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PLANT CELL 14 (12): 3163-3176

Copyright © 2002 by the American Society of Plant Physiologists.

Cloning the Tomato Curl3 Gene Highlights the Putative Dual Role of the Leucine-Rich Repeat Receptor Kinase tBRI1/SR160 in Plant Steroid Hormone and Peptide Hormone Signaling

Teresa Montoya1,a, Takahito Nomura1,a,b, Kerrie Farrara, Tsuyoshi Kanetac, Takao Yokotab, and Gerard J. Bishop2,a

a Institute of Biological Sciences, University of Wales Aberystwyth, Aberystwyth SY23 3DA, United Kingdom
b Department of Biosciences, Teikyo University, Utsunomiya 320-8551, Japan
c Department of Biology and Earth Sciences, Faculty of Science, Ehime University, Matsuyama 790-8577, Japan

2 To whom correspondence should be addressed. E-mail gdb{at}aber.ac.uk; fax 44-(0)1970-622350

Abstract: Brassinosteroids (BRs) are plant steroid hormones that are essential for normal plant development. To gain better understanding of the conservation of BR signaling, the partially BR-insensitive tomato mutant altered brassinolide sensitivity1 (abs1) was identified and found to be a weak allele at the curl3 (cu3) locus. BR content is increased in both of these mutants and is associated with increased expression of Dwarf. The tomato homolog of the Arabidopsis Brassinosteroid Insensitive1 Leu-rich repeat (LRR) receptor-like kinase, named tBri1, was isolated using degenerate primers. Sequence analysis of tBRI1 in the mutants cu3 and abs1 revealed that cu3 is a nonsense mutant and that abs1 is a missense mutant. A comparison of BRI1 homolog sequences highlights conserved features of BRI1 sequences, with the LRRs in close proximity to the island domain showing more conservation than N-terminal LRRs. The most homologous sequences were found in the kinase and transmembrane regions. tBRI1 (SR160) also has been isolated as the putative receptor for systemin, a plant peptide hormone. This finding suggests a possible dual role for tBRI1 in steroid hormone and peptide hormone signaling.

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