UNSPECIFIED. (2004) Circadian rhythms of ethylene emission in Arabidopsis. PLANT PHYSIOLOGY, 136 (3). pp. 3751-3761. ISSN 0032-0889

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Abstract

Ethylene controls multiple physiological processes in plants, including cell elongation. Consequently, ethylene synthesis is regulated by internal and external signals. We show that a light-entrained circadian clock regulates ethylene release from unstressed, wild-type Arabidopsis (Arabidopsis thaliana) seedlings, with a peak in the mid-subjective day. The circadian clock drives the expression of multiple ACC SYNTHASE genes, resulting in peak RNA levels at the phase of maximal ethylene synthesis. Ethylene production levels are tightly correlated with ACC SYNTHASE 8 steady-state transcript levels. The expression of this gene is controlled by light, by the circadian clock, and by negative feedback regulation through ethylene signaling. In addition, ethylene production is controlled by the TIMING OF CAB EXPRESSION 1 and CIRCADIAN CLOCK ASSOCIATED 1 genes, which are critical for all circadian rhythms yet tested in Arabidopsis. Mutation of ethylene signaling pathways did not alter the phase or period of circadian rhythms. Mutants with altered ethylene production or signaling also retained normal rhythmicity of leaf movement. We conclude that circadian rhythms of ethylene production are not critical for rhythmic growth.

Item Type:	Journal Article
Subjects:	S Agriculture > SB Plant culture
Journal or Publication Title:	PLANT PHYSIOLOGY
Publisher:	AMER SOC PLANT BIOLOGISTS
ISSN:	0032-0889
Date:	November 2004
Volume:	136
Number:	3
Number of Pages:	11
Page Range:	pp. 3751-3761
Identification Number:	10.1104/pp.104.042523
Publication Status:	Published
URI:	http://wrap.warwick.ac.uk/id/eprint/7727

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