Figure 5.
Endogenous ABA does not close stomata of A. filix-femina during drought. The response of stomatal conductance (gs) to instantaneous rehydration (marked by a vertical dashed line) through the stipe (wild-type form; solid circles) or intact plant through the roots (Frizelliae form; shaded circles) in drought-stressed individuals of A. filix-femina. Leaf water potential (Ψl) in each form before rehydration is noted in the bottom left of the panel. Horizontal dotted lines denote gs measured in the same leaves of both forms before drought stress. Foliar ABA levels (expressed in terms of dry weight) and Ψl, measured after gs stability after rehydration, are shown.