Circadian Rhythms of Chemotaxis to Ammonium and of Methylammonium Uptake in Chlamydomonas | Zendy

Thomas E. Byrne | Zendy; Marion Robert Wells | Zendy; Carl Hirschie Johnson | Zendy

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

Author(s) -

Thomas E. Byrne,

Marion Robert Wells,

Carl Hirschie Johnson

Publication year - 1992

Publication title -

plant physiology

Language(s) - English

Resource type - Journals

SCImago Journal Rank - 3.554

H-Index - 312

eISSN - 1532-2548

pISSN - 0032-0889

DOI - 10.1104/pp.98.3.879

Subject(s) - circadian rhythm , chlamydomonas reinhardtii , ammonium , chemotaxis , rhythm , chlamydomonas , biology , phototaxis , circadian clock , biophysics , botany , chemistry , neuroscience , biochemistry , medicine , receptor , gene , organic chemistry , mutant

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 [(14)C]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.

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