Circadian Rhythm of Stomatal Movements in Epidermal Strips

Measurements were made of changes in stomatal pore widths in epidermal strips of leaves ofVicia faba and Commelina communis. Strips were incubated in dilute KCI solutions (1 and 10 mol m−3) flowing through a perfusion chamber on the stage of a microscope and kept for 4 d in continuous light. Circadi...

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Bibliographic Details
Published in:Journal of experimental botany 1993-11, Vol.44 (11), p.1649-1652
Main Authors: MEIDNER, H., WILLMER, C. M.
Format: Article
Language:English
Subjects:
Agronomy. Soil science and plant productions
Biological and medical sciences
Circadian rhythm
Cireadian rhythm
Epidermal cells
epidermal strips
Epidermis
Fundamental and applied biological sciences. Psychology
Guard cells
Leaves
Mesophyll
Perfusion
Plant physiology and development
Potassium
Stomata
Stomatal movement
Water and solutes. Absorption, translocation and permeability
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Summary:Measurements were made of changes in stomatal pore widths in epidermal strips of leaves ofVicia faba and Commelina communis. Strips were incubated in dilute KCI solutions (1 and 10 mol m−3) flowing through a perfusion chamber on the stage of a microscope and kept for 4 d in continuous light. Circadian rhythms of stomatal apertures were detected in both species. Although the amplitude was small it was statistically significant. It is concluded that at least partof the mechanism for the stomatal rhythm resides in the epidermis, probably in the guard cells.
ISSN:0022-0957
1460-2431
DOI:10.1093/jxb/44.11.1649