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FEBS Lett. 2009 Jan 5;583(1):118-22. doi: 10.1016/j.febslet.2008.11.034. Epub 2008 Dec 6.

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

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  • 1Instituto de FisiologĂ­a Vegetal, Facultad Ciencias Agrarias y Forestales, Universidad Nacional de La Plata, CCT-CONICET, La Plata, Argentina. carlos.bartoli@agro.unlp.edu.ar

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.

PMID:
19059408
[PubMed - indexed for MEDLINE]
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