula var. crispula(Qcc)的表型不同,但尚未研究 Qcc 与 Qch 之间的遗传分化。研究人员对八个地点的 Qcc 和 Qch 种群配对以及这些地点周围的 Qcc 和 Qch 种群进行了调查。Qch 的叶片比 Qcc 小。Qcc 和 Qch 群体共享叶绿体 DNA 单倍型。在 29 个核微卫星位点的基因型中,Qcc 和 Qch 群体的遗传多样性没有差异。主成分分析和基于基因型的种群相邻连接树表明,除三个 Qch 种群归入 Qcc 外,13 个 Qcc 种群和 8 个 Qch 种群分别归为一组。与 Qcc 基因组的 16 个居群相比,8 个 Qch 居群的气候条件具有温度低、降雪量大的特点。这些结果表明,Qcc 和 Qch 之间的遗传分化与亚高山气候条件有关,与叶片大小无关。亚高山Qch品系的起源和生态型分化的历史应在未来的基因组研究中加以研究。
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来源期刊
Plant Species Biology
Plant Species Biology 生物-生态学
CiteScore
2.70
自引率
14.30%
发文量
36
审稿时长
>12 weeks
期刊介绍: Plant Species Biology is published four times a year by The Society for the Study of Species Biology. Plant Species Biology publishes research manuscripts in the fields of population biology, pollination biology, evolutionary ecology, biosystematics, co-evolution, and any other related fields in biology. In addition to full length papers, the journal also includes short research papers as notes and comments. Invited articles may be accepted or occasion at the request of the Editorial Board. Manuscripts should contain new results of empirical and/or theoretical investigations concerning facts, processes, mechanisms or concepts of evolutionary as well as biological phenomena. Papers that are purely descriptive are not suitable for this journal. Notes & comments of the following contents will not be accepted for publication: Development of DNA markers. The journal is introducing ''Life history monographs of Japanese plant species''. The journal is dedicated to minimizing the time between submission, review and publication and to providing a high quality forum for original research in Plant Species Biology.
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