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Article: Functional monoecy due to delayed anther dehiscence: a novel mechanism in Pseuduvaria mulgraveana (Annonaceae)

TitleFunctional monoecy due to delayed anther dehiscence: a novel mechanism in Pseuduvaria mulgraveana (Annonaceae)
Authors
Issue Date2013
Citation
PLoS One, 2013, v. 8, p. e59951 How to Cite?
AbstractUnlike most genera in the early-divergent angiosperm family Annonaceae, Pseuduvaria exhibits a diversity of floral sex expression. Most species are structurally andromonoecious (or possibly androdioecious), although the hermaphroditic flowers have been inferred to be functionally pistillate, with sterile staminodes. Pseuduvaria presents an ideal model for investigating the evolution of floral sex in early-divergent angiosperms, although detailed empirical studies are currently lacking. The phenology and pollination ecology of the Australian endemic species Pseuduvaria mulgraveana are studied in detail, including evaluations of floral scent chemistry, pollen viability, and floral visitors. Results showed that the flowers are pollinated by small diurnal nitidulid beetles and are protogynous. Pollen from both hermaphroditic and staminate flowers are shown to be equally viable. The structurally hermaphroditic flowers are nevertheless functionally pistillate as anther dehiscence is delayed until after petal abscission and hence after the departure of pollinators. This mechanism to achieve functional unisexuality of flowers has not previously been reported in angiosperms. It is known that protogyny is widespread amongst early-divergent angiosperms, including the Annonaceae, and is effective in preventing autogamy. Delayed anther dehiscence represents a further elaboration of this, and is effective in preventing geitonogamy since very few sexually mature flowers occur simultaneously in an individual. We highlight the necessity for field-based empirical interpretations of functional floral sex expression prior to evaluations of evolutionary processes.
Persistent Identifierhttp://hdl.handle.net/10722/185144
PubMed Central ID

 

DC FieldValueLanguage
dc.contributor.authorPang, CCen_US
dc.contributor.authorScharaschkin, Ten_US
dc.contributor.authorSu, YCFen_US
dc.contributor.authorSaunders, RMKen_US
dc.date.accessioned2013-07-15T10:34:16Z-
dc.date.available2013-07-15T10:34:16Z-
dc.date.issued2013en_US
dc.identifier.citationPLoS One, 2013, v. 8, p. e59951en_US
dc.identifier.urihttp://hdl.handle.net/10722/185144-
dc.description.abstractUnlike most genera in the early-divergent angiosperm family Annonaceae, Pseuduvaria exhibits a diversity of floral sex expression. Most species are structurally andromonoecious (or possibly androdioecious), although the hermaphroditic flowers have been inferred to be functionally pistillate, with sterile staminodes. Pseuduvaria presents an ideal model for investigating the evolution of floral sex in early-divergent angiosperms, although detailed empirical studies are currently lacking. The phenology and pollination ecology of the Australian endemic species Pseuduvaria mulgraveana are studied in detail, including evaluations of floral scent chemistry, pollen viability, and floral visitors. Results showed that the flowers are pollinated by small diurnal nitidulid beetles and are protogynous. Pollen from both hermaphroditic and staminate flowers are shown to be equally viable. The structurally hermaphroditic flowers are nevertheless functionally pistillate as anther dehiscence is delayed until after petal abscission and hence after the departure of pollinators. This mechanism to achieve functional unisexuality of flowers has not previously been reported in angiosperms. It is known that protogyny is widespread amongst early-divergent angiosperms, including the Annonaceae, and is effective in preventing autogamy. Delayed anther dehiscence represents a further elaboration of this, and is effective in preventing geitonogamy since very few sexually mature flowers occur simultaneously in an individual. We highlight the necessity for field-based empirical interpretations of functional floral sex expression prior to evaluations of evolutionary processes.-
dc.languageengen_US
dc.relation.ispartofPLoS Oneen_US
dc.rightsCreative Commons: Attribution 3.0 Hong Kong License-
dc.titleFunctional monoecy due to delayed anther dehiscence: a novel mechanism in Pseuduvaria mulgraveana (Annonaceae)en_US
dc.typeArticleen_US
dc.identifier.emailPang, CC: chiupang@hku.hken_US
dc.identifier.emailSaunders, RMK: saunders@hkucc.hku.hken_US
dc.identifier.authoritySaunders, RMK=rp00774en_US
dc.description.naturepublished_or_final_version-
dc.identifier.doi10.1371/journal.pone.0059951-
dc.identifier.pmcidPMC3608580-
dc.identifier.hkuros215275en_US
dc.identifier.volume8en_US
dc.identifier.spagee59951en_US
dc.identifier.epagee59951en_US

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