Photosynthetic Acclimation to Light Regime and Water Stress by the C 3 - CAM Epiphyte Guzmania monostachia: Gas-Exchange Characteristics, Photochemical Efficiency and the Xanthophyll Cycle

The epiphyte Guzmania monostachia induced CAM activity when transferred to high light intensity (PFD) for 2 weeks under well-watered and water-stressed conditions. Nocturnal acidity resulted from the refixation of respiratory CO 2 ; daytime CO 2 uptake was sensitive to plant water status and was reduced by water stress under high PFD. In contrast, O 2 evolution characteristics were initially reduced by high PFI), with lower apparent quantum yield (AQY), photosynthetic capacity and increased light compensation point. Following the 14 day acclimation period, photosynthetic O 2 evolution recovered, although variable fluorescence (Fv/Fm) exhibited a sustained depression related to photoinhibitory quenching (...)

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