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Various host responses are activated upon <jats:italic>Xcc<\/jats:italic> attack; however, their roles in black rot resistance remain ambiguous. In this study, a highly black rot resistance of host plants was achieved by applying a field\u2010screened systemic resistance\u2010eliciting <jats:italic>Bacillus velezensis<\/jats:italic> strain 37\u20101. The contributions of strain 37\u20101\u2010altered host responses to <jats:italic>Xcc<\/jats:italic> resistance were then investigated in <jats:italic>Arabidopsis<\/jats:italic>. Hypersensitive response and hydrogen peroxide accumulation were demonstrated beneficial for <jats:italic>Xcc<\/jats:italic> infection by using <jats:italic>nrg1<\/jats:italic> and <jats:italic>rbohd<\/jats:italic> mutants, histochemical staining against host cell death and reactive oxygen species, detection of antioxidant enzyme activity and RT\u2010qPCR assay. By contrast, salicylic acid was proven essential for black rot suppression by using <jats:italic>NahG<\/jats:italic> transformant, mutants impaired in defence hormone synthesis and signalling pathway, and RT\u2010qPCR assay. Additionally, both isochorismate synthase and phenylalanine ammonia\u2010lyase pathways for salicylic acid biosynthesis were found to be involved in resistance to <jats:italic>Xcc<\/jats:italic>. These findings improve the knowledge of host defence responses crucial for fighting off hemibiotrophic <jats:italic>Xcc<\/jats:italic>.<\/jats:p>","DOI":"10.1111\/pce.15423","type":"journal-article","created":{"date-parts":[[2025,2,13]],"date-time":"2025-02-13T09:54:10Z","timestamp":1739440450000},"page":"4286-4300","update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":4,"title":["Salicylic Acid, Hypersensitive Response and RBOHD\u2010Mediated Hydrogen Peroxide Accumulation Play Key Roles in Black Rot Resistance of Crucifers"],"prefix":"10.1111","volume":"48","author":[{"ORCID":"https:\/\/orcid.org\/0000-0002-8614-1095","authenticated-orcid":false,"given":"Chia\u2010Hua","family":"Lin","sequence":"first","affiliation":[{"name":"Department of Plant Pathology and Microbiology National Taiwan University Taipei Taiwan Republic of 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