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

Lookup NU author(s): Professor Christine Foyer

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Abstract

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. © 2008 Federation of European Biochemical Societies.

Publication metadata

Author(s): Bartoli CG, Tambussi EA, Diego F, Foyer CH

Publication type: Article

Publication status: Published

Journal: FEBS Letters

Year: 2009

Volume: 583

Issue: 1

Pages: 118-122

ISSN (print): 0014-5793

ISSN (electronic): 1873-3468

Publisher: Elsevier BV

URL: http://dx.doi.org/10.1016/j.febslet.2008.11.034

DOI: 10.1016/j.febslet.2008.11.034

PubMed id: 19059408

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