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Plant Physiol ; 132(4): 1728-38, 2003 Aug.
Artigo em Inglês | MEDLINE | ID: mdl-12913131

RESUMO

We tested whether signaling pathways induced by systemin, oligosaccharide elicitors (OEs), and ultraviolet (UV)-B radiation share common components in Lycopersicon peruvianum suspension-cultured cells. These stress signals all induce mitogen-activated protein kinase (MAPK) activity. In desensitization assays, we found that pretreatment with systemin and OEs transiently reduced the MAPK response to a subsequent treatment with the same or a different elicitor. In contrast, MAPK activity in response to UV-B increased after pretreatment with systemin and OEs. These experiments demonstrate the presence of signaling components that are shared by systemin, OEs, and UV-B. Based on desensitization assays, it is not clear if the same or different MAPKs are activated by different stress signals. To identify specific stress-responsive MAPKs, we cloned three MAPKs from a tomato (Lycopersicon esculentum) leaf cDNA library, generated member-specific antibodies, and performed immunocomplex kinase assays with extracts from elicited L. peruvianum cells. Two highly homologous MAPKs, LeMPK1 and LeMPK2, were activated in response to systemin, four different OEs, and UV-B radiation. An additional MAPK, LeMPK3, was only activated by UV-B radiation. The common activation of LeMPK1 and LeMPK2 by many stress signals is consistent with the desensitization assays and may account for substantial overlaps among stress responses. On the other hand, MAPK activation kinetics in response to elicitors and UV-B differed substantially, and UV-B activated a different set of LeMPKs than the elicitors. These differences may account for UV-B-specific responses.


Assuntos
Proteínas Quinases Ativadas por Mitógeno/metabolismo , Oligossacarídeos/agonistas , Peptídeos/farmacologia , Solanaceae/efeitos dos fármacos , Solanaceae/efeitos da radiação , Sequência de Aminoácidos , Células Cultivadas , Clonagem Molecular , Ativação Enzimática/efeitos da radiação , Regulação da Expressão Gênica de Plantas/efeitos dos fármacos , Regulação da Expressão Gênica de Plantas/efeitos da radiação , Sistema de Sinalização das MAP Quinases/efeitos dos fármacos , Sistema de Sinalização das MAP Quinases/efeitos da radiação , Proteínas Quinases Ativadas por Mitógeno/genética , Dados de Sequência Molecular , Oligossacarídeos/farmacologia , Solanaceae/citologia , Solanaceae/enzimologia , Fatores de Tempo , Raios Ultravioleta
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