AOBPreview originally published online on March 7, 2005
Annals of Botany 2005 95(6):901-915; doi:10.1093/aob/mci100
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INVITED REVIEW |
Ethylene Signal Transduction
Department of Biological Sciences, Dartmouth College, Hanover, NH 03755, USA
* For correspondence. E-mail george.e.schaller{at}dartmouth.edu
Received: 11 November 2004 Returned for revision: 11 December 2004 Accepted: 17 December 2004 Published electronically: 7 March 2005
• Background The phytohormone ethylene is a key regulator of plant growth and development. Components of the pathway for ethylene signal transduction were identified by genetic approaches in Arabidopsis and have now been shown to function in agronomically important plants as well.
• Scope This review focuses on recent advances in our knowledge on ethylene signal transduction, in particular on recently proposed components of the pathway, on the interaction between the pathway components and on the roles of transcriptional and post-transcriptional regulation in ethylene signalling.
• Conclusions Data indicate that the site of ethylene perception is at the endoplasmic reticulum and point to the importance of protein complexes in mediating the initial steps in ethylene signal transduction. The expression level of pathway components is regulated by both transcriptional and post-transcriptional mechanisms, degradation of the transcription factor EIN3 being a primary means by which the sensitivity of plants to ethylene is regulated. EIN3 also represents a control point for cross-talk with other signalling pathways, as exemplified by the effects of glucose upon its expression level. Amplification of the initial ethylene signal is likely to play a significant role in signal transduction and several mechanisms exist by which this may occur based on properties of known pathway components. Signal output from the pathway is mediated in part by carefully orchestrated changes in gene expression, the breadth of these changes now becoming clear through expression analysis using microarrays.
Key words: Ethylene, signal transduction, Arabidopsis thaliana, receptor, ETR1, CTR1, protein complex, transcriptional regulation, post-transcriptional regulation
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