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First published online October 14, 2004
doi: 10.1242/10.1242/dev.01403

Development 131, 5341-5351 (2004)
Published by The Company of Biologists 2004
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BRL1 and BRL3 are novel brassinosteroid receptors that function in vascular differentiation in Arabidopsis

Ana Caño-Delgado1,*, Yanhai Yin1,*, Cong Yu2,*, Dionne Vafeados1, Santiago Mora-García1, Jin-Chen Cheng2, Kyoung Hee Nam2,3, Jianming Li2,{dagger} and Joanne Chory1,{dagger}

1 Howard Hughes Medical Institute and Plant Biology Laboratory, The Salk Institute for Biological Studies, 10010 N. Torrey Pines Rd, La Jolla, CA 92037, USA
2 Department of Molecular, Cellular, and Developmental Biology, University of Michigan, 830 North University, Ann Arbor, MI 48109-1048, USA
3 Major in Biological Science, Sookmyung Women's University, 53-12 Chungpa-dong 2 Ka, Yongsan-gu, Seoul, 140-742, Korea

{dagger} Authors for correspondence (e-mail: chory{at}salk.edu; jian{at}umich.edu)

Accepted 16 August 2004

Plant steroid hormones, brassinosteroids (BRs), are perceived by the plasma membrane-localized leucine-rich-repeat-receptor kinase BRI1. Based on sequence similarity, we have identified three members of the BRI1 family, named BRL1, BRL2 and BRL3. BRL1 and BRL3, but not BRL2, encode functional BR receptors that bind brassinolide, the most active BR, with high affinity. In agreement, only BRL1 and BRL3 can rescue bri1 mutants when expressed under the control of the BRI1 promoter. While BRI1 is ubiquitously expressed in growing cells, the expression of BRL1 and BRL3 is restricted to non-overlapping subsets of vascular cells. Loss-of-function of brl1 causes abnormal phloem:xylem differentiation ratios and enhances the vascular defects of a weak bri1 mutant. bri1 brl1 brl3 triple mutants enhance bri1 dwarfism and also exhibit abnormal vascular differentiation. Thus, Arabidopsis contains a small number of BR receptors that have specific functions in cell growth and vascular differentiation.

Key words: Arabidopsis, Brassinosteroids, Vascular differentiation


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