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Published on January 11, 2006; 10.1104/pp.105.072330

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Received October 3, 2005
Returned for revision November 8, 2005
Accepted December 19, 2005

The role of OsBRI1 and its homologous genes, OsBRL1 and OsBRL3 in rice

Ayako Nakamura , Shozo Fujioka , Hidehiko Sunohara , Noriko Kamiya , Zhi Hong , Yoshiaki Inukai , Kotaro Miura , Suguru Takatsuto , Shigeo Yoshida , Miyako Ueguchi-Tanaka , Yasuko Hasegawa , Hidemi Kitano , and Makoto Matsuoka *

Bioscience and Biotechnology Center, Nagoya University Chikusa, Nagoya 464-8601, Japan
Plant Function Lab, RIKEN, Wako, Saitama 351-0198, Japan
Plant Genet. Lab., Natl. Inst. Genet. Mishima, Shizuoka 411-8504, Japan
Department of Chemistry, Joetsu University of Education, Joetsu-shi, Niigata 943-8512, Japan

* Corresponding author; email: makoto{at}nuagr1.agr.nagoya-u.ac.jp.

Since first identifying two alleles of a rice brassinosteroid (BR)-insensitive mutant, d61, that were also defective in an orthologous gene in Arabidopsis BRI1, we have isolated eight additional alleles, including null mutations, of the rice BRI1 gene OsBRI1. The most severe mutant, d61-4, exhibited severe dwarfism and twisted leaves, although pattern formation and differentiation were normal. This severe shoot phenotype was caused mainly by a defect in cell elongation and the disturbance of cell division after the determination of cell fate. In contrast to its severe shoot phenotype, the d61-4 mutant had a mild root phenotype. Concomitantly, the accumulation of castasterone, the active BR in rice, was up to 30-fold greater in the shoots, while only 1.5-fold greater in the roots. The homologous genes for OsBRI1, OsBRL1 and OsBRL3, were highly expressed in roots, but weakly expressed in shoots, and their expression was higher in d61-4 than in the wild type. Based on these observations, we conclude that OsBRI1 is not essential for pattern formation or organ initiation, but is involved in organ development through controlling cell division and elongation. In addition, OsBRL1 and OsBRL3 are at least partly involved in BR perception in the roots.




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