|
|
|
|
|
|
|
||||
| Home Help Feedback Subscriptions Archive Search Table of Contents | ||||
First published online 11 April 2007
doi: 10.1242/dev.003103
| |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
1 Department of Biological Sciences and Temasek Life Sciences Laboratory,
National University of Singapore, Singapore 117543, Singapore.
2 Department of Plant Sciences, Tel Aviv University, Tel Aviv 69978,
Israel.
Author for correspondence (e-mail:
dbsyuhao{at}nus.edu.sg)
Accepted 13 March 2007
Flowering plants produce floral meristems in response to intrinsic and extrinsic flowering inductive signals. In Arabidopsis, the floral meristem identity genes LEAFY (LFY) and APETALA1 (AP1) are activated to play a pivotal role in specifying floral meristems during floral transition. We show here that the emerging floral meristems require AP1 to partly specify their floral identities by directly repressing a group of flowering time genes, including SHORT VEGETATIVE PHASE (SVP), AGAMOUS-LIKE 24 (AGL24) and SUPPRESSOR OF OVEREXPRESSION OF CO1 (SOC1). In wild-type plants, these flowering time genes are normally downregulated in emerging floral meristems. In the absence of AP1, these genes are ectopically expressed, transforming floral meristems into shoot meristems. By post-translational activation of an AP1-GR fusion protein and chromatin immunoprecipitation assays, we further demonstrate the repression of these flowering time genes by induced AP1 activity and in vivo AP1 binding to the cis-regulatory regions of these genes. These findings indicate that once AP1 is activated during the floral transition, it acts partly as a master repressor in floral meristems by directly suppressing the expression of flowering time genes, thus preventing the continuation of the shoot developmental program.
Key words: Floral meristem identity, APETALA1, Flowering time gene, Transcriptional regulation, Arabidopsis
CiteULike 
Complore 
Connotea 
Del.icio.us 
Digg 
Reddit 
Technorati 
Twitter What's this?
This article has been cited by other articles:
|
|
 |
|
  C. Liu, Z. Thong, and H. Yu Coming into bloom: the specification of floral meristems Development, October 15, 2009; 136(20): 3379 - 3391. [Abstract] [Full Text] [PDF]
|
|
|
|
 |
|
 B. Sun, Y. Xu, K.-H. Ng, and T. Ito A timing mechanism for stem cell maintenance and differentiation in the Arabidopsis floral meristem Genes & Dev., August 1, 2009; 23(15): 1791 - 1804. [Abstract] [Full Text] [PDF]
|
|
|
|
 |
|
 J. Adrian, S. Torti, and F. Turck From Decision to Commitment: The Molecular Memory of Flowering Mol Plant, July 1, 2009; 2(4): 628 - 642. [Abstract] [Full Text] [PDF]
|
|
|
|
 |
|
 V. F. Irish Evolution of petal identity J. Exp. Bot., July 1, 2009; 60(9): 2517 - 2527. [Abstract] [Full Text] [PDF]
|
|
|
|
|
|
E. Mutasa-Gottgens and P. Hedden Gibberellin as a factor in floral regulatory networks J. Exp. Bot., May 1, 2009; 60(7): 1979 - 1989. [Abstract] [Full Text] [PDF]
|
|
|
|
 |
|
 J. Diaz-Riquelme, D. Lijavetzky, J. M. Martinez-Zapater, and M. J. Carmona Genome-Wide Analysis of MIKCC-Type MADS Box Genes in Grapevine Plant Physiology, January 1, 2009; 149(1): 354 - 369. [Abstract] [Full Text] [PDF]
|
|
|
|
|
|
O. N. Danilevskaya, X. Meng, D. A. Selinger, S. Deschamps, P. Hermon, G. Vansant, R. Gupta, E. V. Ananiev, and M. G. Muszynski Involvement of the MADS-Box Gene ZMM4 in Floral Induction and Inflorescence Development in Maize Plant Physiology, August 1, 2008; 147(4): 2054 - 2069. [Abstract] [Full Text] [PDF]
|
|
|
|
|
|
Compiled by, F. Tooke, T. Chiurugwi, and N. Battey Flowering Newsletter bibliography for 2007 J. Exp. Bot., July 18, 2008; (2008) ern109v1. [Full Text] [PDF]
|
|
|
|
|
|
X. Hou, W.-W. Hu, L. Shen, L. Y. C. Lee, Z. Tao, J.-H. Han, and H. Yu Global Identification of DELLA Target Genes during Arabidopsis Flower Development Plant Physiology, July 1, 2008; 147(3): 1126 - 1142. [Abstract] [Full Text] [PDF]
|
|
|
|
|
|
F. Fornara, V. Gregis, N. Pelucchi, L. Colombo, and M. Kater The rice StMADS11-like genes OsMADS22 and OsMADS47 cause floral reversions in Arabidopsis without complementing the svp and agl24 mutants J. Exp. Bot., May 2, 2008; (2008) ern083v1. [Abstract] [Full Text] [PDF]
|
|
|
|
|
|
C. Liu, H. Chen, H. L. Er, H. M. Soo, P. P. Kumar, J.-H. Han, Y. C. Liou, and H. Yu Direct interaction of AGL24 and SOC1 integrates flowering signals in Arabidopsis Development, April 15, 2008; 135(8): 1481 - 1491. [Abstract] [Full Text] [PDF]
|
|
|
|
|
|
C. M. Alexandre and L. Hennig FLC or not FLC: the other side of vernalization J. Exp. Bot., April 4, 2008; (2008) ern070v1. [Abstract] [Full Text] [PDF]
|
|
|
|
 |
|
 T. Ito, K.-H. Ng, T.-S. Lim, H. Yu, and E. M. Meyerowitz The Homeotic Protein AGAMOUS Controls Late Stamen Development by Regulating a Jasmonate Biosynthetic Gene in Arabidopsis PLANT CELL, November 1, 2007; 19(11): 3516 - 3529. [Abstract] [Full Text] [PDF]
|
|
|
|
|
|
Y. Kobayashi and D. Weigel Move on up, it's time for change mobile signals controlling photoperiod-dependent flowering Genes & Dev., October 1, 2007; 21(19): 2371 - 2384. [Abstract] [Full Text] [PDF]
|
|
