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PLANT PHYSIOLOGY , Vol 102, Issue 1 95-100, Copyright © 1993 by American Society of Plant Biologists

CELL BIOLOGY AND SIGNAL TRANSDUCTION

Stomatal Opening Is Induced in Epidermal Peels of Commelina communis L. by GTP Analogs or Pertussis Toxin

H. J. Lee, E. B. Tucker, R. C. Crain and Y. Lee
Department of Life Science, Pohang Institute of Science and Technology, Pohang, Korea (H.J.L., Y.L.)

Pretreatment with pertussis toxin or microinjection of guanosine- 5[prime]-(3-thiotriphosphate) (GTP-[gamma]-S) into guard cells in peeled epidermis of Commelina communis L. promoted stomatal opening under subsaturating white light. Guanosine-5[prime]-(2-thiodiphosphate) (GDP-[beta]-S) and adenosine-5[prime]-(3-thiotriphosphate) (ATP-[gamma]-S) did not change stomatal aperture under identical conditions. These results indicate that G proteins may be involved in the regulation of stomatal opening.


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Copyright © 1993 by the American Society of Plant Biologists