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WRKY genes and jasmonic acid (JA) play a crucial role in plants' responses against biotic and abiotic stress. However, the regulating mechanism of WRKY genes on strawberry fruits' resistance against Botrytis cinerea is largely unknown, and few studies have been performed on their effect on the JA-mediated defense mechanism against B. cinerea . This study explored the effect of FaWRKY25 on the JA-mediated strawberry resistance against B. cinerea . Results showed that the JA content decreased significantly as the fruits matured, whereas the FaWRKY25 expression rose substantially, which led to heightened susceptibility to B. cinerea and in strawberries. External JA treatment significantly increased the JA content in strawberries and reduced the FaWRKY25 expression, thereby enhancing the fruits' resistance against B. cinerea . FaWRKY25 overexpression significantly lowered the fruits' resistance against B. cinerea , whereas FaWRKY25 silencing significantly increased resistance. Moreover, FaWRKY25 overexpression significantly lowered the JA content, whereas FaWRKY25 silencing significantly increased it. FaWRKY25 expression level substantially affects the expression levels of genes related to JA biosynthesis and metabolism, other members of the WRKY family, and defense genes. Accordingly, FaWRKY25 plays a crucial role in regulating strawberries' resistance against B. cinerea and may negatively regulate their JA-mediated resistance mechanism against B. cinerea .

Strawberry FaWRKY25 Transcription Factor Negatively Regulated the Resistance of Strawberry Fruits to Botrytis cinerea