Stomatal Responses to Applied ABA and CO2in Epidermis Detached from Well-Watered and Water-Stressed Plants ofCommelina communisL.

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Abstract
Epidermal strips from either well-watered or water-stressed plants of Commelina communis L. were subjected to a range of ABA concentrations (10−6−10−3 mol m−3) in the presence (330 parts 10−6 in air) or virtual absence (3 parts 10–6 in air) of CO2. The stomatal response to CO2 was greater in epidermis from water-stressed plants, although there was a distinct CO2 response in epidermis from well-watered plants. Additions of ABA via the incubation medium had little effect on the relative CO2 response. Stomata responded to ABA both in the presence and virtual absence of CO2, but the relative response to ABA was greatest in the high CO2 treatment. When well-watered plants were sprayed with a 10−1 mol m−3 ABA solution 1 d prior to use, the stomatal response of detached epidermis to both CO2 and ABA was very similar to that of epidermis detached from water-stressed leaves. It is hypothesized that a prolonged exposure to ABA is necessary before there is any modification of the CO2 response of stomata.

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