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Abstract
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Environmental and genetic effects on circadian clock-regulated gene expression in Arabidopsis.

J A Kreps, A E Simon
J A Kreps
Department of Biochemistry and Molecular Biology, University of Massachusetts, Amherst 01003, USA.
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A E Simon
Department of Biochemistry and Molecular Biology, University of Massachusetts, Amherst 01003, USA.
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Published March 1997. DOI: https://doi.org/10.1105/tpc.9.3.297

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Abstract

Expression patterns of the cold-circadian rhythm-RNA binding (CCR) and chlorophyll a/b binding (CAB) protein genes have circadian rhythms with phases that are different from each other and are affected differently by cold (4 degrees C) treatment. Cycling of CCR and CAB RNA levels was observed in Arabidopsis seedlings grown for 5 days at 4 degrees C under a light/ dark photoperiod, although the cycling had reduced amplitude compared with normal growth conditions (20 degrees C). CCR RNA levels were elevated in the cold, whereas CAB RNA levels were reduced in the cold relative to levels in control seedlings. Cold pulses (4 degrees C for 12 or 20 hr) under continuous light affected the rhythms of CCR and CAB RNA levels in similar ways. The 12-hr cold pulse caused a 4-hr phase delay in both rhythms, whereas the 20-hr cold pulse resulted in a 12-hr phase delay in both rhythms. The timing of CAB expression 1 (toc1) mutation shortened the period of the CCR rhythm, matching previous results for the regulation of the CAB-luciferase (CAB-luc) transgene in this mutant. The results suggest that CCR and CAB share clock machinery but are regulated by downstream components that are affected differently by the cold. Also, the circadian clock regulating these genes in Arabidopsis has a cold-sensitive phase under continuous light conditions.

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Environmental and genetic effects on circadian clock-regulated gene expression in Arabidopsis.
J A Kreps, A E Simon
The Plant Cell Mar 1997, 9 (3) 297-304; DOI: 10.1105/tpc.9.3.297

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Environmental and genetic effects on circadian clock-regulated gene expression in Arabidopsis.
J A Kreps, A E Simon
The Plant Cell Mar 1997, 9 (3) 297-304; DOI: 10.1105/tpc.9.3.297
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The Plant Cell
Vol. 9, Issue 3
Mar 1997
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