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Investigating the pollination syndrome of the Hawaiian lobeliad genus Clermontia (Campanulaceae) using floral nectar traits.
Pender, Richard J; Morden, Clifford W; Paull, Robert E.
Afiliação
  • Pender RJ; Department of Botany, University of Hawai'i at Manoa, 3190 Maile Way, Honolulu, Hawai'i 96822 USA.
Am J Bot ; 101(1): 201-5, 2014 Jan.
Article em En | MEDLINE | ID: mdl-24414431
PREMISE OF THE STUDY: Floral nectar sugar compositions have, for several decades, been used to predict a plant species' pollinator guild. Plants possessing a generalist ornithophilous pollination syndrome produce nectar that is dilute (8-12% w/v sugars) with a low sucrose to hexose (glucose and fructose) ratio. The Hawaiian lobeliad genus Clermontia contains 22 endemic species of shrubs and small trees that are believed to have evolved flowers adapted for pollination by now mostly extinct or endangered endemic passerines in the Drepanidinae and Mohoidae. METHODS: We analyzed the nectar sugar compositions, concentration, and nectar standing crop of 23 taxa to test the assumption that Clermontia taxa have evolved floral traits in response to selection pressures from these avian pollinators. KEY RESULTS: All Clermontia taxa produced nectar with sugar concentrations (mean: 9.2% w/v ± 1.8 SD) comparable to the nectar of other plant species with a generalized bird pollination system. Nectar sugars were overwhelmingly composed of hexoses in all taxa (mean sucrose/hexose ratio: 0.02 ± 0.02). Nectar standing crop volumes varied widely among taxa, ranging from 9.7 µL ± 7.1 to 430.5 µL ± 401.8 (mean volume: 177.8 ± 112.0). CONCLUSIONS: Collectively, the nectar traits indicate that Clermontia species possess a generalist passerine pollination syndrome.
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Texto completo: 1 Coleções: 01-internacional Base de dados: MEDLINE Assunto principal: Fenótipo / Campanulaceae / Flores / Polinização / Néctar de Plantas País/Região como assunto: America do norte Idioma: En Ano de publicação: 2014 Tipo de documento: Article

Texto completo: 1 Coleções: 01-internacional Base de dados: MEDLINE Assunto principal: Fenótipo / Campanulaceae / Flores / Polinização / Néctar de Plantas País/Região como assunto: America do norte Idioma: En Ano de publicação: 2014 Tipo de documento: Article