Overexpression of Arabidopsis ATX1 retards plant growth under severe copper deficiency.
Plant Signal Behav
; 7(9): 1082-3, 2012 Sep 01.
Article
en En
| MEDLINE
| ID: mdl-22899077
ABSTRACT
In a previous study, we demonstrated that Arabidopsis Antioxidant Protein1 (ATX1) plays an essential role in copper (Cu) homeostasis, conferring tolerance to both excess and subclinically deficient Cu. The Cu-binding motif MXCXXC was required for the physiological function of ATX1. In this study, we found that overexpression of ATX1 resulted in hypersensitivity to severe Cu deficiency despite enhancing tolerance to subclinical Cu deficiency. However, overexpression of mutated ATX1, replacing the Cu-binding motif MXCXXC with MXGXXG, abolished the hypersensitivity, for no differences from the wild type under the same conditions. Thus, the expression of ATX1 must be cautiously regulated to avoid homeostatic imbalance with the over-chelation of Cu.
Texto completo:
1
Colección:
01-internacional
Base de datos:
MEDLINE
Asunto principal:
Estrés Fisiológico
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Factores de Transcripción
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Expresión Génica
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Genes de Plantas
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Arabidopsis
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Regulación de la Expresión Génica de las Plantas
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Cobre
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Proteínas de Arabidopsis
Idioma:
En
Revista:
Plant Signal Behav
Asunto de la revista:
BOTANICA
/
FISIOLOGIA
Año:
2012
Tipo del documento:
Article
País de afiliación:
Taiwán