The fully linked HTML version of this article has now been published.
Development ePress online publication date 11 Apr 2007
doi: 10.1242/dev.003103
Research article
Specification of Arabidopsis floral meristem identity by repression of flowering time genes
Chang Liu,
Jing Zhou,
Keren Bracha-Drori,
Shaul Yalovsky,
Toshiro Ito,
and
Hao Yu*
* Author for correspondence (e-mail: dbsyuhao{at}nus.edu.sg)
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.
This article has been cited by other articles:
|
|
|
|
 
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]
|
|
|
© The Company of Biologists Ltd 2007
