Abstract
Observations made with primary leaves of Phaseolus vulgaris L. demonstrated that phytochrome modulates light-induced stomatal movement. Removal of the far-red-absorbing form of the pigment (Pfr) with far-red (FR) radiation decreased the time required by the stomata to reach maximal opening following a dark-to-light transition; this effect of FR was fully reversible with red. Removal of Pfr with FR also decreased the time required to reach maximal closure following a light-to-dark transition, and the rate of closure was dependent on the final irradiation treatment before darkness. No evidence was found for phytochrome involvement in determining stomatal aperture under constant conditions of either darkness of light.
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Abbreviations
- Chl:
-
chlorophyll
- D:
-
darkness
- FR:
-
far-red
- π:
-
phytochrome photostationary state
- Pfr, Pr:
-
FR- and R-absorbing forms of phytochrome, respectively
- R:
-
red
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Holmes, M.G., Klein, W.H. Evidence for phytochrome involvement in light-mediated stomatal movement in Phaseolus vulgaris L.. Planta 166, 348–353 (1985). https://doi.org/10.1007/BF00401172
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DOI: https://doi.org/10.1007/BF00401172