Fig. 4From: A method to experimentally clamp leaf water content to defined values to assess its effects on apoplastic pHA Recording of apoplastic pH of the lower leaf epidermis by fluorescence ratio imaging using OregonGreen under feedback-controlled leaf water content (LWC). LWC set-point was varied by a programmed ramp from 100% full saturation under low VPD to 98.5% saturation within 40 min. and in reverse to achieve constant rates of change of LWC. B Relation between LWC and apopastic pH. Same data as panel A. Here the the dose response relation observed during slowly changing LWC is visualizedBack to article page