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Previous studies have shown that CATs exhibit different or even opposite effects on plant immunity in different plant\u2013pathogen interactions, but little is known about the mechanisms. In this study,\n                    <jats:italic>Nicotiana tabacum<\/jats:italic>\n                    plants with overexpression or knockout of CAT genes, tobacco mosaic virus (TMV) and cucumber mosaic virus (CMV) were employed to investigate the role of CAT in compatible plant\u2013virus interactions. The results showed that there were dynamic changes in the effect of CAT on\n                    <jats:italic>N. tabacum<\/jats:italic>\n                    defense responses. Overexpression of catalase 1 (CAT1) and catalase 3 (CAT3) improved\n                    <jats:italic>N. tabacum<\/jats:italic>\n                    resistance in the early stage of virus infection but depressed it during the late stages of pathogenesis, especially in CAT3 overexpressing plants. The lower level of electrolyte leakage, lower contents of malonaldehyde and hydrogen peroxide (H\n                    <jats:sub>2<\/jats:sub>\n                    O\n                    <jats:sub>2<\/jats:sub>\n                    ), higher activities of antioxidant enzymes and improved functions of photosystem II corresponded to the milder symptoms and higher resistance of infected tobacco plants. In addition, the infection of TMV and CMV resulted in expression changes of\n                    <jats:italic>CATs<\/jats:italic>\n                    in tobacco plants, and pretreatment with H\n                    <jats:sub>2<\/jats:sub>\n                    O\n                    <jats:sub>2<\/jats:sub>\n                    facilitated TMV and CMV infection. Further experiments showed that the content of salicylic acid (SA) and the expression of genes related to SA signaling pathway were positively correlated with plant resistance, whereas auxin and its related signaling pathway were related to the viral susceptibility of plants. Taken together, our results demonstrated that CAT1 and CAT3 mediated tobacco resistance to virus infection through crosstalk between SA and auxin signaling pathways.\n                  <\/jats:p>","DOI":"10.1111\/ppl.14012","type":"journal-article","created":{"date-parts":[[2023,9,4]],"date-time":"2023-09-04T03:33:27Z","timestamp":1693798407000},"update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":15,"title":["Catalases mediate tobacco resistance to virus infection through crosstalk between salicylic acid and auxin signaling pathways"],"prefix":"10.1111","volume":"175","author":[{"given":"Wanying","family":"Huang","sequence":"first","affiliation":[{"name":"Key Laboratory of Bio\u2010Resource and Eco\u2010Environment of Ministry of Education, College of Life Sciences Sichuan University  Chengdu Sichuan People's Republic of 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