Folia Horticulturae

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The effect of growth regulators on stomatal aperture in senescing cut leaves of Zantedeschia aethiopica Spr. and Hosta Tratt. ‘Undulata Erromena’

Mariusz Wachowicz, Ewa Skutnik, Julita Rabiza-Świder

Department of Ornamental Plants
Warsaw Agricultural University
Nowoursynowska 166, 02-787 Warszawa, Poland
e-mail: wachowiczm@alpha.sggw.waw.pl

This paper reports the results of observations of the stomatal aperture in senescing cut leaves of Zantedeschia aethiopica Spr. and Hosta ‘Undulata Erromena’, two species used as the florists’ green. Their display life after harvest can be extended by the application of growth regulators, therefore the detached leaves of Zantedeschia and Hosta were dipped in aqueous solutions containing 1 mmol dm-3 (= 346 mg dm-3) GA3 or 1 mmol dm-3 (= 225 mg dm-3) BA, respectively, before being placed into vases with distilled water. Leaves not treated with growth regulators and placed directly into water or a preservative containing 8-hydroxyquinoline citrate (8-HQC 200 mg dm-3) and sucrose (S 20 g dm-3) served as controls. The degree of stomata opening was determined by a modified replica method of Poskuta and Karpowiczowa (1971). During leaf senescence of both species stomatal closure was observed in all treatments. The preservative shortened the leaf vase life and hastened the closing of stomata which were less open by 12% (Zantedeschia) and 18% (Hosta) relative to water controls. Hormones - GA3 in Zantedeschia and BA in Hosta - delayed leaf senescence and enhanced stomata opening by 21% and 44%, respectively.

Wachowicz M., Skutnik E., Rabiza-Świder J., 2006. The effect of growth regulators on stomatal aperture in senescing cut leaves of Zantedeschia aethiopica Spr. and Hosta Tratt. ‘Undulata Erromena’. Folia Horticulturae 18/2: 65-75.