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The occurrence of crassulacean acid metabolism in Cymbidium (Orchidaceae) and its ecological and evolutionary implications

Motomura, H.(National Museum of Nature and Science, Tsukuba, Ibaraki (Japan). Tsukuba Botanical Garden) ; Yukawa, T ; Ueno, O ; Kagawa, A

Journal of plant research, 2008-03, Vol.121 (2), p.163-177 [Periódico revisado por pares]

Japan: Springer Japan

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Título:
The occurrence of crassulacean acid metabolism in Cymbidium (Orchidaceae) and its ecological and evolutionary implications
Autor: Motomura, H.(National Museum of Nature and Science, Tsukuba, Ibaraki (Japan). Tsukuba Botanical Garden) ; Yukawa, T ; Ueno, O ; Kagawa, A
Assuntos: Acids ; Biological Evolution ; Biomedical and Life Sciences ; CAM PATHWAY ; Carbon Isotopes - metabolism ; CICLO CAM ; Circadian Rhythm ; CYMBIDIUM ; Ecosystem ; EPIFITAS ; EPIPHYTE ; EPIPHYTES ; EVOLUCION ; EVOLUTION ; FILOGENIA ; FOTOSISTEMAS ; Life Sciences ; Malate Dehydrogenase - metabolism ; Malates - metabolism ; Metabolism ; ORCHIDACEAE ; Orchidaceae - anatomy & histology ; Orchidaceae - classification ; Orchidaceae - enzymology ; Phosphoenolpyruvate Carboxykinase (ATP) - metabolism ; Photosynthesis ; PHOTOSYSTEME ; PHOTOSYSTEMS ; PHYLOGENIE ; PHYLOGENY ; Plant Biochemistry ; Plant biology ; Plant Ecology ; Plant Leaves - anatomy & histology ; Plant Physiology ; Plant Sciences ; Regular Paper ; Studies ; VOIE DU METABOLISME CAM
É parte de: Journal of plant research, 2008-03, Vol.121 (2), p.163-177
Notas: 2009000940
F60
F40
ObjectType-Article-1
SourceType-Scholarly Journals-1
ObjectType-Feature-2
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Descrição: Crassulacean acid metabolism (CAM) is one of the photosynthetic pathways regarded as adaptations to water stress in land plants. Little is known about correlations among the level of CAM activity, environment of habitat, life form, and phylogenetic relationship of a plant group from an evolutionary perspective. We examined these relationships in 18 species of Cymbidium (Orchidaceae) because the genus shows distinctive diversification of habitats and life forms. The photosynthetic type was classed into three categories, strong CAM, weak CAM, and C3 on the basis of CAM activity. CAM expression in Cymbidium was confined to the epiphytic and lithophytic species. Especially, all of these species from tropical to subtropical rainforest exhibited CAM activity. On the other hand, the terrestrial species always exhibited C3 metabolism irrespective of their varied habitats. Regarding the evolution of photosynthetic characters, weak CAM was the ancestral state in Cymbidium and strong CAM and C3 metabolism occurred subsequently. The evolution of strong CAM likely enabled Cymbidium to extend to exposed sites in tropical lowland where marked water stress exists. Further, different levels of CAM activity characterized each species and such potential plasticity of CAM may realize the radiation of Cymbidium into sites with different environmental conditions.
Editor: Japan: Springer Japan
Idioma: Inglês

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The occurrence of crassulacean acid metabolism in Cymbidium (Orchidaceae) and its ecological and evolutionary implications

Motomura, H.(National Museum of Nature and Science, Tsukuba, Ibaraki (Japan). Tsukuba Botanical Garden) ; Yukawa, T ; Ueno, O ; Kagawa, A

Japan: Springer Japan

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