Green light reversal of blue-light-stimulated stomatal opening is found in a diversity of plant species |
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Authors: | Talbott Lawrence D Nikolova Ganka Ortiz Arisa Shmayevich Irene Zeiger Eduardo |
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Institution: | Department of Organismic Biology, Ecology and Evolution, University of California, Los Angeles, 900 Veteran Ave., Los Angeles, California 90024 USA. |
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Abstract: | Reversal by green light of blue-light-stimulated stomatal opening was found across a number of plant species, including leguminous and nonleguminous dicots and grass and nongrass monocots. Simultaneous exposure to equal fluence rates of blue and green light resulted in ~50% reversal of normal blue light opening. Complete reversal occurred when the fluence rate of green light was approximately twice that of blue light. These results suggest that blue-green reversibility of stomatal opening is a basic photobiological property of guard cells. The blue-green reversibility of stomatal opening has been hypothesized to ensue from the cycling of two interconvertible, isomeric forms of the blue-light photoreceptor, zeaxanthin. Testing of blue-green reversibility could provide a valuable diagnostic tool for zeaxanthin-mediated blue-light photoperception. |
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