Journal
PLANT PHYSIOLOGY AND BIOCHEMISTRY
Volume 104, Issue -, Pages 29-35Publisher
ELSEVIER FRANCE-EDITIONS SCIENTIFIQUES MEDICALES ELSEVIER
DOI: 10.1016/j.plaphy.2016.03.012
Keywords
Ascorbic acid; Photosynthesis; Respiration; Stomata
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Funding
- ANPCyT, Argentina [PICT 2012-0809]
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Ascorbic acid (AA) is synthesized in plant mitochondria through the oxidation of L-galactono-1,4-lactone (L-GalL) and then distributed to different cell compartments. AA-deficient Arabidopsis thaliana mutants (vtc2) and exogenous applications of L-GalL were used to generate plants with different AA content in their leaves. This experimental approach allows determining specific AA-dependent effects on carbon metabolism. No differences in O-2 uptake, malic and citric acid and NADH content suggest that AA synthesis or accumulation did not affect mitochondrial activity; however, L-GalL treatment increased CO2 assimilation and photosynthetic electron transport rate in vtc2 (but not wt) leaves demonstrating a stimulation of photosynthesis after L-GalL treatment. Increased CO2 assimilation correlated with increased leaf stomatal conductance observed in L-GalL-treated vtc2 plants. (C) 2016 Elsevier Masson SAS. All rights reserved.
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