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Lateral diffusion of CO2 in leaves of the crassulacean acid metabolism plant Kalanchoë daigremontiana Hamet et Perrier

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Abstract

Dynamic patchiness of photosystem II (PSII) activity in leaves of the crassulacean acid metabolism (CAM) plant Kalanchoë daigremontiana Hamet et Perrier, which was independent of stomatal control and was observed during both the day/night cycle and circadian endogenous oscillations of CAM, was previously explained by lateral CO2 diffusion and CO2 signalling in the leaves [Rascher et al. (2001) Proc Natl Acad Sci USA 98:11801–11805; Rascher and Lüttge (2002) Plant Biol 4:671–681]. The aim here was to actually demonstrate the importance of lateral CO2 diffusion and its effects on localized PSII activity. Covering small sections of entire leaves with silicone grease was used for local exclusion of a contribution of atmospheric CO2 to internal CO2 via transport through stomata. A setup for combined measurement of gas exchange and chlorophyll fluorescence imaging was used for recording photosynthetic activity with a spatiotemporal resolution. When remobilization of malic acid from vacuolar storage and its decarboxylation in the CAM cycle caused increasing internal CO2 concentrations sustaining high PSII activity behind closed stomata, PSII activity was also increased in adjacent leaf sections where vacuolar malic acid accumulation was minimal as a result of preventing external CO2 supply due to leaf-surface greasing, and where therefore CO2 could only be supplied by diffusion from the neighbouring malic acid-remobilizing leaf tissue. This demonstrates lateral CO2 diffusion and its effect on local photosynthetic activity.

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Abbreviations

CAM :

Crassulacean acid metabolism

g H2O :

Leaf conductance for water vapour

J CO2 :

Net CO2 exchange

J H2O :

Net water vapour exchange

p aCO2 :

Atmospheric CO2 partial pressure in pascals

p iCO2 :

Internal CO2 concentration

Rubisco :

Ribulose-1,5-bisphosphate carboxylase/oxygenase

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Correspondence to Ulrich Lüttge.

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Duarte, H.M., Jakovljevic, I., Kaiser, F. et al. Lateral diffusion of CO2 in leaves of the crassulacean acid metabolism plant Kalanchoë daigremontiana Hamet et Perrier. Planta 220, 809–816 (2005). https://doi.org/10.1007/s00425-004-1398-z

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