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Environmental regulation of carbon isotope composition and crassulacean acid metabolism in three plant communities along a water availability gradient.(PHYSIOLOGICAL ECOLOGY--ORIGINAL PAPER)

Ricalde, M. Fernanda ; Andrade, Jose Luis ; Duran, Rafael ; Dupuy, Juan Manuel ; Sima, J. Luis ; Us - Santamaria, Roberth ; Santiago, Louis S.

Oecologia, Dec, 2010, Vol.164(4), p.871(10) [Periódico revisado por pares]

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  • Título:
    Environmental regulation of carbon isotope composition and crassulacean acid metabolism in three plant communities along a water availability gradient.(PHYSIOLOGICAL ECOLOGY--ORIGINAL PAPER)
  • Autor: Ricalde, M. Fernanda ; Andrade, Jose Luis ; Duran, Rafael ; Dupuy, Juan Manuel ; Sima, J. Luis ; Us - Santamaria, Roberth ; Santiago, Louis S.
  • Assuntos: Photosynthesis -- Physiological Aspects ; Plant Biochemistry -- Physiological Aspects ; Environmental Law -- Physiological Aspects ; Plants (Organisms) -- Physiological Aspects ; Water -- Physiological Aspects ; Rain -- Physiological Aspects
  • É parte de: Oecologia, Dec, 2010, Vol.164(4), p.871(10)
  • Descrição: Expression of crassulacean acid metabolism (CAM) is characterized by extreme variability within and between taxa and its sensitivity to environmental variation. In this study, we determined seasonal fluctuations in CAM photosynthesis with measurements of nocturnal tissue acidification and carbon isotopic composition ([delta][sup.13]C) of bulk tissue and extracted sugars in three plant communities along a precipitation gradient (500, 700, and 1,000 mm [year.sup.-1]) on the Yucatan Peninsula. We also related the degree of CAM to light habitat and relative abundance of species in the three sites. For all species, the greatest tissue acid accumulation occurred during the rainy season. In the 500 mm site, tissue acidification was greater for the species growing at 30% of daily total photon flux density (PFD) than species growing at 80% PFD. Whereas in the two wetter sites, the species growing at 80% total PFD had greater tissue acidification. All species had values of bulk tissue [delta][sup.13]C less negative than -20[per thousand], indicating strong CAM activity. The bulk tissue [delta][sup.13]C values in plants from the 500 mm site were 2[per thousand] less negative than in plants from the wetter sites, and the only species growing in the three communities, Acanthocereus tetragonus (Cactaceae), showed a significant negative relationship between both bulk tissue and sugar [delta][sup.13]C values and annual rainfall, consistent with greater C[O.sub.2] assimilation through the CAM pathway with decreasing water availability. Overall, variation in the use of CAM photosynthesis was related to water and light availability an[delta][sup.13]CAM appeared to be more ecologically important in the tropical dry forests than in the coastal dune. Keywords CAM * Carbon stable isotopes * Rainfall gradient * Tissue acidity * Yucatan
  • Idioma: English

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