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JXB Advance Access published online on June 1, 2007
Journal of Experimental Botany, doi:10.1093/jxb/erm087
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© The Author [2007]. Published by Oxford University Press [on behalf of the Society for Experimental Biology]. All rights reserved. For Permissions, please e-mail: journals.permissions@oxfordjournals.org

RESEARCH PAPER

Functional cross-talk between two-component and phytochrome B signal transduction in Arabidopsis

Virtudes Mira-Rodado1, Uta Sweere2, Christopher Grefen1, Tim Kunkel2, Erzsébet Fejes3, Ferenc Nagy3, Eberhard Schäfer2 and Klaus Harter1,*

1Zentrum für Molekularbiologie der Pflanzen/Pflanzenphysiologie, Universität Tübingen, Auf der Morgenstelle 1, D-72076 Tübingen, Germany
2Institut für Biologie II/Botanik, Universität Freiburg, Schänzlestrasse 1, D-79104 Freiburg, Germany
3Plant Biology Institute, Biological Research Center, PO Box 521, H-6726 Szeged, Hungary

* To whom correspondence should be addressed. E-mail: klaus.harter{at}uni-tuebingen.de

The A-type response regulator ARR4 is an element in the two-component signalling network of Arabidopsis. ARR4 interacts with the N-terminus of the red/far-red light photoreceptor phytochrome B (phyB) and functions as a modulator of photomorphogenesis. In concert with other A-type response regulators, ARR4 also participates in the modulation of the cytokinin response pathway. Here evidence is presented that ARR4 directly modulates the activity state of phyB in planta, not only under inductive but also under extended irradiation with red light. Mutation of the phosphorylatable aspartate to asparagine within the receiver domain creates a version of ARR4 that negatively affects photomorphogenesis. Additional evidence suggests that ARR4 activity is regulated by a phosphorelay mechanism that depends on the AHK family of cytokinin receptors. Accordingly, the ability of ARR4 to function on phyB is modified by exogenous application of cytokinin. These results implicate a cross-talk between cytokinin and light signalling mediated by ARR4. This cross-talk enables the plant to adjust light reponsiveness to endogenous requirements in growth and development.

Key words: ARR4, cytokinin, light, phytochrome B, signal integration, two-component signalling

Received 12 February 2007; Revised 20 March 2007 Accepted 26 March 2007


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