Control of EIR1 expression
Abstract
The regulation of auxin distribution within a plant is thought to play a critical role in both the control of plant morphogenesis and a variety of growth responses. With the characterization of proteins that appear to catalyze the transport of the phytohormone, the molecular tools for studying the regulation of auxin transport are now available. Specifically, analysis of the potential auxin efflux carrier ETHYLENE INSENSITIVE ROOT 1 (EIR1, also known as AGR, WAV6 and AtPIN2), demonstrated that EIR1 expression is regulated by light as well as by the phytohormones ethylene and auxin. Moreover, genes controlling auxin responses were found to regulate the expression of the putative auxin efflux carrier. One of the questions forthcoming, is, how all these different factors interact in the regulation of EIR1. Mutants defective in EIR1 were shown to exhibit alterations in root-specific responses to auxin, ethylene and light. Our findings suggest that eir1 defects might arise from a failure in the transcriptional and post-transcriptional regulation of EIR1 expression in response to these growth regulators. A characterization and functional dissection of cis- and trans-acting elements that control the impact of auxin ethylene and light on EIR1 expression is goal of this application. The outcome of these experiments should increase our current knowledge about mechanisms by which different growth regulators affect root growth via the regulation of a potential auxin efflux carrier.
keywords auxin gene expression phytohormone
Publikationen
PROPORZ1, a putative Arabidopsis transcriptional adaptor protein, mediates auxin and cytokinin signals in the control of cell proliferation.
Autoren: Sieberer, T, Seifert, G, Hauser, M-T and Luschnig, C Jahr: 2003
Conference & Workshop proceedings, paper, abstract
Project staff
Christian Luschnig
Assoc. Prof. Dr. Christian Luschnig
christian.luschnig@boku.ac.at
Tel: +43 1 47654-94230
Project Leader
01.03.2003 - 28.02.2006