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Loss of Function of a Rice brassinosteroid insensitive1 Homolog Prevents Internode Elongation and Bending of the Lamina Joint

Chizuko Yamamuro, Yoshihisa Ihara, Xiong Wu, Takahiro Noguchi, Shozo Fujioka, Suguru Takatsuto, Motoyuki Ashikari, Hidemi Kitano, Makoto Matsuoka
Chizuko Yamamuro
a Nagoya University, BioScience Center, Chikusa, Nagoya 464-8601, Japan
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Yoshihisa Ihara
b School of Agricultural Sciences, Nagoya University, Chikusa, Nagoya 464-8601, Japan
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Xiong Wu
b School of Agricultural Sciences, Nagoya University, Chikusa, Nagoya 464-8601, Japan
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Takahiro Noguchi
c Institute of Physical and Chemical Research (RIKEN), Wako, Saitama 351-0198, Japan
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Shozo Fujioka
c Institute of Physical and Chemical Research (RIKEN), Wako, Saitama 351-0198, Japan
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Suguru Takatsuto
d Department of Chemistry, Joetsu University of Education, Joetsu, Niigata 943-8512, Japan
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Motoyuki Ashikari
a Nagoya University, BioScience Center, Chikusa, Nagoya 464-8601, Japan
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Hidemi Kitano
b School of Agricultural Sciences, Nagoya University, Chikusa, Nagoya 464-8601, Japan
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Makoto Matsuoka
a Nagoya University, BioScience Center, Chikusa, Nagoya 464-8601, Japan
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  • For correspondence: j45751a@nucc.cc.nagoya-u.ac.jp

Published September 2000. DOI: https://doi.org/10.1105/tpc.12.9.1591

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  • © 2000 American Society of Plant Physiologists

Abstract

Brassinosteroids (BRs) are plant growth–promoting natural products required for plant growth and development. Physiological studies have demonstrated that exogenous BR, alone or in combination with auxin, enhance bending of the lamina joint of rice. However, little is known about the function of endogenous BR in rice or other grass species. We report here the phenotypical and molecular characterization of a rice dwarf mutant, d61, that is less sensitive to BR compared to the wild type. We cloned a rice gene, OsBRI1, with extensive sequence similarity to that of the Arabidopsis BRI gene, which encodes a putative BR receptor kinase. Linkage analysis showed that the OsBRI1 gene is closely linked to the d61 locus. Single nucleotide substitutions found at different sites of the d61 alleles would give rise to amino acid changes in the corresponding polypeptides. Furthermore, introduction of the entire OsBRI1 coding region, including the 5′ and 3′ flanking sequences, into d61 plants complemented the mutation to display the wild-type phenotype. Transgenic plants carrying the antisense strand of the OsBRI1 transcript showed similar or even more severe phenotypes than those of the d61 mutants. Our results show that OsBRI1 functions in various growth and developmental processes in rice, including (1) internode elongation, by inducing the formation of the intercalary meristem and the longitudinal elongation of internode cells; (2) bending of the lamina joint; and (3) skotomorphogenesis.

  • Received April 17, 2000.
  • Accepted June 12, 2000.
  • Published September 1, 2000.
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Loss of Function of a Rice brassinosteroid insensitive1 Homolog Prevents Internode Elongation and Bending of the Lamina Joint
Chizuko Yamamuro, Yoshihisa Ihara, Xiong Wu, Takahiro Noguchi, Shozo Fujioka, Suguru Takatsuto, Motoyuki Ashikari, Hidemi Kitano, Makoto Matsuoka
The Plant Cell Sep 2000, 12 (9) 1591-1605; DOI: 10.1105/tpc.12.9.1591

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Loss of Function of a Rice brassinosteroid insensitive1 Homolog Prevents Internode Elongation and Bending of the Lamina Joint
Chizuko Yamamuro, Yoshihisa Ihara, Xiong Wu, Takahiro Noguchi, Shozo Fujioka, Suguru Takatsuto, Motoyuki Ashikari, Hidemi Kitano, Makoto Matsuoka
The Plant Cell Sep 2000, 12 (9) 1591-1605; DOI: 10.1105/tpc.12.9.1591
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The Plant Cell Online: 12 (9)
The Plant Cell
Vol. 12, Issue 9
Sep 2000
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