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Stomata in epidermal strips from growth chamber-grown Vicia faba leaves opened less in response to white light than did stomata from greenhouse-grown leaves. Chlorophyll-mediated, red light-stimulated opening was similar in stomata from the two growth conditions, but stomata from the growth chamber environment had a severely reduced response to blue light. Transfer of plants between the two growth conditions resulted in an acclimation of the stomatal blue light response. Stomata lost blue light sensitivity within 1 d of transfer to growth chamber conditions and gained sensitivity to blue light over an 8 d period after transfer to a greenhouse. Short-term transfer experiments confirmed that the rapid loss of blue light sensitivity was an acclimation response, requiring between 12 and 20 h exposure to growth chamber conditions. The acclimation of the stomatal response to blue light was inversely related to a previously reported acclimation response in which stomata change between high CO2 sensitivity under growth chamber conditions and low CO2 sensitivity under greenhouse conditions. The time courses of the blue light and CO2 acclimation responses were virtually identical, suggesting the possibility of a common acclimation mechanism.

The Blue Light-Specific Response of Vicia faba Stomata Acclimates to Growth Environment