FIGURE 6.

A functional link between peroxynitrite and potato immunity in response to avr P. infestans: the early ONOO^- generation facilitates nitrative modification of nucleic acids that could contribute to the post-transcriptional regulation of gene expression unlocking programmed cell death during HR; the second burst of ONOO^- could favor protease inactivation via protein nitration suppressing the potential executer function of subtilisin-like proteases in cells distal from the zone of active dying cells.