Over-expression of an AT-hook gene, AHL22, delays flowering and inhibits the elongation of the hypocotyl in Arabidopsis thaliana.
Plant Mol Biol
; 71(1-2): 39-50, 2009 Sep.
Article
em En
| MEDLINE
| ID: mdl-19517252
ABSTRACT
The Arabidopsis genome encodes 29 AHL (AT-hook motif nuclear localized) proteins, but the function for most of them remains unknown. We report here a study of the AHL22 gene, which was originally identified as a gain-of-function allele that enhanced the phenotype of the cry1 cry2 mutant. AHL22 is a nuclear protein with the binding activity for an AT-rich DNA sequence. AHL22 overexpression delayed flowering and caused a constitutive photomorphogenic phenotype. The loss-of-function AHL22 mutant showed no clear phenotype on flowering, but slightly longer hypocotyls. However, silencing four AHL genes (AHL22, AHL18, AHL27, and AHL29) resulted in early flowering and enhanced ahl22-1 mutant phenotype on the growth of hypocotyls, suggesting genetic redundancy of AHL22 with other AHL genes on these plant developmental events. Further analysis showed that AHL22 controlled flowering and hypocotyl elongation might result from primarily the regulation of FT and PIF4 expression, respectively.
Texto completo:
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Bases de dados:
MEDLINE
Assunto principal:
Arabidopsis
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Hipocótilo
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Regulação da Expressão Gênica de Plantas
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Motivos AT-Hook
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Flores
Idioma:
En
Revista:
Plant Mol Biol
Assunto da revista:
BIOLOGIA MOLECULAR
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BOTANICA
Ano de publicação:
2009
Tipo de documento:
Article