Abstract
Abaxial and adaxial stomatal responses to light of different wavelengths and to phenylacetic acid (PAA), a molecule known to form complexes with irradiated flavins, were examined on isolated epidermes of Commelina communis L. Blue light was superior to red and green in promoting opening. Potassium accumulation and malate production were common to both abaxial and adaxial stomatal cells, but the photosensitivity was markedly higher in the former than in the latter. PAA suppressed opening and potassium accumulation in guard cells, but hardly affected the level of epidermal malate; C02-free air failed to reverse these suppressions. The PAA-effect was more substantial in blue light than in red, green or darkness; thus, a flavin photoreceptor is indicated. Because of the overall effect of PAA under all conditions it is suggested that, in addition to its interaction with blue light reception, PAA also has a more general effect on guard cells.
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