Abstract
Response of epidermal diffusive conductance to simultaneous changes in leaf water potential and photon flux density was studied in primary bean leaves. Values of epidermal conductance corresponding to every photon flux density decreased with decreasing leaf water potential below - 6.9 x 105Pa; slight deorease was followed by a rapid one at water potential ranging from - 8.0 to -10.5 x 105 Pa. In the leaves with water potential lower than -10.5 x 105 Pa neither the saturated photon flux density (1200 [xeinstein m-2s-1) induced photoactive stomatal opening.
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