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

1.木槿属及其近缘种：cpDNA分析表明：i)四个近缘种是从一种种子分流的泛热带植物中形成的：木槿属。ii)在广泛的分布区内证实了种子的远距离传播。iii)美洲大陆两侧的伯南布胡桃独特的遗传多样性，以及仅在大西洋种群中从木槿属的导入。微卫星分析表明：i)在非常广泛的分布范围内频繁的基因流动，和某些地区种群的局部多样性。ii)可能通过花粉通过巴拿马地峡进行基因流动。2.通心菜：AFLP分析表明：i)在形态上被识别的两个亚种(ssp.pe-caprae和ssp.brasiliens)之间存在明显的遗传分离。ii)种群的遗传多样性在美洲大陆的东西部、东太平洋和非洲之间最大，但都低于这两个亚种之间的水平。iii)印度洋和太平洋地区之间没有明显的种群分离，3.加拿大红豆杉：叶绿体基因的系统发育分析表明：i)具有相同的单倍型；ii)红豆杉的单倍型分布于整个海洋地区。4.红豆根：系统发育分析、叶绿体DNA和种群研究表明：i)美洲大陆两侧红豆杉独特的遗传多样性。ii)属于IWP(印度-西太平洋)种的红豆杉具有相同的单倍型分布在太平洋红豆杉种群中。

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.