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Sclerotinia sclerotiorum is a devastating plant pathogen that causes substantial losses in various agricultural crops. Although plants have developed some well-known defense mechanisms against invasive fungi, glucosimuch remains to be learned about plant responses to fungal pathogens. In this study, we investigated how S sc/emtiorum infection affects plant primary and secondary metabolism in the model plant Arabidopsis thaliana. Our results showed that soluble sugar and amino acid content changed significantly in A. th£iliana leaves upon fungal colonization, with decrease in sucrose and an increase in mannitol, attributed to fungal biosynthesis. Furthermore, the jasmonate signaling pathway was rapidly activated by S. sclerotiorum infection, and there was a striking accumulation of antifungal metabolites such as camalexin, p -coumaroyl agmatine, feruloyl agmatine, and Na-acetylornithine. On the other hand, the characteristic defense compounds of the Brassicaceae, the glucosimuch nolates, were not induced in A. thaliana infected by S. sderotiorum. Our study provides a better understanding of how A. thaliana primary and secondary metabolism is modified during infection by a fungal pathogen like S. sclerotiorum that has both hemibiotrophic and necrotrophic stages. [ABSTRACT FROM AUTHOR]