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Los intermediarios reactivos de oxígeno median una red de señales sistémicas en el establecimiento de la inmunidad
M E Alvarez1, R I Pennell, P J Meijer
1Plant Biology Laboratory, The Salk Institute, La Jolla, California 92037, USA.
Cell
|April 7, 1998
Resumen
Los intermediarios reactivos de oxígeno (ROI) desencadenan las defensas locales de las plantas y la inmunidad sistémica. Este estudio revela que las IRO median la señalización reiterativa tanto para la resistencia local como para la sistémica contra los patógenos.
Área de la Ciencia:
- Patología vegetal patología vegetal.
- Biología molecular La biología molecular.
- Inmunología Inmunología.
Sus antecedentes:
- Las respuestas inmunes de las plantas implican explosiones oxidativas de intermediarios reactivos de oxígeno (ROI).
- La respuesta hipersensible localizada (HR) confiere resistencia a los patógenos.
- La resistencia sistémica adquirida (SAR) proporciona inmunidad de amplio espectro.
Objetivo del estudio:
- Investigar el papel de las IRO en la inmunidad sistémica.
- Para determinar si los ROIs median la señalización más allá del sitio de infección inicial.
Principales métodos:
- Inoculación de la Arabidopsis con jeringas de Pseudomonas avirulentas.
- Monitoreo de las explosiones oxidativas y las respuestas micro-hipersensibles (micro-HRs).
Principales resultados:
- La inoculación de patógenos virulentos indujo explosiones oxidativas secundarias en tejidos distantes de Arabidopsis.
- Estos estallidos secundarios llevaron a micro-HRs sistémicos.
- Tanto los estallidos de ROI primarios como secundarios fueron esenciales para desarrollar inmunidad sistémica.
Conclusiones:
- Los IRO actúan como moléculas de señalización cruciales en la defensa de las plantas.
- Una red de señalización de ROI reiterativa subyace a la resistencia local y sistémica de las plantas.
- Este mecanismo mejora la inmunidad de las plantas contra los patógenos.
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