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Phylogeographic analysis on the disjunct distribution of rare vascular plants of the Ryukyus

琉球珍稀维管束植物间断分布的系统发育地理学分析

基本信息

批准号：
17570083
负责人：
YOKOTA Masatsugu
金额：
$ 2.08万
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 (C)
财政年份：
2005
资助国家：
日本
起止时间：
2005 至 2007
项目状态：
已结题

来源：
https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-17570083/
关键词：
the Ryukyu Archipelago disjunct distribution Cycas revoluta Ophiopogon reversus Ophiorrhiza japonica var. amamiana Oxygyne shinzatoi Lonicera japonica var. miyagusukiana Ligustrum tamakii 核型サツマイナモリサツマイナモリ属シソクサ属ヤブラン属ノシラン属ス

项目摘要

We confirmed the variation of seed morphology in Cycas revoluta (Cycadaceae) of the Ryukyus, however, variation in seed morphology had no geographical tendency and we could not recognize any interspecific taxa in C. revoluta based on seed morphology.Karyotypes of Ophiopogon reversus (Convallariaceae) collected from four localities in Taiwan and one locality on Yonaguni-jima Island in the southern Ryukyus were reported for the first time. The karyotype of O. reversus was different from O. jaburan in having one pair of short submedian chromosomes with secondary constrictions at the proximal region of the long arms.We examined the floral morph of tetraploid Ophiorrhiza japonica var. amamiana and diploid O. japonica var. japonica (Rubiaceae) to elucidate the association of distyly and ploidy levels. Chloroplast DNA phylogeny was reconstructed to determine the number of tetraploidization events and floral morph shifts in O. japonica. In cpDNA sequencing analysis, no haplotype was shared bet … More ween the two varieties. The cpDNA hap lotype network displayed the monophyly of O. japonica var. amamiana, suggesting a single origin of this variety. Because O. japonica var. amamiana having the morphological and cytological entity is recognized as a single lineage and clearly separated from O. japonica var. japonica, this variety can be considered to be a distinct species.Hayataella (Rubiaceae) is a monotypic genus endemic to Taiwan that comprises H. michelloides. To elucidate the systematic treatment of Hayataella, molecular phylogenetic analyses based on nrDNA and cpDNA were conducted with four Ophiorrhiza species. In the Bayesian and the most parsimonious trees, H. michelloides was included in the Ophiorrhiza clade. The monotypic status of Hayataella is, therefore, not considered appropriate, and the combination Ophiorrhiza michelloides is supported.The chromosome characteristics and molecular phylogenetic position of Oxygyne shinzatoi (Burmanniaceae) endemic to Okinawa Island were studied. The basic chromosome number of the genus was thought to be x=9. Based on the 18S rDNA sequence, O. shinzatoi was consistently found to belong to the monophyletic group of tribe Thismieae. Distance analysis from the most recent common ancestor indicated that O. shinzatoi had the lowest substitution rate among the species of tribe Thismieae. Combined with the basic chromosome numbers and the substitution rate characteristics, O. shinzatoi can be considered to be one of the basal taxon of tribe Thismieae. Less

我们确认了琉球苏铁属(苏铁科)种子形态的变异，但种子形态变异没有地理倾向性，根据种子形态不能识别出任何种间分类群。首次报道了采自台湾4个地点和琉球南部与那古岛的1个地点的麦冬核型。四倍体麦冬的核型与普通麦冬不同，在长臂的近端有一对短的亚正中染色体，具有次生皱缩。Amamiana和二倍体日本野生稻(O.jingonica var.)JAPONICA(茜草科)，以阐明逆倍性和倍性水平之间的关系。通过构建叶绿体DNA系统发育树来确定四倍化事件的数量和花器形态的变化。在cpDNA测序分析中，没有单倍型比…共享更多的是这两个品种之间的差异。CpDNA HAP表型网络显示了日本野生稻的单系性。Amamiana，暗示这一变种的单一起源。因为日本野生稻是一种新的变种。具有形态和细胞学实体的菊科植物被认为是一个单一的谱系，并与日本野生稻明显分开。Hayataella(茜草科)是台湾特有的单型属，含有胶状藻。为了阐明草莓属植物的系统发育机制，采用基于nrDNA和cpDNA的分子系统发育分析方法，对蛇舌草属4个种进行了系统发育分析。在贝叶斯乔木和最节俭的乔木中，麦冬被归入蛇床子支系。研究了冲绳岛特有的尖瓣棘豆(Burmanniaceae)的染色体特征和分子系统发育地位。该属的基本染色体数目为x=9。根据18S rDNA序列，Shinzatoi始终属于Thismieae部族的单系群。距离最近的共同祖先的距离分析表明，在Thismieae部落的物种中，Shinzatoi的替换率最低。结合基本染色体数目和代换率特征，可以认为它是天南星族的基本分类群之一。较少