ECO-PHYSIOLOGICAL STUDIES ON STOMATAL REGULATION IN SOME SPECIES OF AMARANTHACEAE AND COMPOSITAE
A. K. M. NAZRUL-ISLAM *
Department of Botany, Dhaka University, Dhaka, Bangladesh
*Author to whom correspondence should be addressed.
Abstract
Stomatal responses were studied in isolated epidermis of Amaranthus spinosus L., A. viridis L., Alternanthera sessilis R.Br. (Amaranthaceae); Synedrella modiflora Gaertn., and Eclipta prostrata L. (Compositae) incubated in different concentrations of KCl, NaCl and sucrose. Influx of K+ ions caused a change in the opening with consequent dis appearance of starch in the guard cells. The nature of the incubating solutions was found to exert a considerable influence on the regulation of opening. Solutions of similar osmotic potentials but containing different ions behaved dissimilarly.