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Published on July 11, 2002; 10.1104/pp.003418

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Received January 30, 2002
Returned for revision March 18, 2002
Accepted May 5, 2002

The out of phase 1 Mutant Defines a Role for PHYB in Circadian Phase Control in Arabidopsis

Patrice A. Salomé , Todd P. Michael , Ellen V. Kearns , Arthur G. Fett-Neto , Robert A. Sharrock , and C. Robertson McClung *

Department of Biological Sciences, 6044 Gilman Laboratories, Dartmouth College, Hanover, New Hampshire 03755--3576 (P.A.S., T.P.M., E.V.K., A.G.F.-N., C.R.M.); and Department of Plant Sciences and Plant Pathology, 119 ABS Building, Montana State University, Bozeman, Montana 59717--3140 (R.A.S.)

* Corresponding author; email: mcclung{at}dartmouth.edu.

Arabidopsis displays circadian rhythms in stomatal aperture, stomatal conductance, and CO2 assimilation, each of which peaks around the middle of the day. The rhythmic opening and closing of stomata confers a rhythm in sensitivity and resistance, respectively, to the toxic gas sulfur dioxide. Using this physiological assay as a basis for a mutant screen, we isolated mutants with defects in circadian timing. Here, we characterize one mutant, out of phase 1 (oop1), with the circadian phenotype of altered phase. That is, the timing of the peak (acrophase) of multiple circadian rhythms (leaf movement, CO2 assimilation, and LIGHT-HARVESTING CHLOROPHYLL a/b-BINDING PROTEIN transcription) is early with respect to wild type, although all circadian rhythms retain normal period length. This is the first such mutant to be characterized in Arabidopsis. oop1 also displays a strong photoperception defect in red-light characteristic of phytochrome B (phyB) mutants. The oop1 mutation is a nonsense mutation of PHYB that results in a truncated protein of 904 amino acids. The defect in circadian phasing is seen in seedlings entrained by a light-dark cycle but not in seedlings entrained by a temperature cycle. Thus, PHYB contributes light information critical for proper determination of circadian phase.




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