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First published online August 26, 2005; 10.1104/pp.105.064444

Plant Physiology 139:448-457 (2005)
© 2005 American Society of Plant Biologists

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DEVELOPMENT AND HORMONE ACTION

A Brassinosteroid-Hypersensitive Mutant of BAK1 Indicates That a Convergence of Photomorphogenic and Hormonal Signaling Modulates Phototropism1

Craig W. Whippo and Roger P. Hangarter*

Department of Biology, Indiana University, Bloomington, Indiana 47405–7107

The phototropic response of Arabidopsis (Arabidopsis thaliana) is induced by the phototropin photoreceptors and modulated by the cryptochrome and phytochrome photoreceptors. Downstream of these photoreceptors, asymmetric lateral redistribution of auxin underlies the differential growth, which results in phototropism. Historical physiological evidence and recent analysis of hormone-induced gene expression demonstrate that auxin and brassinosteroid signaling function interdependently. Similarly, in this study we report evidence that interactions between brassinosteroids and auxin signaling modulate phototropic responsiveness. We found that elongated, a previously identified photomorphogenesis mutant, enhances high-light phototropism and represents a unique allele of BAK1/SERK3, a receptor kinase implicated in brassinosteroid perception. Altogether, our results support the hypothesis that phototropic responsiveness is modulated by inputs that influence control of auxin response factor-mediated transcription.

1 This work was supported by the National Science Foundation (grant no. IBN–0080783) and the Department of Energy (grant no. DE–FG02–01ER15223).

Article, publication date, and citation information can be found at www.plantphysiol.org/cgi/doi/10.1104/pp.105.064444.

* Corresponding author; e-mail rhangart{at}indiana.edu; fax 812–855–6082.

Received April 19, 2005; returned for revision June 6, 2005; accepted June 14, 2005.




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