Control of ascorbic acid synthesis and accumulation and glutathione by the incident light red/far red ratio in Phaseolus vulgaris leaves

The effects of red/far red (R/FR) ratios on leaf ascorbate (AA) and glutathione (GSH) accumulation were examined in common bean (Phaseolus vulgaris L.). Growth under low R/FR ratios resulted in a "shade" phenotype and much lower leaf AA and GSH contents than high (R/FR) ratios. Photosynthe...

Descripción completa

Guardado en:
Detalles Bibliográficos
Autores principales: Bartoli, Carlos Guillermo, Tambussi, Eduardo Alberto, Fanello, Diego Darío, Foyer, Christine H.
Formato: Articulo
Lenguaje:Inglés
Publicado: 2009
Materias:
Ciencias Agrarias
Ascorbic acid synthesis
Glutathione
l-galactone-1,4-lactone dehydrogenase
Light acclimation
Phytochrome
Pyridine nucleotide
Respiration
Acceso en línea:http://sedici.unlp.edu.ar/handle/10915/82751
Aporte de:
SEDICI (UNLP) de Universidad Nacional de La Plata
Descripción
Sumario:The effects of red/far red (R/FR) ratios on leaf ascorbate (AA) and glutathione (GSH) accumulation were examined in common bean (Phaseolus vulgaris L.). Growth under low R/FR ratios resulted in a "shade" phenotype and much lower leaf AA and GSH contents than high (R/FR) ratios. Photosynthesis rates were unaffected by changes in the R/FR ratio but leaf respiration rates, pyridine nucleotide pools and antioxidant enzyme activities were decreased under the low R/FR regime. The GSH pool changed slowly in response to altered R/FR ratios but leaf ascorbate acclimated over a single photoperiod. We conclude that light quality signals, particularly R/FR ratios, are important regulators of antioxidant synthesis and accumulation. These acclimatory changes are an early response to changing light environment.

Ejemplares similares