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

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


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.

Publication types

  • Research Support, Non-U.S. Gov't

MeSH terms

  • Ascorbic Acid / biosynthesis*
  • Glutathione / metabolism*
  • Light*
  • Phaseolus / metabolism*
  • Phaseolus / radiation effects
  • Photosynthesis*
  • Plant Leaves / metabolism*
  • Plant Leaves / radiation effects


  • Glutathione
  • Ascorbic Acid