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Article: A plastid DNA phylogeny of Dasymaschalon (Annonaceae) and allied genera: Evidence for generic non-monophyly and the parallel evolutionary loss of inner petals

TitleA plastid DNA phylogeny of Dasymaschalon (Annonaceae) and allied genera: Evidence for generic non-monophyly and the parallel evolutionary loss of inner petals
Authors
KeywordsAnnonaceae
Character evolution
Dasymaschalon
Flower morphology
Friesodielsia
Phylogeny
Issue Date2012
PublisherInternational Association for Plant Taxonomy. The Journal's web site is located at http://www.iapt-taxon.org/
Citation
Taxon, 2012, v. 61 n. 3, p. 545-558 How to Cite?
Abstract
Dasymaschalon and the closely related genera Desmos, Friesodielsia and Monanthotaxis together comprise ca. 170 species of trees, shrubs and woody climbers distributed in tropical Africa and tropical Asia. These genera form the desmoid clade, which, because of the presence of diverse flower and fruit syndromes including different types of pollination chambers and moniliform monocarps, offers an opportunity to investigate potentially ecologically significant shifts in flower and fruit characters. Despite its morphological diversity, however, generic delimitation within the desmoid clade is problematic and the intergeneric relationships of the constituent genera are only poorly understood. Bayesian, maximum likelihood and maximum parsimony analyses of plastid DNA sequence data (matK, psbA-trnH, ndhF, rbcL, trnL-F; ca. 5.4 kb; 52 taxa) were used to clarify phylogenetic relationships within the desmoid clade. The evolution and taxonomic utility of selected fruit and flower characters was investigated with likelihood and parsimony ancestral character reconstructions. The results indicate problems in the current delimitations of Dasymaschalon and Friesodielsia. Friesodielsia as currently circumscribed is polyphyletic, with African Friesodielsia species allied to the African genus Monanthotaxis, and only distantly related to Asian representatives. The majority of Dasymaschalon species form a strongly supported clade, but three species are more closely related to Asian species of Friesodielsia. Ancestral character reconstructions indicate that seed number and monocarp shape are of limited value in generic circumscriptions, and that the three-petalled corolla characteristic of Dasymaschalon evolved independently twice within the desmoid clade. Disruptions to homeotic gene expression or strong selective pressure for a partial enclosure of the mature stamens and carpels by the corolla are hypothesised to underlie the parallel evolution of pollination chambers formed by outer petal homologues subsequent to inner petal loss.
Persistent Identifierhttp://hdl.handle.net/10722/153207
ISSN
2013 Impact Factor: 3.051
2013 SCImago Journal Rankings: 0.860
ISI Accession Number ID
References

 

Author Affiliations
  1. Duke-NUS Graduate Medical School Singapore
  2. The University of Hong Kong
  3. Wageningen University and Research Centre
  4. National Herbarium of the Netherlands - NHN
DC FieldValueLanguage
dc.contributor.authorWang, Jen_HK
dc.contributor.authorThomas, DCen_HK
dc.contributor.authorSu, YCFen_HK
dc.contributor.authorMeinke, Sen_HK
dc.contributor.authorChatrou, LWen_HK
dc.contributor.authorSaunders, RMKen_HK
dc.date.accessioned2012-07-16T09:59:49Z-
dc.date.available2012-07-16T09:59:49Z-
dc.date.issued2012en_HK
dc.identifier.citationTaxon, 2012, v. 61 n. 3, p. 545-558en_HK
dc.identifier.issn0040-0262en_HK
dc.identifier.urihttp://hdl.handle.net/10722/153207-
dc.description.abstractDasymaschalon and the closely related genera Desmos, Friesodielsia and Monanthotaxis together comprise ca. 170 species of trees, shrubs and woody climbers distributed in tropical Africa and tropical Asia. These genera form the desmoid clade, which, because of the presence of diverse flower and fruit syndromes including different types of pollination chambers and moniliform monocarps, offers an opportunity to investigate potentially ecologically significant shifts in flower and fruit characters. Despite its morphological diversity, however, generic delimitation within the desmoid clade is problematic and the intergeneric relationships of the constituent genera are only poorly understood. Bayesian, maximum likelihood and maximum parsimony analyses of plastid DNA sequence data (matK, psbA-trnH, ndhF, rbcL, trnL-F; ca. 5.4 kb; 52 taxa) were used to clarify phylogenetic relationships within the desmoid clade. The evolution and taxonomic utility of selected fruit and flower characters was investigated with likelihood and parsimony ancestral character reconstructions. The results indicate problems in the current delimitations of Dasymaschalon and Friesodielsia. Friesodielsia as currently circumscribed is polyphyletic, with African Friesodielsia species allied to the African genus Monanthotaxis, and only distantly related to Asian representatives. The majority of Dasymaschalon species form a strongly supported clade, but three species are more closely related to Asian species of Friesodielsia. Ancestral character reconstructions indicate that seed number and monocarp shape are of limited value in generic circumscriptions, and that the three-petalled corolla characteristic of Dasymaschalon evolved independently twice within the desmoid clade. Disruptions to homeotic gene expression or strong selective pressure for a partial enclosure of the mature stamens and carpels by the corolla are hypothesised to underlie the parallel evolution of pollination chambers formed by outer petal homologues subsequent to inner petal loss.en_HK
dc.languageengen_US
dc.publisherInternational Association for Plant Taxonomy. The Journal's web site is located at http://www.iapt-taxon.org/en_HK
dc.relation.ispartofTaxonen_HK
dc.subjectAnnonaceaeen_HK
dc.subjectCharacter evolutionen_HK
dc.subjectDasymaschalonen_HK
dc.subjectFlower morphologyen_HK
dc.subjectFriesodielsiaen_HK
dc.subjectPhylogenyen_HK
dc.titleA plastid DNA phylogeny of Dasymaschalon (Annonaceae) and allied genera: Evidence for generic non-monophyly and the parallel evolutionary loss of inner petalsen_HK
dc.typeArticleen_HK
dc.identifier.emailSaunders, RMK: saunders@hkucc.hku.hken_HK
dc.identifier.authoritySaunders, RMK=rp00774en_HK
dc.description.naturelink_to_subscribed_fulltext-
dc.identifier.scopuseid_2-s2.0-84862316547en_HK
dc.identifier.hkuros200462en_US
dc.relation.referenceshttp://www.scopus.com/mlt/select.url?eid=2-s2.0-84862316547&selection=ref&src=s&origin=recordpageen_HK
dc.identifier.volume61en_HK
dc.identifier.issue3en_HK
dc.identifier.spage545en_HK
dc.identifier.epage558en_HK
dc.identifier.isiWOS:000305439100005-
dc.publisher.placeAustriaen_HK
dc.identifier.scopusauthoridWang, J=54892877300en_HK
dc.identifier.scopusauthoridThomas, DC=25628765500en_HK
dc.identifier.scopusauthoridYvonne, CF=55253635100en_HK
dc.identifier.scopusauthoridMeinke, S=37261818000en_HK
dc.identifier.scopusauthoridChatrou, LW=6603262508en_HK
dc.identifier.scopusauthoridSaunders, RMK=35345489600en_HK

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