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Molecular population genetic study for pantropical plants with seadrifted seeds in aspects of their species integration and speciation

泛热带植物漂流种子的物种整合和物种形成分子群体遗传研究

基本信息

批准号：
16370043
负责人：
KAJITA Tadashi
金额：
$ 6.02万
依托单位：
Chiba University
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (B)
财政年份：
2004
资助国家：
日本
起止时间：
2004 至 2006
项目状态：
已结题

项目摘要

1.Hibiscus tiliaceus and its allied species : CpDNA analysis revealed the followings.i)Four allied species were speciated from a pantropical plants with seadrifted seeds : Hibiscus tiliaceus.ii)Long distance seed dispersal are confirmed over the wide distribution area.iii)Distinctive genetic diversification in H.pernambucensis between both side of American Continents, and introgression from H.tiliaceus only in Atlantic populations.Microsatellite analysis revealed the followings:i)Frequent gene flow over very wide distribution range, and local diversification of population in certain areas.ii)Possible gene flow by pollen over the Isthmus of Panama.2.Ipomoea pes-caprae : AFLP analysis suggested the followings:i)Clear genetic segregation between the two subspecies (ssp.pes-caprae and ssp.brasiliensis) that are morphologically recognized.ii)Genetic diversification of population was largest between Eastern and Western part of America continents, following East Pacific, and Africa, but all of them were less than the level between the two subspecies.iii)No clear segregation of population between the Indian Oceanic and Pacific regions, that suggest gene flow via long distance seed dispersal.3.Canavalia rosea : Phylogenetic analysis of chlroplast genes suggested the followings.i)Identical haplotypes were shared among species with sea-drifted seeds.ii)A haplotype of C. rosea distributes over all the oceanic regions.4.Rhizophora mangle : Phylogenetic analysis chloroplast DNA and population studies suggested the followings.i)Distinctive genetic diversification in R. mangle between both side of American Continents.ii)R.samoensis that belongs to IWP (Indo-West Pacific) species has the same haplotype distributed over Pacific populations of R.mangle.

1.木槿及其近缘种：CpDNA分析结果表明：（1）4个近缘种均来自于一种泛热带植物，其种子为海裂种子;（2）在广泛的分布区域内证实了长距离的种子传播;（3）在美洲大陆两侧，微卫星分析结果表明：（1）在很宽的分布范围内存在着频繁的基因流动，在某些地区存在着群体的局部分化;（2）巴拿马地峡地区可能存在花粉的基因流动; AFLP分析结果表明：（1）两亚种间存在明显的遗传分离（2）美洲大陆东部和西部的种群遗传多样性最大，其次是东太平洋和非洲，但都低于两个亚种之间的水平;（3）印度洋和太平洋地区的种群间没有明显的分离，表明基因流是通过远距离种子传播实现的。叶绿体基因的系统发育分析表明：（1）具有海漂种子的物种具有相同的单倍型。4.红丝藻Rhizophora mangle：系统发育分析、叶绿体DNA和种群研究表明：（1）红丝藻Rhizophora mangle具有独特的遗传多样性;（2）属于印度-西太平洋（IWP）种的萨摩亚蛤与太平洋蛤的分布有相同的单倍型。