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Journal of Experimental Botany, Vol 49, 611-616, Copyright © 1998 by Oxford University Press

ARTICLES

Short communication. Abscisic acid is not necessarily required for the induction of patchy stomatal closure

J Eckstein, O Artsaenko, U Conrad, M Peisker and W Beyschlag
Julius-von-Sachs-Institut fur Biowissenschaften, Lehrstuhl fur Botanik II, Mittlerer Dallenbergweg 64, D-97082 Wurzburg, Germany; Institut fur Pflanzengenetik und Kulturpflanzenforschung, Corrensstrasse 3, D-06466 Gatersleben, Germany; Lehrstuhl fur Experimentelle Okologie und Okosystembiologie, Universitatsstrasse 25, D-33615 Bielefeld, Germany; Corresponding author and correspondence address; Fax: +49 521 106 6038

Patchy stomatal closure was observed in leaves of transgenic plants of Nicotiana plumbaginifolia producing antibodies that block the action of abscisic acid. Stomatal patchiness was induced by leaf detachment and subsequent water loss. Stomatal closure was followed by an irreversible reduction of maximal chlorophyll fluorescence. The degree of deviation from the A/ci-curve is correlated with steady-state diffusion conductance before leaf detachment. It is concluded that a heterogeneous sensitivity of stomata to abscisic acid is not directly involved in the induction of patchy stomatal closure.Keywords: Abscisic acid, chlorophyll fluorescence imaging, patchy stomatal closure, Nicotiana plumbaginifolia.
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