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Photosynthetica

, 46:156 | Cite as

Crassulacean acid metabolism in the epiphytic fern Patycerium bifurcatum

  • G. Rut
  • J. Krupa
  • Z. Miszalski
  • A. Rzepka
  • I. Ślesak
Brief Communication

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.

Additional key words

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

Abbreviations

ABA

abscisic acid

Fv/Fm

the maximum quantum efficiency of photosystem 2

gs

stomatal conductance

NAD(P)-ME, NAD(P)

malic enzymes [EC 1.1.1.38(40)]

OAA

oxaloacetic acid

PN

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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Copyright information

© Institute of Experimental Botany, ASCR 2008

Authors and Affiliations

  • G. Rut
    • 1
  • J. Krupa
    • 1
  • Z. Miszalski
    • 2
  • A. Rzepka
    • 1
  • I. Ślesak
    • 2
  1. 1.Department of Plant Physiology, Institute of BiologyPedagogical AcademyPoland
  2. 2.Institute of Plant PhysiologyPolish Academy of SciencesKrakówPoland

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