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Article: Genomic markers reveal introgressive hybridization in the Indo-West Pacific mangroves: A case study

TitleGenomic markers reveal introgressive hybridization in the Indo-West Pacific mangroves: A case study
Authors
Issue Date2011
PublisherPublic Library of Science. The Journal's web site is located at http://www.plosone.org/home.action
Citation
Plos One, 2011, v. 6 n. 5 How to Cite?
AbstractBiodiversity of mangrove ecosystems is difficult to assess, at least partly due to lack of genetic verification of morphology-based documentation of species. Natural hybridization, on the one hand, plays an important role in evolution as a source of novel gene combinations and a mechanism of speciation. However, on the other hand, recurrent introgression allows gene flow between species and could reverse the process of genetic differentiation among populations required for speciation. To understand the dynamic evolutionary consequences of hybridization, this study examines genomic structure of hybrids and parental species at the population level. In the Indo-West Pacific, Bruguiera is one of the dominant mangrove genera and species ranges overlap extensively with one another. Morphological intermediates between sympatric Bruguiera gymnorrhiza and Bruguiera sexangula have been reported as a variety of B. sexangula or a new hybrid species, B. × rhynchopetala. However, the direction of hybridization and extent of introgression are unclear. A large number of species-specific inter-simple sequence repeat (ISSR) markers were found in B. gymnorrhiza and B. sexangula, and the additive ISSR profiling of B. × rhynchopetala ascertained its hybrid status and identified its parental origin. The varying degree of scatterness among hybrid individuals in Principal Coordinate Analysis and results from NewHybrids analysis indicate that B. × rhynchopetala comprises different generations of introgressants in addition to F 1s. High genetic relatedness between B. × rhynchopetala and B. gymnorrhiza based on nuclear and chloroplast sequences suggests preferential hybrid backcrosses to B. gymnorrhiza. We conclude that B. × rhynchopetala has not evolved into an incipient hybrid species, and its persistence can be explained by recurrent hybridization and introgression. Genomic data provide insights into the hybridization dynamics of mangrove plants. Such information can assist in biodiversity assessment by helping detect novel taxa and/or define species boundaries. © 2011 Sun, Lo.
Persistent Identifierhttp://hdl.handle.net/10722/143099
ISSN
2015 Impact Factor: 3.057
2015 SCImago Journal Rankings: 1.395
PubMed Central ID
ISI Accession Number ID
Funding AgencyGrant Number
HKRGCHKU7261/00M
Funding Information:

This research was funded by a HKRGC GRF grant (HKU7261/00M) to M. Sun. (URL:http://www.ugc.edu.hk/eng/rgc/index.htm). The funders had no role in study design, data collection and analysis, decision to publish, or preparation of the manuscript.

References

 

DC FieldValueLanguage
dc.contributor.authorSun, Men_HK
dc.contributor.authorLo, EYYen_HK
dc.date.accessioned2011-10-28T08:40:15Z-
dc.date.available2011-10-28T08:40:15Z-
dc.date.issued2011en_HK
dc.identifier.citationPlos One, 2011, v. 6 n. 5en_HK
dc.identifier.issn1932-6203en_HK
dc.identifier.urihttp://hdl.handle.net/10722/143099-
dc.description.abstractBiodiversity of mangrove ecosystems is difficult to assess, at least partly due to lack of genetic verification of morphology-based documentation of species. Natural hybridization, on the one hand, plays an important role in evolution as a source of novel gene combinations and a mechanism of speciation. However, on the other hand, recurrent introgression allows gene flow between species and could reverse the process of genetic differentiation among populations required for speciation. To understand the dynamic evolutionary consequences of hybridization, this study examines genomic structure of hybrids and parental species at the population level. In the Indo-West Pacific, Bruguiera is one of the dominant mangrove genera and species ranges overlap extensively with one another. Morphological intermediates between sympatric Bruguiera gymnorrhiza and Bruguiera sexangula have been reported as a variety of B. sexangula or a new hybrid species, B. × rhynchopetala. However, the direction of hybridization and extent of introgression are unclear. A large number of species-specific inter-simple sequence repeat (ISSR) markers were found in B. gymnorrhiza and B. sexangula, and the additive ISSR profiling of B. × rhynchopetala ascertained its hybrid status and identified its parental origin. The varying degree of scatterness among hybrid individuals in Principal Coordinate Analysis and results from NewHybrids analysis indicate that B. × rhynchopetala comprises different generations of introgressants in addition to F 1s. High genetic relatedness between B. × rhynchopetala and B. gymnorrhiza based on nuclear and chloroplast sequences suggests preferential hybrid backcrosses to B. gymnorrhiza. We conclude that B. × rhynchopetala has not evolved into an incipient hybrid species, and its persistence can be explained by recurrent hybridization and introgression. Genomic data provide insights into the hybridization dynamics of mangrove plants. Such information can assist in biodiversity assessment by helping detect novel taxa and/or define species boundaries. © 2011 Sun, Lo.en_HK
dc.languageeng-
dc.publisherPublic Library of Science. The Journal's web site is located at http://www.plosone.org/home.actionen_HK
dc.relation.ispartofPLoS ONEen_HK
dc.subject.meshDNA Primers-
dc.subject.meshGenetic Markers-
dc.subject.meshHybridization, Genetic-
dc.subject.meshPolymerase Chain Reaction-
dc.subject.meshRhizophoraceae - genetics-
dc.titleGenomic markers reveal introgressive hybridization in the Indo-West Pacific mangroves: A case studyen_HK
dc.typeArticleen_HK
dc.identifier.openurlhttp://library.hku.hk:4550/resserv?sid=HKU:IR&issn=1932-6203&volume=6&issue=5&spage=e19671&epage=&date=2011&atitle=Genomic+markers+reveal+introgressive+hybridization+in+the+Indo-West+Pacific+mangroves:+a+case+study-
dc.identifier.emailSun, M: meisun@hkucc.hku.hken_HK
dc.identifier.authoritySun, M=rp00779en_HK
dc.description.naturepublished_or_final_version-
dc.identifier.doi10.1371/journal.pone.0019671en_HK
dc.identifier.pmid21589927-
dc.identifier.pmcidPMC3092761-
dc.identifier.scopuseid_2-s2.0-79955887108en_HK
dc.identifier.hkuros185536-
dc.relation.referenceshttp://www.scopus.com/mlt/select.url?eid=2-s2.0-79955887108&selection=ref&src=s&origin=recordpageen_HK
dc.identifier.volume6en_HK
dc.identifier.issue5en_HK
dc.identifier.spagee19671-
dc.identifier.epagee19671-
dc.identifier.eissn1932-6203-
dc.identifier.isiWOS:000290483600020-
dc.publisher.placeUnited Statesen_HK
dc.identifier.scopusauthoridSun, M=7403181447en_HK
dc.identifier.scopusauthoridLo, EYY=18437505900en_HK
dc.identifier.citeulike11195208-

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