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MeJA treatment induced the <jats:italic>Arginase 2<\/jats:italic> (<jats:italic>SlARG2<\/jats:italic>) expression, which is one of the most important encoding genes of arginase. In addition, the treatment with MeJA induced resistance to pathogenic infection in many plants. However, the functions of <jats:italic>SlARG2<\/jats:italic> in MeJA\u2010induced defense to <jats:italic>Botrytis cinerea<\/jats:italic> are unclear. In our work, control and <jats:italic>SlARG2<\/jats:italic>\u2010silenced tomato fruits (<jats:italic>Solanum lycopersicum<\/jats:italic>) were treated with 0.05\u2009mmoL\u2009L<jats:sup>\u22121<\/jats:sup> MeJA before storage to assay the roles of <jats:italic>SlARG2<\/jats:italic> in MeJA\u2010induced defense responses to <jats:italic>Botrytis cinerea.<\/jats:italic><\/jats:p><\/jats:sec><jats:sec><jats:title>RESULTS<\/jats:title><jats:p>Our results indicated that MeJA treatment induced both pathogenesis\u2010related gene expression (<jats:italic>PR1<\/jats:italic>, <jats:italic>PR2a<\/jats:italic>, <jats:italic>PR2b<\/jats:italic> and <jats:italic>PR3b<\/jats:italic>), and the activity of defense\u2010related enzymes, as well as upregulated arginine metabolism. Compared to control fruits, the treatment with MeJA also induced the activity of arginase, arginine decarboxylase (ADC) and ornithine aminotransferase (OAT), and expression of <jats:italic>SlARG2<\/jats:italic>, <jats:italic>SlADC<\/jats:italic>, <jats:italic>ornithine decarboxylase<\/jats:italic> (<jats:italic>SlODC<\/jats:italic>) and <jats:italic>SlOAT<\/jats:italic>, and consequently increased the accumulation of arginine, proline, glutamate, putrescine and spermine. However, the induction effects by MeJA were significantly reduced in fruits in which <jats:italic>SlARG2<\/jats:italic> was silenced and severe disease symptoms were observed.<\/jats:p><\/jats:sec><jats:sec><jats:title>CONCLUSION<\/jats:title><jats:p>MeJA fumigation could inhibit disease development by inducing pathogenesis\u2010related gene expression (<jats:italic>PR1<\/jats:italic>, <jats:italic>PR2a<\/jats:italic>, <jats:italic>PR2b<\/jats:italic> and <jats:italic>PR3b<\/jats:italic>) and defense\u2010related enzymes activity, as well as upregulated arginine metabolism. In addition, <jats:italic>SlARG2<\/jats:italic> silencing could inhibit the functions of MeJA in inducing the accumulation of the above substances. Overall, our study provided strong evidence that <jats:italic>SlARG2<\/jats:italic> was essential for MeJA\u2010induced tomato fruit defense responses to <jats:italic>Botrytis cinerea<\/jats:italic>. \u00a9 2020 Society of Chemical Industry<\/jats:p><\/jats:sec>","DOI":"10.1002\/ps.5888","type":"journal-article","created":{"date-parts":[[2020,5,8]],"date-time":"2020-05-08T12:06:33Z","timestamp":1588939593000},"page":"3292-3301","update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":21,"title":["<scp><i>SlARG2<\/i><\/scp> contributes to <scp>MeJA<\/scp>\u2010induced defense responses to <i>Botrytis cinerea<\/i> in tomato fruit"],"prefix":"10.1002","volume":"76","author":[{"given":"Dedong","family":"Min","sequence":"first","affiliation":[{"name":"School of Agricultural Engineering and Food Science Shandong University of Technology  Zibo PR 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