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Sensitivity to far-red radiation in stomata of Phaseolus vulgaris L.: Rhythmic effects on conductance and photosynthesis

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Abstract

The influence of far-red (FR; 700–800 nm) radiation on steady-state stomatal conductance and net photosynthesis in P. vulgaris has been studied. Whereas FR radiation alone was relatively ineffective, addition of FR to a background of white light (WL; predominantly 400–700 nm) resulted in increased stomatal conductance. Stomata exhibited a marked diurnal sensitivity to FR. The action maximum for enhancing stomatal conductance was near 714 nm. A combination of FR and infra-red (IR; >800 nm) enhanced net photosynthesis when added to a background of WL. When IR alone was added to WL, there was a net decrease in photosynthesis, indicating that it is the FR waveband which is responsible for the observed photosynthetic effects. Naturally occurring levels of FR radiation (235 μmol·m-2·s-1) in vegetation-canopy shade enhanced net photosynthetic CO2 gain by 28% when added to a background of 55 μmol·m-2·s-1 WL.

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Abbreviations

BL:

blue

FR:

far-red

IR:

infra-red

PAR:

photosynthetically active radiation

R:

red

WL:

white light

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Authors and Affiliations

  1. Smithsonian Environmental Research Center, 12441 Parklawn Drive, 20852, Rockville, MD, USA

    M. G. Holmes, J. C. Sager & W. H. Klein

Authors
  1. M. G. Holmes
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  2. J. C. Sager
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  3. W. H. Klein
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Holmes, M.G., Sager, J.C. & Klein, W.H. Sensitivity to far-red radiation in stomata of Phaseolus vulgaris L.: Rhythmic effects on conductance and photosynthesis. Planta 168, 516–522 (1986). https://doi.org/10.1007/BF00392271

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  • DOI: https://doi.org/10.1007/BF00392271

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