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Possible involvement of phospholipase A 2 in light signal transduction of guard cells of Commelina communis
Author(s) -
Suh SuJeong,
Park Jounggun,
Lee Youngsook
Publication year - 1998
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 - 10.1034/j.1399-3054.1998.1040303.x
Subject(s) - guard cell , signal transduction , phospholipase c , phospholipase a2 , polyunsaturated fatty acid , second messenger system , microbiology and biotechnology , biophysics , phospholipid , transduction (biophysics) , biology , biochemistry , chemistry , botany , fatty acid , membrane , enzyme
Polyunsaturated fatty acids induce stomatal opening (Y. Lee, H. Lee, R. C. Crain, A. Lee and S. J. Korn. 1994. Cell Signal. 6: 181–186), but it is not known whether they function as second messengers in guard cells exposed to signals that open stomata. To test the hypothesis that phospholipase A 2 (PLA 2 ), which produces fatty acids and lysophospholipids, is involved in light signal transduction in guard cells, we treated epidermal peels of Commelina communis L. with PLA 2 inhibitors and followed the changes in stomatal apertures in response to light. Stomatal opening by white, blue, or red light was inhibited by 2–3 different PLA 2 inhibitors in concentration ranges that have been reported to inhibit PLA 2 activity. However, the PLA 2 inhibitors could not block stomatal opening induced by a polyunsaturated fatty acid. These results suggest that PLA 2 functions as a signal transducer for both blue and red light in guard cells.