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Carbon Isotope Ratio and the Extent of Daily CAM Use by Bromeliaceae

Pierce, Simon ; Winter, Klaus ; Griffiths, Howard

The New phytologist, 2002-10, Vol.156 (1), p.75-83 [Periódico revisado por pares]

Oxford, UK: Blackwell Science

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  • Título:
    Carbon Isotope Ratio and the Extent of Daily CAM Use by Bromeliaceae
  • Autor: Pierce, Simon ; Winter, Klaus ; Griffiths, Howard
  • Assuntos: Acidification ; Acidity ; Bromeliad ; C3 plants ; Carbon dioxide ; Carbon isotopes ; carbon pathway ; Crassulacean acid metabolism ; crassulacean acid metabolism (CAM) ; Drought ; Ecophysiology ; epiphyte ; Leaf blade ; photosynthesis ; Plants ; δ13C
  • É parte de: The New phytologist, 2002-10, Vol.156 (1), p.75-83
  • Descrição: • Use of carbon isotope ratio (δ13C) to resolve photosynthetic pathways ( C3, C4or CAM) has limitations imposed by the use of intermediate photosynthetic modes by certain plant taxa. • Diel gas-exchange patterns, leaf δ13C values and nocturnal tissue acidification were determined for 50 Bromeliaceae. • δ13C values for well watered plants reflected the proportion of daily CO2uptake occurring at night. Thirteen per cent of species with δ13C values typical of C3plants (i.e. from -22.6 to -31.5‰) showed nocturnal acidification and either a small proportion (< 10%) of daily CO2uptake occurring nocturnally or internal CO2recycling during part of the night. None altered CAM expression in response to short-term drought, but the contribution of CAM to daily carbon gain became proportionally more important as C3CO2uptake failed. • Surveys of plant communities using solely the carbon isotope technique under-estimate the number of CAM-equipped plants.
  • Editor: Oxford, UK: Blackwell Science
  • Idioma: Inglês
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