IBR   13079
INSTITUTO DE BIOLOGIA MOLECULAR Y CELULAR DE ROSARIO
Unidad Ejecutora - UE
artículos
Título:
ROS signaling in the hypersensitive response: when, where and what for?
Autor/es:
ZURBRIGGEN, M D; CARRILLO, N; HAJIREZAEI, M R
Revista:
Plant signaling and behavior
Editorial:
Landes
Referencias:
Lugar: Austin TX; Año: 2010 vol. 5 p. 393 - 396
ISSN:
1559-2316
Resumen:
Plants generally react to the attackof non-host and incompatible hostmicroorganisms by inducing pathogenesis-related (PR) genes and localised celldeath (LCD) at the site of infection, aprocess collectively known as the hypersensitiveresponse (HR). Reactive oxygenspecies (ROS) are generated in varioussub-cellular compartments shortly afterpathogen recognition, and proposed tocue subsequent orchestration of the HR.Although apoplast-associated ROS productionby plasma membrane NADPHoxidases have been most thoroughlystudied, recent observations suggest thatROS are generated in chloroplasts earlierin the response and play a key role in executionof LCD. A model is presented inwhich the initial outcome of successfulpathogen detection is ROS accumulationin plastids, likely mediated by mitogenactivatedprotein kinases and causedby dysfunction of the photosyntheticelectron transport chain. ROS signalingis proposed to spread from plastidsto the apoplast, through the activationof NADPH oxidases, and from there toadjacent cells, leading to suicidal deathin the region of attempted infection.