<i>Pp</i>NLP nlp20 orthologous peptides from bacterial, oomycete and fungal organisms exhibit comparable immunogenic activities in <i>Arabidopsis</i>.

Synthetic peptides corresponding to nlp20 (PpNLP) orthologous sequences from another oomycete, Pythium aphanidermatum (nlp20 (PyaNLP)), from fungi Fusarium oxysporum (nlp20 (FoNLP)) and Botrytis cinerea (nlp20 (BcNLP)), and bacterial species Bacillus halodurans (nlp20 (BhNLP)) and Bacillus subtilis (nlp20 (BsNLP)) were tested for their abilities to trigger ethylene formation (EC50 values), MAPK activation, production of reactive oxygen species (oxidative burst), PR1::GUS expression, deposition of callose and seedling growth inhibition. +, activation; −, no activation. PpNLP nlp20 orthologous peptides from bacterial, oomycete and fungal organisms exhibit comparable immunogenic activities in Arabidopsis.