Brinckmann, E., Hartung, W. and Wartinger, M. 1990. Abscisic acid levels of individual leaf cells. -Physiol. Plant. 80: 51-54.Abscisic acid (ABA) concentrations of guard cells, subsidiary cells and epidermis cells of Commelina communis L. and Tradescantia virginiana L. were determined in cell sap samples extracted by means of micro glass capillaries. Concentrations up to 6.7 mAf were indicated by commercial immunoassay test kits. A gradient of ABA concentration was found between guard celis (2.49 ±1.81 mAf, n = 25), subsidiary cells (1.25 ± 1.46 mM, n = 21) and epidermis cells (0.86 ± 0.76 mM, n = 20; mean values ± SD).
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