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Here, we studied SA in <jats:italic>Populus tomentosa<\/jats:italic> infected by the plant pathogen <jats:italic>Botryosphaeria dothidea<\/jats:italic>. The accumulation of SA and methyl salicylate (MeSA) occurred in chronological order in <jats:italic>P<\/jats:italic>. <jats:italic>tomentosa<\/jats:italic>. The SA and MeSA contents were greater at infected than uninfected sites. Additionally, a gene expression analysis indicated that SA might be accumulated by phenylalanine ammonialyase (PAL) and converted to MeSA by SA carboxyl methyltransferase (SAMT), while MeSA might convert to SA by SA-binding protein 2 (SABP2). The expressions of <jats:italic>SAMT<\/jats:italic> at infected sites and <jats:italic>SABP2<\/jats:italic> at uninfected sites, respectively, were significantly up-regulated. Thus, SA might be converted to MeSA at infected sites and transported as a signalling molecule to uninfected sites, where it is converted to SA for SAR. Moreover, the expressions of pathogenesis-related genes <jats:italic>PR-1<\/jats:italic>, <jats:italic>PR-2<\/jats:italic> and <jats:italic>PR-5<\/jats:italic> in <jats:italic>P<\/jats:italic>. <jats:italic>tomentosa<\/jats:italic> were up-regulated by the <jats:italic>B<\/jats:italic>. <jats:italic>dothidea<\/jats:italic> infection. Our study determined that variations in SA and MeSA contents occur at infected and uninfected sites in poplar after pathogen infection and contributed to the remote signals for poplar SAR.<\/jats:p>","DOI":"10.1038\/s41598-018-32204-9","type":"journal-article","created":{"date-parts":[[2018,9,13]],"date-time":"2018-09-13T10:51:20Z","timestamp":1536835880000},"update-policy":"https:\/\/doi.org\/10.1007\/springer_crossmark_policy","source":"Crossref","is-referenced-by-count":28,"title":["Salicylic acid in Populus tomentosa is a remote signalling molecule induced by Botryosphaeria dothidea infection"],"prefix":"10.1038","volume":"8","author":[{"given":"Yong-xia","family":"Li","sequence":"first","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Wei","family":"Zhang","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Hui-xia","family":"Dong","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Zhen-yu","family":"Liu","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Jian","family":"Ma","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Xing-yao","family":"Zhang","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"297","published-online":{"date-parts":[[2018,9,19]]},"reference":[{"key":"32204_CR1","doi-asserted-by":"publisher","first-page":"436","DOI":"10.1016\/j.pbi.2008.05.003","volume":"11","author":"AC Vlot","year":"2008","unstructured":"Vlot, A. 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