TITLE

Heterogeneous inhibition of photosynthesis over the leaf surface ofRosa rubiginosaL. during water stress and abscisic acid treatment: induction of a metabolic component by limitation of CO2 diffusion

AUTHOR(S)
Meyer, Sylvie; Genty, Bernard
PUB. DATE
November 1999
SOURCE
Planta;Nov99, Vol. 210 Issue 1, p126
SOURCE TYPE
Academic Journal
DOC. TYPE
Article
ABSTRACT
The contribution of changes in stomatal conductance and metabolism in determining heterogeneous photosynthesis inhibition during dehydration and abscisic acid (ABA) feeding was investigated using detached leaves ofRosa rubiginosaL. The steady-state and maximal rates of electron transport under a transient high CO2 concentration were monitored using chlorophyll fluorescence imaging. The decrease in electron transport rate induced by dehydration and ABA treatment almost reverted to the control rate under transient high CO2 availability. Therefore, inhibition of photosynthesis was mainly mediated through stomatal closure. However, since reversion was not complete, a metabolic inhibition was also identified as a decrease in the maximal electron transport rate driven by carboxylation. Under dehydration or ABA feeding, as under low ambient CO2 treatment, in 21% or 0.4% O2, the lower the steady-state electron transport was, the lower was the maximal electron transport rate during transient high CO2 availability. We conclude that low CO2 availability reduced the capacity of ribulose-1,5-bisphosphate carboxylase-oxygenase (Rubisco) to drive electron transport. The potential contribution of Rubisco deactivation mediated by stomatal closure is discussed.
ACCESSION #
16399310

 

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