Control of Ascorbate Synthesis by Respiration and Its Implications for Stress Responses

We show for the first time that respiration can control ascorbate (AA) synthesis in plants. Evidence for this control is provided by (a) the localization of L-galactono-1,4-lactone dehydrogenase (GalLDH), the terminal enzyme in AA biosynthesis, with mitochondrial complex I, and its regulation by ele...

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Detalles Bibliográficos
Autores principales: Millar, A. Harvey, Mittova, Valentina, Kiddle, Guy, Heazlewood, Joshua L., Bartoli, Carlos Guillermo, Theodoulou, Frederica L., Foyer, Christine H.
Formato: Articulo
Lenguaje:Inglés
Publicado: 2003
Materias:
Ciencias Agrarias
ascorbate
respiration
Acceso en línea:http://sedici.unlp.edu.ar/handle/10915/84501
Aporte de:
SEDICI (UNLP) de Universidad Nacional de La Plata
Descripción
Sumario:We show for the first time that respiration can control ascorbate (AA) synthesis in plants. Evidence for this control is provided by (a) the localization of L-galactono-1,4-lactone dehydrogenase (GalLDH), the terminal enzyme in AA biosynthesis, with mitochondrial complex I, and its regulation by electron transport through this complex, (b) the absolute requirement of the enzyme for oxidized cytochrome c (cyt c<SUB>(ox)</SUB>) as substrate, and (c) the coordinated response of respiration and AA synthesis to stress induced by hormone treatment.

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