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Crassulacean acid metabolism in the epiphytic fern Patycerium bifurcatum

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Photosynthetica

Abstract

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.

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Abbreviations

ABA:

abscisic acid

Fv/Fm :

the maximum quantum efficiency of photosystem 2

g s :

stomatal conductance

NAD(P)-ME, NAD(P):

malic enzymes [EC 1.1.1.38(40)]

OAA:

oxaloacetic acid

P N :

net photosynthetic rate

PEP:

phosphoenolpyruvate

PEPC:

phosphoenolpyruvate carboxylase (EC 4.1.1.31)

PEPCK:

phosphoenolpyruvate carboxykinase (EC 4.1.1.32)

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Authors and Affiliations

  1. Department of Plant Physiology, Institute of Biology, Pedagogical Academy, 30-054 k]Kraków, Podbrzezie 3, Poland

    G. Rut, J. Krupa & A. Rzepka

  2. Institute of Plant Physiology, Polish Academy of Sciences, ul. Niezapominajek 21, 30-239, Kraków, Poland

    Z. Miszalski & I. Ślesak

Authors
  1. G. Rut
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  2. J. Krupa
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  3. Z. Miszalski
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  4. A. Rzepka
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  5. I. Ślesak
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Correspondence to I. Ślesak.

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Rut, G., Krupa, J., Miszalski, Z. et al. Crassulacean acid metabolism in the epiphytic fern Patycerium bifurcatum . Photosynthetica 46, 156–160 (2008). https://doi.org/10.1007/s11099-008-0026-8

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  • DOI: https://doi.org/10.1007/s11099-008-0026-8

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