Genetic differentiation in Elaeocarpus photiniifolia (Elaeocarpaceae) associated with geographic distribution and habitat variation in the Bonin (Ogasawara) Islands
Genetic differentiation in Elaeocarpus photiniifolia (Elaeocarpaceae) associated with geographic distribution and habitat variation in the Bonin (Ogasawara) Islands
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DOI：
10.1007/s10265-013-0571-5
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发表时间：
2013-11-01
影响因子：
2.8
通讯作者：
Yoshimaru, Hiroshi
中科院分区：
文献类型：
--
作者：
Sugai, Kyoko;Setsuko, Suzuki;Yoshimaru, Hiroshi
不同环境条件下的种群间的基因流动由于不同的自然选择而受到限制，从而促进了遗传分化。光叶杜英（Elaeocarpus photiniifolia）是小笠原群岛的一种特有树种，分布于两种类型的生境中，即干燥灌丛和中生林。本文旨在阐明E. Photiniifolia内和岛屿之间和栖息地类型之间。对19个群体的639个个体进行了基因型调查。photiniifolia及其近缘种E.来自表达序列标签的24个微卫星位点。结果表明：（1）E. photiniifolia和E.樟子松（0.307a千分之F（ST）a千分之0.470）;小笠原群岛七岛岛群和八岛岛群的phytiniifolia种群（0.033 a千分之一货币符号F（ST）a千分之一货币符号0.121）;与千岛岛群的干燥灌木和梅西奇森林相关的photiniifolia种群（0.005 a千分之一货币符号F（ST）a千分之一货币符号0.071）。主坐标分析和贝叶斯聚类分析也表明，遗传上不同的群体与生境类型，距离隔离不是负责的遗传分化。这些结果表明，E.在小笠原群岛，photiniifolia被分成与不同环境条件相关的遗传分化组。
Gene flow between populations in different environmental conditions can be limited due to divergent natural selection, thus promoting genetic differentiation. Elaeocarpus photiniifolia, an endemic tree species in the Bonin Islands, is distributed in two types of habitats, dry scrubs and mesic forests. We aim to elucidate the genetic differentiation in E. photiniifolia within and between islands and between the habitat types. We investigated genotypes of 639 individuals from 19 populations of E. photiniifolia and its closely-related E. sylvestris at 24 microsatellite loci derived from expressed sequence tags. The data revealed genetic differentiation (1) between E. photiniifolia and E. sylvestris (0.307 a parts per thousand currency sign F (ST) a parts per thousand currency sign 0.470), (2) between the E. photiniifolia populations of the Chichijima and Hahajima Island Groups in the Bonin Islands (0.033 a parts per thousand currency sign F (ST) a parts per thousand currency sign 0.121) and (3) between E. photiniifolia populations associated with dry scrubs and mesic forests in the Chichijima Island Group (0.005 a parts per thousand currency sign F (ST) a parts per thousand currency sign 0.071). Principal coordinate analysis and Bayesian clustering analysis also showed that genetically distinct groups were associated with the habitat types, and isolation by distance was not responsible for the genetic differentiation. These findings suggest that E. photiniifolia is divided into genetically differentiated groups associated with different environmental conditions in the Bonin Islands.