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AOBPreview originally published online on January 4, 2007
Annals of Botany 2007 99(2):239-244; doi:10.1093/aob/mcl265
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© The Author 2007. Published by Oxford University Press on behalf of the Annals of Botany Company. All rights reserved. For Permissions, please email: journals.permissions@oxfordjournals.org

Mutual Regulation of Arabidopsis thaliana Ethylene-responsive Element Binding Protein and a Plant Floral Homeotic Gene, APETALA2

Taro Ogawa1, Hirofumi Uchimiya1,2 and Maki Kawai-Yamada1,3,*

1 Institute of Molecular and Cellular Biosciences, The University of Tokyo, 1-1-1 Yayoi, Bunkyo-ku, Tokyo 113-0032, Japan
2 Iwate Biotechnology Research Center, Kitakami, Iwate 024-0003, Japan
3 Japan Science and Technology Agency (JST), CREST, 4-1-8 Honcho, Kawaguchi, Saitama 332-0012, Japan

* For correspondence. E-mail mkawai{at}iam.u-tokyo.ac.jp

Received: 29 August 2006    Returned for revision: 5 October 2006    Accepted: 31 October 2006    Published electronically: 4 January 2007

BACKGROUND AND AIMS: It has previously been shown that Arabidopsis thaliana ethylene-responsive element binding protein (AtEBP) contributed to resistance to abiotic stresses. Interestingly, it has also been reported that expression of ethylene-responsive factor (ERF) genes including AtEBP were regulated by the activity of APETALA2 (AP2), a floral homeotic factor. AP2 is known to regulate expression of several floral-specific homeotic genes such as AGAMOUS. The aim of this study was to clarify the relationship between AP2 and AtEBP in gene expression.

METHODS: Northern blot analysis was performed on ap2 mutants, ethylene-related Arabidopsis mutants and transgenic Arabidopsis plants over-expressing AtEBP, and a T-DNA insertional mutant of AtEBP. Phenotypic analysis of these plants was performed.

KEY RESULTS: Expression levels of ERF genes such as AtEBP and AtERF1 were increased in ap2 mutants. Over-expression of AtEBP caused upregulation of AP2 expression in leaves. AP2 expression was suppressed by the null-function of ethylene-insensitive2 (EIN2), although AP2 expression was not affected by ethylene treatment. Loss of AtEBP function slightly reduced the average number of stamens.

CONCLUSIONS: AP2 and AtEBP are mutually regulated in terms of gene expression. AP2 expression was affected by EIN2 but was not regulated by ethylene treatment.

Key words: APETALA2, Arabidopsis thaliana, AtEBP, ERF, EIN2, EIN3


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