Journal
PLANT CELL AND ENVIRONMENT
Volume 32, Issue 11, Pages 1479-1486Publisher
WILEY
DOI: 10.1111/j.1365-3040.2009.02022.x
Keywords
epidermes; guard cells; leaves; signalling; stomata
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The mechanisms by which stomata respond to red light and CO2 are unknown, but much of the current literature assumes that these mechanisms reside wholly within the guard cells. However, responses of guard cells in isolated epidermes are typically much smaller than those in leaves, and there are several lines of evidence in the literature suggesting that the mesophyll is necessary for these responses in leaves. This paper advances the opinion that although guard cells may have small direct responses to red light and CO2, most of the stomatal response to these factors in leaves is caused by an unknown signal that originates in the mesophyll.
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