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Plant Physiology 98:879-886 (1992)
© 1992 American Society of Plant Biologists

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Environmental and Stress Physiology

Circadian Rhythms of Chemotaxis to Ammonium and of Methylammonium Uptake in Chlamydomonas 1

Thomas Edward Byrne, Marion Robert Wells and Carl Hirschie Johnson

Department of Biology, Middle Tennessee State University, Murfreesboro, Tennessee 37132, Department of Biology, Vanderbilt University, Nashville, Tennessee 37235

Chlamydomonas reinhardtii expresses a well-documented circadian rhythm of phototaxis, which peaks in the subjective daytime. We find that vegetative cells also express circadian rhythms of chemotaxis to ammonium and ammonium uptake (as gauged by uptake of [14C]methylammonium). The chemotaxis rhythm peaks in the subjective night. Methylammonium uptake is light dependent, and its rhythm peaks at subjective dawn. Unlike vegetative cells, gametes are not attracted to ammonium. We believe this to be the first report of a circadian rhythm of chemotaxis.

1 This work was supported by a grant from the National Institute of Mental Health to C.H.J. (MH 43836).




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Copyright © 1992 by the American Society of Plant Biologists