The role of the kinase OXI1 in cadmium- and copper-induced molecular responses in Arabidopsis thaliana.
Plant Cell Environ
; 36(6): 1228-38, 2013 Jun.
Article
en En
| MEDLINE
| ID: mdl-23278806
ABSTRACT
The hypothesis that mitogen-activated protein kinase (MAPK) signalling is important in plant defences against metal stress has become accepted in recent years. To test the role of oxidative signal-inducible kinase (OXI1) in metal-induced oxidative signalling, the responses of oxi1 knockout lines to environmentally realistic cadmium (Cd) and copper (Cu) concentrations were compared with those of wild-type plants. A relationship between OXI1 and the activation of lipoxygenases and other initiators of oxylipin production was observed under these stress conditions, suggesting that lipoxygenase-1 may be a downstream component of OXI1 signalling. Metal-specific differences in OXI1 action were observed. For example, OXI1 was required for the up-regulation of antioxidative defences such as catalase in leaves and Fe-superoxide dismutase in roots, following exposure to Cu, processes that may involve the MEKK1-MKK2-WRKY25 cascade. Moreover, the induction of Cu/Zn superoxide dismutases in Cu-exposed leaves was regulated by OXI1 in a manner that involves fluctuations in the expression of miRNA398. These observations contrast markedly with the responses to Cd exposure, which also involves OXI1-independent pathways but rather involves changes in components mediating intracellular communication.
Texto completo:
1
Bases de datos:
MEDLINE
Asunto principal:
Cadmio
/
Proteínas Serina-Treonina Quinasas
/
Arabidopsis
/
Cobre
/
Sistema de Señalización de MAP Quinasas
/
Proteínas de Arabidopsis
Idioma:
En
Revista:
Plant Cell Environ
Asunto de la revista:
BOTANICA
Año:
2013
Tipo del documento:
Article
País de afiliación:
Bélgica