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RE: N-Hydroxypipecolic Acid: A Novel Metabolite of Lysine Controlling Systemic Acquired Resistance in Plants
Thank you. The role of small molecules in regulating key processes in plants, such as defence against pathogens, is fascinating.
Are there any known examples of plant pathogens that have found a way to bypass salicylic acid-mediated defense?
Yes, these are described by Qi et al. (2018) cited in the References section. One example would be the citrus pathogen Candidatus Liberibacter asiaticus that produces an enzyme that degrades salicylic acid:
Li, J., Pang, Z., Trivedi, P., Zhou, X., Ying, X., Jia, H., Wang, N. 'Candidatus Liberibacter asiaticus' Encodes a Functional Salicylic Acid (SA) Hydroxylase That Degrades SA to Suppress Plant Defenses. Mol. Plant Microbe Interact. 30: 620-630 (2017)