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CO2‐concentrating: consequences in crassulacean acid metabolism
Luttge, U.
Journal of experimental botany, 2002-11, Vol.53 (378), p.2131-2142
[Periódico revisado por pares]
Oxford: Oxford University Press
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Título:
CO2‐concentrating: consequences in crassulacean acid metabolism
Autor:
Luttge, U.
Assuntos:
Animal and plant ecology
;
Animal, plant and microbial ecology
;
Autoecology
;
Biological and medical sciences
;
circadian clock
;
Crassulacean acid metabolism
;
Ecophysiology
;
Fundamental and applied biological sciences. Psychology
;
Key words: Carbon dioxide concentrating
;
Leaves
;
Metabolism
;
Oxidative stress
;
oxygen concentrating
;
Photosynthesis
;
Photosynthesis, respiration. Anabolism, catabolism
;
Physiological regulation
;
Plant physiology
;
Plant physiology and development
;
Plants
;
Plants and fungi
;
Review article
;
Stomata
;
Winter
É parte de:
Journal of experimental botany, 2002-11, Vol.53 (378), p.2131-2142
Notas:
istex:5DB9ADBD2D3FB4DEAD0267AB0B0CDCA977230F7A
local:erf081
Received 11 April 2002; Accepted 1 July 2002
1 Fax +49 61 5116 4630. E‐mail: luettge@bio.tu‐darmstadt.de
ark:/67375/HXZ-G2GQRQCL-4
Descrição:
The consequences of CO2‐concentrating in leaf air‐spaces of CAM plants during daytime organic acid decarboxylation in Phase III of CAM (crassulacean acid metabolism) are explored. There are mechanistic consequences of internal CO2 partial pressures, piCO2. These are (i) effects on stomata, i.e. high piCO2 eliciting stomatal closure in Phase III, (ii) regulation of malic acid remobilization from the vacuole, malate decarboxylation and refixation of CO2 via Rubisco (ribulose bisphosphate carboxylase/oxygenase), and (iii) internal signalling functions during the transitions between Phases II and III and III and IV, respectively, in the natural day/night cycle and in synchronizing the circadian clocks of individual leaf cells or leaf patches in the free‐running endogenous rhythmicity of CAM. There are ecophysiological consequences. Obvious beneficial ecophysiological consequences are (i) CO2‐acquisition, (ii) increased water‐use‐ efficiency, (iii) suppressed photorespiration, and (iv) reduced oxidative stress by over‐energization of the photosynthetic apparatus. However, the general potency of these beneficial effects may be questioned. There are also adverse ecophysiological consequences. These are (i) energetics, (ii) pH effects and (iii) Phase III oxidative stress. A major consequence of CO2‐concentrating in Phase III is O2‐concentrating, increased piCO2 is accompanied by increased piO2. Do reversible shifts of C3/CAM‐intermediate plants between the C3–CAM–C3 modes of photosynthesis indicate that C3‐photosynthesis provides better protection from irradiance stress? There are many open questions and CAM remains a curiosity.
Editor:
Oxford: Oxford University Press
Idioma:
Inglês
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