Generic phylogeny, historical biogeography and character evolution of the cosmopolitan aquatic plant family Hydrocharitaceae
Identifieur interne : 000487 ( Pmc/Curation ); précédent : 000486; suivant : 000488Generic phylogeny, historical biogeography and character evolution of the cosmopolitan aquatic plant family Hydrocharitaceae
Auteurs : Ling-Yun Chen [République populaire de Chine] ; Jin-Ming Chen [République populaire de Chine] ; Robert Wahiti Gituru [Kenya] ; Qing-Feng Wang [République populaire de Chine]Source :
- BMC Evolutionary Biology [ 1471-2148 ] ; 2012.
Abstract
Hydrocharitaceae 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.
Phylogenetic analyses produced a phylogeny with most branches strongly supported by bootstrap values greater than 95 and Bayesian posterior probability values of 1.0.
Our 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.
Url:
DOI: 10.1186/1471-2148-12-30
PubMed: 22404786
PubMed Central: 3317846
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<front><div type="abstract" xml:lang="en"><sec><title>Background</title>
<p>Hydrocharitaceae 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.</p>
</sec>
<sec><title>Results</title>
<p>Phylogenetic analyses produced a phylogeny with most branches strongly supported by bootstrap values greater than 95 and Bayesian posterior probability values of 1.0. <italic>Stratiotes </italic>
is the first diverging lineage with the remaining genera in two clades, one clade consists of <italic>Lagarosiphon, Ottelia, Blyxa, Apalanthe, Elodea </italic>
and <italic>Egeria</italic>
; and the other consists of <italic>Hydrocharis</italic>
-<italic>Limnobium, Thalassia, Enhalus, Halophila, Najas, Hydrilla, Vallisneria, Nechamandra </italic>
and <italic>Maidenia</italic>
. 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.</p>
</sec>
<sec><title>Conclusions</title>
<p>Our 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.</p>
</sec>
</div>
</front>
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<pmc article-type="research-article"><pmc-dir>properties open_access</pmc-dir>
<front><journal-meta><journal-id journal-id-type="nlm-ta">BMC Evol Biol</journal-id>
<journal-id journal-id-type="iso-abbrev">BMC Evol. Biol</journal-id>
<journal-title-group><journal-title>BMC Evolutionary Biology</journal-title>
</journal-title-group>
<issn pub-type="epub">1471-2148</issn>
<publisher><publisher-name>BioMed Central</publisher-name>
</publisher>
</journal-meta>
<article-meta><article-id pub-id-type="pmid">22404786</article-id>
<article-id pub-id-type="pmc">3317846</article-id>
<article-id pub-id-type="publisher-id">1471-2148-12-30</article-id>
<article-id pub-id-type="doi">10.1186/1471-2148-12-30</article-id>
<article-categories><subj-group subj-group-type="heading"><subject>Research Article</subject>
</subj-group>
</article-categories>
<title-group><article-title>Generic phylogeny, historical biogeography and character evolution of the cosmopolitan aquatic plant family Hydrocharitaceae</article-title>
</title-group>
<contrib-group><contrib contrib-type="author" id="A1"><name><surname>Chen</surname>
<given-names>Ling-Yun</given-names>
</name>
<xref ref-type="aff" rid="I1">1</xref>
<xref ref-type="aff" rid="I2">2</xref>
<xref ref-type="aff" rid="I3">3</xref>
<email>lychen83@qq.com</email>
</contrib>
<contrib contrib-type="author" id="A2"><name><surname>Chen</surname>
<given-names>Jin-Ming</given-names>
</name>
<xref ref-type="aff" rid="I1">1</xref>
<xref ref-type="aff" rid="I2">2</xref>
<email>jmchen@wbgcas.cn</email>
</contrib>
<contrib contrib-type="author" id="A3"><name><surname>Gituru</surname>
<given-names>Robert Wahiti</given-names>
</name>
<xref ref-type="aff" rid="I4">4</xref>
<email>wahitigituru@yahoo.com</email>
</contrib>
<contrib contrib-type="author" corresp="yes" id="A4"><name><surname>Wang</surname>
<given-names>Qing-Feng</given-names>
</name>
<xref ref-type="aff" rid="I1">1</xref>
<xref ref-type="aff" rid="I2">2</xref>
<email>qfwang@wbgcas.cn</email>
</contrib>
</contrib-group>
<aff id="I1"><label>1</label>
CAS Key Laboratory of Aquatic Botany and Watershed Ecology, Chinese Academy of Sciences, Wuhan 430074, Hubei, P. R. China</aff>
<aff id="I2"><label>2</label>
Wuhan Botanical Garden, Chinese Academy of Sciences, Wuhan 430074, Hubei, P. R. China</aff>
<aff id="I3"><label>3</label>
Graduate University of Chinese Academy of Sciences, 100049 Beijing, China</aff>
<aff id="I4"><label>4</label>
Botany Department, Jomo Kenyatta University of Agriculture and Technology, P. O. Box 62000-00200, Nairobi, Kenya</aff>
<pub-date pub-type="collection"><year>2012</year>
</pub-date>
<pub-date pub-type="epub"><day>10</day>
<month>3</month>
<year>2012</year>
</pub-date>
<volume>12</volume>
<fpage>30</fpage>
<lpage>30</lpage>
<history><date date-type="received"><day>4</day>
<month>1</month>
<year>2012</year>
</date>
<date date-type="accepted"><day>10</day>
<month>3</month>
<year>2012</year>
</date>
</history>
<permissions><copyright-statement>Copyright ©2012 Chen et al; licensee BioMed Central Ltd.</copyright-statement>
<copyright-year>2012</copyright-year>
<copyright-holder>Chen et al; licensee BioMed Central Ltd.</copyright-holder>
<license license-type="open-access" xlink:href="http://creativecommons.org/licenses/by/2.0"><license-p>This is an Open Access article distributed under the terms of the Creative Commons Attribution License (<ext-link ext-link-type="uri" xlink:href="http://creativecommons.org/licenses/by/2.0">http://creativecommons.org/licenses/by/2.0</ext-link>
), which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.</license-p>
</license>
</permissions>
<self-uri xlink:href="http://www.biomedcentral.com/1471-2148/12/30"></self-uri>
<abstract><sec><title>Background</title>
<p>Hydrocharitaceae 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.</p>
</sec>
<sec><title>Results</title>
<p>Phylogenetic analyses produced a phylogeny with most branches strongly supported by bootstrap values greater than 95 and Bayesian posterior probability values of 1.0. <italic>Stratiotes </italic>
is the first diverging lineage with the remaining genera in two clades, one clade consists of <italic>Lagarosiphon, Ottelia, Blyxa, Apalanthe, Elodea </italic>
and <italic>Egeria</italic>
; and the other consists of <italic>Hydrocharis</italic>
-<italic>Limnobium, Thalassia, Enhalus, Halophila, Najas, Hydrilla, Vallisneria, Nechamandra </italic>
and <italic>Maidenia</italic>
. 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.</p>
</sec>
<sec><title>Conclusions</title>
<p>Our 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.</p>
</sec>
</abstract>
<kwd-group><kwd>Hydrocharitaceae</kwd>
<kwd>Phylogeny</kwd>
<kwd>Historical biogeography</kwd>
<kwd>Dispersal</kwd>
<kwd>Vicariance</kwd>
<kwd>Morphological character evolution</kwd>
</kwd-group>
</article-meta>
</front>
</pmc>
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