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However, the pathogenic mechanisms underlying jujube witches'\u2010broom (JWB) disease remain largely unknown. In this study, we identified SJP8 as a key secreted effector protein of \u2018\n                    <jats:italic>Ca<\/jats:italic>\n                    . P. ziziphi\u2019. Overexpression of\n                    <jats:italic>SJP8<\/jats:italic>\n                    in jujube recapitulated the characteristic JWB\u2010like symptoms, including dwarfism and leaf chlorosis. Transcriptome analysis revealed that SJP8 suppressed host immunity by downregulating jasmonic acid (JA)\u2010related genes and upregulating hydrogen peroxide (H\n                    <jats:sub>2<\/jats:sub>\n                    O\n                    <jats:sub>2<\/jats:sub>\n                    )\u2010related genes. SJP8 interacts with ZjMYB15 and ZjMYB86\u2010like and promotes their degradation via the 26S proteasome pathway. Genetic transformation experiments demonstrated that ZjMYB15 and ZjMYB86\u2010like positively regulate plant height and the expression of JA\u2010related genes while repressing H\n                    <jats:sub>2<\/jats:sub>\n                    O\n                    <jats:sub>2<\/jats:sub>\n                    \u2010associated genes. ZjMYB15 and ZjMYB86\u2010like bind to their cognate motifs to activate\n                    <jats:italic>ZjJAIPHX1<\/jats:italic>\n                    (encoding a\n                    <jats:italic>jasmonate\u2010induced protein homologue isoform X1<\/jats:italic>\n                    ) and\n                    <jats:italic>ZjPOD43<\/jats:italic>\n                    (encoding\n                    <jats:italic>peroxidase 43<\/jats:italic>\n                    ) transcription, thereby increasing JA content and decreasing H\n                    <jats:sub>2<\/jats:sub>\n                    O\n                    <jats:sub>2<\/jats:sub>\n                    levels. Collectively, these results establish that the SJP8\u2010ZjMYB15\/ZjMYB86\u2010like\u2010\n                    <jats:italic>ZjJAIPHX1<\/jats:italic>\n                    \/\n                    <jats:italic>ZjPOD43<\/jats:italic>\n                    module suppresses plant immunity by perturbing JA and H\n                    <jats:sub>2<\/jats:sub>\n                    O\n                    <jats:sub>2<\/jats:sub>\n                    homeostasis, thus both elucidating a phytoplasma effector's virulence strategy and providing molecular targets for breeding resistant jujube.\n                  <\/jats:p>","DOI":"10.1111\/mpp.70315","type":"journal-article","created":{"date-parts":[[2026,7,10]],"date-time":"2026-07-10T08:23:52Z","timestamp":1783671832000},"update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":0,"title":["Phytoplasma Effector\n                    <scp>SJP8<\/scp>\n                    Suppresses Host Immunity by Promoting the Degradation of\n                    <scp>ZjMYB15<\/scp>\n                    and\n                    <scp>ZjMYB86<\/scp>\n                    \u2010like to Perturb Jasmonic Acid and Hydrogen Peroxide Homeostasis in Jujube"],"prefix":"10.1111","volume":"27","author":[{"given":"Ying","family":"Yang","sequence":"first","affiliation":[{"name":"State Key Laboratory of Tree Genetics and Breeding, National Engineering Research Center of Tree Breeding and Ecological Restoration, Key Laboratory of Genetics and Breeding in Forest Trees and Ornamental Plants, Ministry of Education, College of Biological Sciences and Biotechnology Beijing Forestry University  Beijing China"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0001-7968-3120","authenticated-orcid":false,"given":"Haizhen","family":"Nie","sequence":"additional","affiliation":[{"name":"State Key Laboratory of Tree Genetics and Breeding, National Engineering Research Center of Tree 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