Artículos de revistas
Effect of mitochondrial ascorbic acid synthesis on photosynthesis
Fecha
2016-07Registro en:
Senn, María Eugenia; Gergoff Grozeff, Gustavo Esteban; Alegre, Matias Leonel; Barrile, Franco; de Tullio, M. C.; et al.; Effect of mitochondrial ascorbic acid synthesis on photosynthesis; Elsevier France-editions Scientifiques Medicales Elsevier; Plant Physiology and Biochemistry; 104; 7-2016; 29-35
0981-9428
CONICET Digital
CONICET
Autor
Senn, María Eugenia
Gergoff Grozeff, Gustavo Esteban
Alegre, Matias Leonel
Barrile, Franco
de Tullio, M. C.
Bartoli, Carlos Guillermo
Resumen
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 O2 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