NDLI: A Clock- and Light-Regulated Gene That Links the Circadian Oscillator to LHCB Gene Expression

Content Provider	PubMed Central
Author	Xu, Yao Johnson, Carl Hirschie
Copyright Year	2001
Abstract	We have identified and characterized a novel tobacco gene, called ZGT (from the Chinese phrase zhong guang tiaokong, or clock and light controlled), that is regulated by the circadian clock and light. ZGT transcripts have alternate forms that are differentially expressed in different tissues. ZGT is expressed rhythmically in light/dark cycles and in constant light. Constitutive expression of ZGT sustains the expression of the clock-controlled LHCB11 gene in constant darkness, when it would normally dampen, but does not affect LHCB11 expression in constant light. ZGT expression is induced rapidly by light, and overexpression of ZGT increases the sensitivity of the circadian oscillator to brief light pulses. The ZGT promoter includes a G-box motif that is found in many light-regulated promoters in plants and is the same as the E box described for rhythmically regulated promoters of animal circadian clock genes. The ZGT promoter also includes “evening element” motifs that are correlated with circadian control of plant genes. We postulate that light- and clock-regulated expression of ZGT acts as a coupling agent between the central circadian oscillator and rhythmic LHCB1*1 expression and that it may function as a component in plant phototransduction pathways.
Starting Page	1411
File Format	PDF
ISSN	1532298X
e-ISSN	1532298X
Journal	The Plant Cell
Issue Number	6
Volume Number	13
Language	English
Publisher	American Society of Plant Physiologists
Publisher Date	2001-06-01
Access Restriction	Open
Rights Holder	American Society of Plant Physiologists
Subject Keyword	Research in Higher Education
Content Type	Text
Resource Type	Article
Subject	Cell Biology Plant Science

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