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Article << Previous     |     Next >>   Contents Vol 32(5)

Distinctive diel growth cycles in leaves and cladodes of CAM plants: differences from C3 plants and putative interactions with substrate availability, turgor and cytoplasmic pH

Liezel M. Gouws A B C, C. Barry Osmond A D, Ulrich Schurr B, Achim Walter A B E

A Biosphere 2 Laboratory, Columbia University, Oracle, AZ 85623, USA.
B Institute for Chemistry and Dynamics of the Geosphere: Phytosphere (ICG-III), Research Centre Jülich, 52425 Jülich, Germany.
C Institute of Plant Biotechnology, Stellenbosch University, Bloemfontein, South Africa.
D School of Biochemistry and Molecular Biology, Australian National University, Canberra, ACT 0200, Australia.
E Corresponding author. Email: a.walter@fz-juelich.de
F This paper originates from a presentation at the IVth International Congress on Crassulacean Acid Metabolism, Tahoe City, California, USA, July–August 2004
 
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Abstract

Distinct diel rhythms of leaf and cladode expansion growth were obtained in crassulacean acid metabolism (CAM) plants under water-limited conditions, with maxima at mid-day during phase III of CO2 assimilation. This pattern coincided with the availability of CO2 for photosynthesis and growth during the decarboxylation of malic acid, with maximum cell turgor due to the nocturnally accumulated malic acid, and with the period of low cytoplasmic pH associated with malic acid movement from vacuole to cytosol. Maximum growth rates were generally only 20% of those in C3 plants and were reached at a different time of the day compared with C3 plants. The results suggest that malic acid, as a source of carbohydrates, and a determinant of turgor and cytoplasmic pH, plays a major role in the control of diel growth dynamics in CAM plants under desert conditions. The observed plasticity in phasing of growth rhythms under situations of differing water availability suggests that a complex network of factors controls the diel growth patterns in CAM plants and needs to be investigated further.

Keywords: image processing, Opuntia, spatio-temporal dynamics.


   
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