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Anionic peroxidase‐mediated oxidative burst requirement for jasmonic acid‐dependent Solanum tuberosum defence against Phytophthora infestans

Plants are subject to pervasive attack by diverse attackers, such as pathogens and herbivores. It is considered that salicylic (SA) and jasmonic (JA) acids induce systemic resistance to these attackers. Different lines of evidence indicate that SA and JA interplay with reactive oxygen species (ROS) generated by NADPH oxidases or apoplastic peroxidases has an important role in the plant defense response. As it was shown previously, diminished expression of gene M21334, which encodes Solanum tuberosum L. anionic peroxidase as a consequence of anti-sense expression, results in high susceptibility to Phytophthora infestans (Mont) de Bary and deficient lignin deposition in cell walls (asAPO plants). 
 
Further research reported in this paper, shows that asAPO antisense plants have a low level of H2O2 and impaired JA-associated responses, such as transcription of JA-responsive genes and genes of JA-biosynthesis. The asAPO plants do not exhibit any apparent defect in their susceptibility to SA. Exogenous H2O2 partially restores JA-dependent reactions in asAPO plants and, moreover, lignin deposition around pathogen-penetrated sites, that results in increase of asAPO resistance to P. infestans. These data demonstrate that the anionic peroxidase-dependent oxidative burst plays an important role in the elicitation of JA-associated immunity. 
 
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