Signal interactions between nitric oxide and reactive oxygen intermediates in the plant hypersensitive disease resistance response

Proceedings of the National Academy of Sciences of the United States of America
M DelledonneC Lamb

Abstract

Nitric oxide (NO) and reactive oxygen intermediates (ROIs) play key roles in the activation of disease resistance mechanisms both in animals and plants. In animals NO cooperates with ROIs to kill tumor cells and for macrophage killing of bacteria. Such cytotoxic events occur because unregulated NO levels drive a diffusion-limited reaction with O(2)(-) to generate peroxynitrite (ONOO(-)), a mediator of cellular injury in many biological systems. Here we show that in soybean cells unregulated NO production at the onset of a pathogen-induced hypersensitive response (HR) is not sufficient to activate hypersensitive cell death. The HR is triggered only by balanced production of NO and ROIs. Moreover, hypersensitive cell death is activated after interaction of NO not with O(2)- but with H(2)O(2) generated from O(2)(-) by superoxide dismutase. Increasing the level of O(2)(-) reduces NO-mediated toxicity, and ONOO(-) is not a mediator of hypersensitive cell death. During the HR, superoxide dismutase accelerates O(2)(-) dismutation to H(2)O(2) to minimize the loss of NO by reaction with O(2)(-) and to trigger hypersensitive cell death through NO/H(2)O(2) cooperation. However, O(2)(-) rather than H(2)O(2) is the primary ROI signal for pa...Continue Reading

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