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Plant Physiology 67:12-16 (1981)
© 1981 American Society of Plant Biologists

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Articles

Presence of Both Photosystems in Guard Cells of Vicia faba L

IMPLICATIONS FOR ENVIRONMENTAL SIGNAL PROCESSING 1

William H. Outlaw, Jr.2,3, Berger C. Mayne4, Vincent E. Zenger2 and Jill Manchester2

2 Plant Biology Program, Department of Biology, Washington University, Saint Louis, Missouri 63130, 4 C. F. Kettering Research Laboratory, Yellow Springs, Ohio 45387

A new procedure is reported for high-yield isolation of guard cell protoplasts from Vicia faba L. Delayed light emission and P700 content plus absorption and fluorescence emission spectra of these protoplast extracts are reported. It is concluded that both photosystems are present. The presence of photosystem II and the absence of the reductive-step enzyme of the Calvin-Benson Cycle (Outlaw WH Jr, J Manchester, CH DiCamelli, DD Randall, B Rapp, GM Veith 1979 Proc Natl Acad Sci USA 76: 6371-6375) in a cell has no precedent in the literature. It is speculated that noncyclic photosynthetic electron flow is an environmental sensor which causes stomata to remain open in light.

3 Present Address: Department of Biological Sciences, Florida State University, Tallahassee, Florida 32306.

1 This research was supported by Grant 5901-0410-8-0130-0 (to B. C. M.) from the United States Department of Agriculture-Science and Education Administration and by a grant from the National Science Foundation (to W. H. O.). This paper is contribution No. 711 from the C. F. Kettering Research Laboratory.




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Copyright © 1981 by the American Society of Plant Biologists