Photosynthetica, 2008 (vol. 46), issue 1

Photosynthetica 2008, 46(1):156 | DOI: 10.1007/s11099-008-0026-8

Crassulacean acid metabolism in the epiphytic fern Patycerium bifurcatum

G. Rut1, J. Krupa1, Z. Miszalski2, A. Rzepka1, I. Ślesak2,*
1 Department of Plant Physiology, Institute of Biology, Pedagogical Academy, Poland
2 Institute of Plant Physiology, Polish Academy of Sciences, Kraków, Poland

The epiphytic fern Platycerium bifurcatum grows in different habitats characterized by drought and high irradiance stress. The plant shows diurnal malate oscillations, indicative for CAM expression only in cover leaves, but not in sporotrophophyll. In P. bifurcatum cover leaves exposed to high irradiance and desiccation, the decrease in both CO2 assimilation (P N) and stomatal conductance (g s) was accompanied with occurrence of diurnal malate oscillations. Exogenously applied abscisic acid (ABA) induced the decrease in P N and g s, but no clear change in malate oscillations. The measurements of the maximum quantum efficiency of photosystem 2 (Fv/Fm) under high irradiance showed distinct photoinhibition, but no clear changes in Fv/Fm due to desiccation and ABA-treatment were found.

Keywords: abscisic acid; chlorophyll fluorescence; drought stress; malate; net photosynthetic rate; photosystem 2; stomatal conductance

Received: May 25, 2007; Accepted: September 3, 2007; Published: March 1, 2008Show citation

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Rut, G., Krupa, J., Miszalski, Z., Rzepka, A., & Ślesak, I. (2008). Crassulacean acid metabolism in the epiphytic fern Patycerium bifurcatum. Photosynthetica, 46(1), 156. doi: 10.1007/s11099-008-0026-8.
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