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Laura García-Gutiérrez, Houda Zeriouh, Diego Romero, Jaime Cubero, Antonio de Vicente and Alejandro Pérez-García The antagonistic strain Bacillus subtilis UMAF6639 also confers protection to melon plants against cucurbit powdery mildew by activation of jasmonate- and salicylic acid-dependent defence responses Microbial Biotechnology 6

Article first published online: 10 JAN 2013 | DOI: 10.1111/1751-7915.12028

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In the present work we investigated in detail the mechanisms by which the antagonistic strain Bacillus subtilis UMAF6639 is also able to induce systemic resistance in melon and provide protection against powdery mildew. Our results demonstrated that UMAF6639 combats disease by activation of jasmonate- and salicylic acid-dependent defence responses, which include the production of reactive oxygen species and cell wall reinforcement. We also showed that surfactin lipopeptide is a major determinant for stimulation of the plant immune response. These results reinforce the biotechnological potential of UMAF6639 as a biological control agent.

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