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However, the priming response in postharvest fruits has not been elucidated. Here, we found that 50\u00a0mM \u03b2\u2010aminobutyric acid (BABA) treatment could induce two distinct pathways linked with TGA1\u2010related systemic acquired resistance (SAR), resulting in the alleviation of Rhizopus rot in postharvest peach fruit. The first priming phase was elicited by BABA alone, leading to the enhanced transcription of redox\u2010regulated genes and posttranslational modification of PpTGA1. The second phase was activated by an H<jats:sub>2<\/jats:sub>O<jats:sub>2<\/jats:sub> burst via up\u2010regulation of <jats:italic>PpRBOH<\/jats:italic> genes and stimulation of the MAPK cascade on pathogen invasion, resulting in a robust defence. In the MAPK cascade, PpMAPKK5 was identified as a shortcut interacting protein of PpTGA1 and increased the DNA binding activity of PpTGA1 for the activation of salicylic acid (SA)\u2010responsive <jats:italic>PR<\/jats:italic> genes. The overexpression of <jats:italic>PpMAPKK5<\/jats:italic> in <jats:italic>Arabidopsis<\/jats:italic> caused the constitutive transcription of SA\u2010dependent <jats:italic>PR<\/jats:italic> genes and as a result conferred resistance against the fungus <jats:italic>Rhizopus stolonifer<\/jats:italic>. Hence, we suggest that the BABA\u2010induced priming defence in peaches is activated by redox homeostasis with an elicitor\u2010induced reductive signalling and a pathogen\u2010stimulated H<jats:sub>2<\/jats:sub>O<jats:sub>2<\/jats:sub> burst, which is accompanied by the possible phosphorylation of PpTGA1 by PpMAPKK5 for signal amplification.<\/jats:p>","DOI":"10.1111\/mpp.13134","type":"journal-article","created":{"date-parts":[[2021,9,9]],"date-time":"2021-09-09T00:28:46Z","timestamp":1631147326000},"page":"1624-1640","update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":28,"title":["Activation of the BABA\u2010induced priming defence through redox homeostasis and the modules of TGA1 and MAPKK5 in postharvest peach fruit"],"prefix":"10.1111","volume":"22","author":[{"ORCID":"https:\/\/orcid.org\/0000-0002-7133-0301","authenticated-orcid":false,"given":"Chunhong","family":"Li","sequence":"first","affiliation":[{"name":"College of 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