Molecular phylogenetic geography of pan tropic sea dispersed plants

泛热带海洋分散植物的分子系统发育地理学

• 批准号: 12575011
• 负责人: TATEICHI Yoichi
• 金额: $ 6.46万
• 依托单位: University of the Ryukyus
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for Scientific Research (B)
• 财政年份: 2000
• 资助国家: 日本
• 起止时间: 2000 至 2001
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/en/grant/KAKENHI-PROJECT-12575011/
• 关键词: Pan tropic species; sea current dispersal; molecular phylogenetic geography; dispersion; disruption; genetic interchange; Ipomoea pes-caprae; Canavalia rosea

Among the pan tropic plants there are many sea current dispersed species. For land plants the oceans act as geographical barriers to disperse, but help dispersal of those sea current dispersed plants and progress the interchange of genes between their populations. The purposes of this work are 1) to know to what extent the genetic interchanges are occurred between the pan tropically distributed species which cover such a wide range round the world. 2) To discuss the origin of sea current dispersal plants.We searched native populations of typically pan tropic species, Ipomoea pes-caprae and Canavalia rosea in coastal regions of the Pacific, Atlantic and Indian Oceans, and made population sampling of them. As a result we could cover almost their distribution area. At their populations we collected dried leaf samples for DNA analysis, dried specimens, flower specimens fixed in FAA and seeds.In I. pes-caprae there was no variation of the sequences of the regions of CPDNA examined between all the populations. It suggests I. pes-caprae frequently immigrates between populations. On the other hand, there are many variations of the sequences of the third intron of dihydrofavonol 4-reductase (DFR-B) of I. pes-caprae. This indicates that the genetic differentiations occur among populations, especially between the Pacific, Atlantic and Indian oceans.Expansions of some sea current species, Hibiscus tiliaceus, Canavalia rosea, Mucuna gigantea by sea were discussed. Sea drifted seeds and fruits on the coastal regions of the Ryukyu archipelago were identified and their sea dispersal ability were discussed.

在泛热带植物中，有许多海流分散种。对于陆地植物来说，海洋是地理上的屏障，阻碍了它们的扩散，但同时也帮助了那些被海流分散的植物的扩散，并促进了它们种群之间基因的交换。本研究的目的是：(1)了解分布在世界各地如此广泛的泛热带物种之间发生了多大程度的遗传交换。2)探讨海流扩散植物的起源。我们在太平洋、大西洋和印度洋沿海地区搜索了典型的泛热带物种Ipomoea pes-caprae和Canavalia rosea的本地种群，并对它们进行了种群抽样。因此，我们几乎可以覆盖他们的销售区域。在它们的种群中，我们收集了用于DNA分析的干燥叶片样本、干燥标本、固定在FAA中的花标本和种子。在所有种群中，所检测的CPDNA区域序列没有变化。这表明猿猴经常在种群之间迁徙。另一方面，双氢蚕豆醇4还原酶（DFR-B）第三内含子的序列存在许多变异。这表明种群间存在遗传差异，特别是在太平洋、大西洋和印度洋之间。讨论了一些海流物种，如芙蓉、玫瑰芥、巨型麻豆在海上的扩张。对琉球群岛沿海地区的海上漂流种子和果实进行了鉴定，并讨论了它们的海上扩散能力。