Generic phylogeny, historical biogeography and character evolution of the cosmopolitan aquatic plant family Hydrocharitaceae.
Generic phylogeny, historical biogeography and character evolution of the cosmopolitan aquatic plant family Hydrocharitaceae.
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世界性水生植物水鳖科的系统发育、历史生物地理学和性状演化
DOI：
10.1186/1471-2148-12-30
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发表时间：
2012-03-10
影响因子：
3.4
通讯作者：
Wang QF
中科院分区：
文献类型：
--
作者：
Chen LY;Chen JM;Gituru RW;Wang QF
水螅科是一个完全水生的单子叶植物科，由18属约120种组成。该家族包括新鲜和海洋水生动物，在形式和习惯上表现出极大的多样性，包括一年生和多年生的生活史；浸没的，部分浸没的和漂浮的叶片习性和线性到圆形的叶片形状。该科具有世界性分布，在欧洲第三纪化石记录中有很好的代表性。目前，对该科的历史生物地理学认识尚不清楚，属类关系仍存在争议。本研究通过整合化石和8个基因的DNA序列，对水螅科植物的系统发育和生物地理进行了研究。我们还对三个形态特征进行了祖先状态重建。结果系统发育分析显示，大多数分支的系统发育得到了bootstrap值大于95和贝叶斯后验概率值为1.0的强烈支持。stratiosis：第一个分化的谱系，其余属分为两个分支，一个分支包括flagarosiphon、Ottelia、Blyxa、Apalanthe、elodeaia和degeria；另一种由hydrocharis - limnobium、Thalassia、Enhalus、Halophila、Najas、Hydrilla、Vallisneria、nechamandraa和maidenia组成。生物地理分析（DIVA, Mesquite）和分化时间估计（BEAST）确定了水龙科最近的共同祖先在晚白垩世和古新世（54.7-72.6 Ma）出现在亚洲。分散（包括通过特提斯海道和陆桥的远距离分散和迁徙）可能在这个科的洲际分布中起了主要作用。祖先状态重建表明，水莲科植物雌雄异株的进化是双向的，即从雌雄异株到雌雄同体，从雌雄同体到雌雄异株，而叶片的空沉习性和短线形是其祖先状态。结论sour的研究揭示了此前存在争议的水螅科属系统发育问题。该研究解决了这一科的历史生物地理学问题，并支持将分散作为洲际分布的最可能解释。这也为了解水生单子叶植物的繁殖系统和叶片表型的进化提供了有价值的信息。
BackgroundHydrocharitaceae is a fully aquatic monocot family, consists of 18 genera with approximately 120 species. The family includes both fresh and marine aquatics and exhibits great diversity in form and habit including annual and perennial life histories; submersed, partially submersed and floating leaf habits and linear to orbicular leaf shapes. The family has a cosmopolitan distribution and is well represented in the Tertiary fossil record in Europe. At present, the historical biogeography of the family is not well understood and the generic relationships remain controversial. In this study we investigated the phylogeny and biogeography of Hydrocharitaceae by integrating fossils and DNA sequences from eight genes. We also conducted ancestral state reconstruction for three morphological characters.ResultsPhylogenetic analyses produced a phylogeny with most branches strongly supported by bootstrap values greater than 95 and Bayesian posterior probability values of 1.0.Stratiotesis the first diverging lineage with the remaining genera in two clades, one clade consists ofLagarosiphon, Ottelia, Blyxa, Apalanthe, ElodeaandEgeria; and the other consists ofHydrocharis-Limnobium, Thalassia, Enhalus, Halophila, Najas, Hydrilla, Vallisneria, NechamandraandMaidenia. Biogeographic analyses (DIVA, Mesquite) and divergence time estimates (BEAST) resolved the most recent common ancestor of Hydrocharitaceae as being in Asia during the Late Cretaceous and Palaeocene (54.7-72.6 Ma). Dispersals (including long-distance dispersal and migrations through Tethys seaway and land bridges) probably played major roles in the intercontinental distribution of this family. Ancestral state reconstruction suggested that in Hydrocharitaceae evolution of dioecy is bidirectional, viz., from dioecy to hermaphroditism, and from hermaphroditism to dioecy, and that the aerial-submerged leaf habit and short-linear leaf shape are the ancestral states.ConclusionsOur study has shed light on the previously controversial generic phylogeny of Hydrocharitaceae. The study has resolved the historical biogeography of this family and supported dispersal as the most likely explanation for the intercontinental distribution. We have also provided valuable information for understanding the evolution of breeding system and leaf phenotype in aquatic monocots.
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影响因子：
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