The effects of cyto kinins and abscisic acid on stomatal behavior of maize zea mays cultivar john innes and commelina communis

Blackman, P.G.; Davies, W.J.

Journal of Experimental Botany 34(149): 1619-1626


ISSN/ISBN: 0022-0957
Accession: 006662321

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Epidermal strips and leaf fragments of Commelina and leaf fragments of maize were incubated in solutions containing naturally-occurring or synthetic cytokinins and/or ABA . The effects of these treatments on stomatal behavior were assessed. Cytokinins alone did not promote stomatal opening in either species but concentrations of both zeatin and kinetin from 10-3 to 10-1 mol m-3 caused some reversal of ABA-stimulated closure of maize stomata. The reversal of the ABA effect increased with increasing cytokinin concentration. Cytokinins had no effect on ABA-stimulated closure of Commelina stomata. When applied alone, at high concentration (10-1 mol m-3), to Commelina epidermis or leaf pieces both zeatin and kinetin restricted stomatal opening.