|
|
|
|
|
|
|
||||
| Home Help Feedback Subscriptions Archive Search Table of Contents | ||||
First published online October 27, 2004
doi: 10.1242/10.1242/dev.01441
1 Graduate School of Agricultural and Life Sciences, University of Tokyo,
Bunkyo-ku, Tokyo 113-8657, Japan
2 Bioscience and Biotechnology Center, Nagoya University, Chikusa-ku, Nagoya
464-8601, Japan
3 Japan Tobacco Incorporated, Aoba-ku, Yokohama 227-8512, Japan
4 Graduate School of Science, University of Tokyo, Bunkyo-ku, Tokyo 113-8657,
Japan
* Author for correspondence (e-mail: ahirano{at}boil.s.u-tokyo.ac.jp)
Accepted 14 September 2004
The regulation of floral organ number is closely associated with floral meristem size. Mutations in the gene FLORAL ORGAN NUMBER1 (FON1) cause enlargement of the floral meristem in Oryza sativa (rice), resulting in an increase in the number of all floral organs. Ectopic floral organs develop in the whorl of each organ and/or in the additional whorls that form. Inner floral organs are more severely affected than outer floral organs. Many carpel primordia develop indeterminately, and undifferentiated meristematic tissues remain in the center in almost-mature flowers. Consistent with this result, OSH1, a molecular marker of meristematic indeterminate cells in rice, continues to be expressed in this region. Although floral meristems are strongly affected by the fon1-2 mutation, vegetative and inflorescence meristems are largely normal, even in this strong allele. We isolated the FON1 gene by positional cloning and found that it encodes a leucine-rich repeat receptor-like kinase most similar to CLAVATA1 (CLV1) in Arabidopsis thaliana. This suggests that a pathway similar to the CLV signaling system that regulates meristem maintenance in Arabidopsis is conserved in the grass family. Unlike CLV1, which is predominantly expressed in the L3 layer of the shoot meristem, FON1 is expressed throughout the whole floral meristem, suggesting that small modifications to the CLV signaling pathway may be required to maintain the floral meristem in rice. In addition, FON1 transcripts are detected in all meristems responsible for development of the aerial part of rice, suggesting that genes sharing functional redundancy with FON1 act in the vegetative and inflorescence meristems to mask the effects of the fon1 mutation.
Key words: CLV signaling, Floral meristem, FLORAL ORGAN NUMBER1, Flower development, Rice
This article has been cited by other articles:
|
|
 |
|
  Y. Ohmori, M. Abiko, A. Horibata, and H.-Y. Hirano A Transposon, Ping, is Integrated into Intron 4 of the DROOPING LEAF Gene of Rice, Weakly Reducing its Expression and Causing a Mild Drooping Leaf Phenotype Plant Cell Physiol., August 1, 2008; 49(8): 1176 - 1184. [Abstract] [Full Text] [PDF]
|
|
|
|
 |
|
 S. J. Dinka, M. A. Campbell, T. Demers, and M. N. Raizada Predicting the Size of the Progeny Mapping Population Required to Positionally Clone a Gene Genetics, August 1, 2007; 176(4): 2035 - 2054. [Abstract] [Full Text] [PDF]
|
|
|
|
 |
|
 E. Bortiri and S. Hake Flowering and determinacy in maize J. Exp. Bot., March 3, 2007; (2007) erm015v1. [Abstract] [Full Text] [PDF]
|
|
|
|
 |
|
 C. Dardick, J. Chen, T. Richter, S. Ouyang, and P. Ronald The Rice Kinase Database. A Phylogenomic Database for the Rice Kinome Plant Physiology, February 1, 2007; 143(2): 579 - 586. [Abstract] [Full Text] [PDF]
|
|
|
|
|
|
T. Suzaki, T. Toriba, M. Fujimoto, N. Tsutsumi, H. Kitano, and H.-Y. Hirano Conservation and Diversification of Meristem Maintenance Mechanism in Oryza sativa: Function of the FLORAL ORGAN NUMBER2 Gene Plant Cell Physiol., December 1, 2006; 47(12): 1591 - 1602. [Abstract] [Full Text] [PDF]
|
|
|
|
 |
|
 J. Nardmann and W. Werr The Shoot Stem Cell Niche in Angiosperms: Expression Patterns of WUS Orthologues in Rice and Maize Imply Major Modifications in the Course of Mono- and Dicot Evolution Mol. Biol. Evol., December 1, 2006; 23(12): 2492 - 2504. [Abstract] [Full Text] [PDF]
|
|
|
|
|
|
S. Moon, K.-H. Jung, D.-e. Lee, W.-Z. Jiang, H. J. Koh, M.-H. Heu, D. S. Lee, H. S. Suh, and G. An Identification of Active Transposon dTok, a Member of the hAT Family, in Rice Plant Cell Physiol., November 1, 2006; 47(11): 1473 - 1483. [Abstract] [Full Text] [PDF]
|
|
|
|
|
|
H. Chu, Q. Qian, W. Liang, C. Yin, H. Tan, X. Yao, Z. Yuan, J. Yang, H. Huang, D. Luo, et al. The FLORAL ORGAN NUMBER4 Gene Encoding a Putative Ortholog of Arabidopsis CLAVATA3 Regulates Apical Meristem Size in Rice Plant Physiology, November 1, 2006; 142(3): 1039 - 1052. [Abstract] [Full Text] [PDF]
|
|
|
|
 |
|
 F. E. Tax and A. Durbak Meristems in the movies: live imaging as a tool for decoding intercellular signaling in shoot apical meristems. PLANT CELL, June 1, 2006; 18(6): 1331 - 1337. [Full Text] [PDF]
|
|
|
|
|
|
T. Yamaguchi, D. Y. Lee, A. Miyao, H. Hirochika, G. An, and H.-Y. Hirano Functional Diversification of the Two C-Class MADS Box Genes OSMADS3 and OSMADS58 in Oryza sativa PLANT CELL, January 1, 2006; 18(1): 15 - 28. [Abstract] [Full Text] [PDF]
|
|
|
|
 |
|
 P. Bommert, C. Lunde, J. Nardmann, E. Vollbrecht, M. Running, D. Jackson, S. Hake, and W. Werr thick tassel dwarf1 encodes a putative maize ortholog of the Arabidopsis CLAVATA1 leucine-rich repeat receptor-like kinase Development, March 15, 2005; 132(6): 1235 - 1245. [Abstract] [Full Text] [PDF]
|
|
|
|
|
|
P. Bommert, N. Satoh-Nagasawa, D. Jackson, and H.-Y. Hirano Genetics and Evolution of Inflorescence and Flower Development in Grasses Plant Cell Physiol., January 15, 2005; 46(1): 69 - 78. [Abstract] [Full Text] [PDF]
|
|
