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The majority of studies show that chemical disruption of the actin cytoskeleton increases plant susceptibility to pathogen infection. Similarly, several pathogens have adopted this as a virulence strategy and produce effectors that affect cytoskeleton integrity. Such effectors either exhibit actin\u2010depolymerizing activity themselves or prevent actin polymerization. Is it thus possible for plants to recognize the actin's status and launch a counterattack? Recently we showed that chemical depolymerization of actin filaments can trigger resistance to further infection via the specific activation of salicylic acid (SA) signalling. This is accompanied by several defence\u2010related, but SA\u2010independent, effects (e.g. callose deposition, gene expression), relying on vesicular trafficking and phospholipid metabolism. These data suggest that the role of actin in plant\u2013pathogen interactions is more complex than previously believed. It raises the question of whether plants have evolved a mechanism of sensing pathological actin disruption that eventually triggers defence responses. If so, what is the molecular basis of it? Otherwise, why does actin depolymerization specifically influence SA content but not any other phytohormone? Here we propose an updated model of actin's role in plant\u2013microbe interactions and suggest some future directions of research to be conducted in this area.<\/jats:p>","DOI":"10.1111\/nph.16584","type":"journal-article","created":{"date-parts":[[2020,4,7]],"date-time":"2020-04-07T19:31:20Z","timestamp":1586287880000},"page":"1605-1609","update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":23,"title":["Disrupted actin: a novel player in pathogen attack sensing?"],"prefix":"10.1111","volume":"227","author":[{"ORCID":"https:\/\/orcid.org\/0000-0002-7625-0204","authenticated-orcid":false,"given":"Hana","family":"Leontovy\u010dov\u00e1","sequence":"first","affiliation":[{"name":"Laboratory of Pathological Plant Physiology Institute of Experimental Botany The Czech Academy of Sciences Rozvojova 263 165 02 Prague 6 Czech Republic"},{"name":"Laboratory of Plant Biochemistry Department of Biochemistry and Microbiology University of Chemistry and Technology Prague Technicka 5 166 28 Prague 6 Czech Republic"},{"name":"Department of Biochemistry Faculty of Science Faculty of Science Charles University in Prague Hlavova 2030\/8 128 44 Prague 2 Czech Republic"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-2843-5482","authenticated-orcid":false,"given":"Tetiana","family":"Kalachova","sequence":"additional","affiliation":[{"name":"Laboratory of Pathological Plant Physiology Institute of Experimental Botany The Czech Academy of Sciences Rozvojova 263 165 02 Prague 6 Czech Republic"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-4521-0533","authenticated-orcid":false,"given":"Martin","family":"Janda","sequence":"additional","affiliation":[{"name":"Laboratory of Pathological Plant Physiology Institute of Experimental Botany The Czech Academy of Sciences Rozvojova 263 165 02 Prague 6 Czech Republic"},{"name":"Laboratory of Plant 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