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Endogenous Diurnal and Nocturnal Activity of Guard Cells as Indicated by Stomatal Aperture and Protoplasmic Streaming
Author(s) -
Pallas J. E.
Publication year - 1969
Publication title -
physiologia plantarum
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.351
H-Index - 146
eISSN - 1399-3054
pISSN - 0031-9317
DOI - 10.1111/j.1399-3054.1969.tb07409.x
Subject(s) - guard cell , vicia faba , botany , nocturnal , biology , biophysics , chemistry , horticulture , ecology
The hourly stomatal apertures on epidermal strips of Antirrhinum majus, Rheum rhaponticum, Vicia faba , and Zebrina pendula fixed by Lloyd's technique were compared with the number of stomata found to contain streaming at the same time. With all four species there was an indication of an endogenously controlled rhythm in stomatal opening with both increases and decreases in aperture and streaming during daytime hours in either the light or dark. A similar endogenously activated rhythm was also found at night in Rheum and Vicia. Some relationships exist between changes in stomatal aperture and streaming. Streaming in guard cells may only be a byproduct of metabolism, but as such, it serves the useful purpose as a mixer of chemical activity.