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Additionally, attacked plants can release aerial or below\u2010ground signals that trigger defense responses, such as SAR, in neighboring plants lacking initial exposure to pathogen or pest elicitors. However, the molecular mechanisms involved in interplant defense signal generation in sender plants and decoding in neighboring plants are not fully understood.<\/jats:p><\/jats:list-item>\n\n<jats:list-item><jats:p>We previously reported that <jats:italic>Pieris brassicae<\/jats:italic> eggs induce intraplant SAR against the foliar pathogen <jats:italic>Pseudomonas syringae<\/jats:italic> in <jats:italic>Arabidopsis thaliana<\/jats:italic>. Here we extend this effect to neighboring plants by discovering an egg\u2010induced interplant SAR via mobile root\u2010derived signal(s).<\/jats:p><\/jats:list-item>\n\n<jats:list-item><jats:p>The generation of an egg\u2010induced interplant SAR signal requires pipecolic acid (Pip) pathway genes <jats:italic>ALD1<\/jats:italic> and <jats:italic>FMO1<\/jats:italic> but occurs independently of salicylic acid (SA) accumulation in sender plants. Furthermore, reception of the signal leads to accumulation of SA in the recipient plants.<\/jats:p><\/jats:list-item>\n\n<jats:list-item><jats:p>In response to insect eggs, plants may induce interplant SAR to prepare for potential pathogen invasion following feeding\u2010induced wounding or to keep neighboring plants healthy for hatching larvae. Our results highlight a previously uncharacterized below\u2010ground plant\u2010to\u2010plant signaling mechanism and reveals genetic components required for its generation.<\/jats:p><\/jats:list-item>\n<\/jats:list>\n<\/jats:p>","DOI":"10.1111\/nph.16788","type":"journal-article","created":{"date-parts":[[2020,7,3]],"date-time":"2020-07-03T18:32:57Z","timestamp":1593801177000},"page":"1652-1661","update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":23,"title":["<i>Pieris brassicae<\/i> eggs trigger interplant systemic acquired resistance against a foliar pathogen in Arabidopsis"],"prefix":"10.1111","volume":"228","author":[{"ORCID":"https:\/\/orcid.org\/0000-0001-8583-9814","authenticated-orcid":false,"given":"Zigmunds","family":"Orlovskis","sequence":"first","affiliation":[{"name":"Department of Plant Molecular Biology University of Lausanne Lausanne 1015 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