However, their expression was subsequently decreased at 96 hpi in fengycin + S. Additionally, the transcriptional regulation of defense-related genes GST, SOD, PAL, HMGR, and MPK3 showed the highest upsurge in expression at 48 h post-inoculation (hpi). sclerotiorum only in a greenhouse experiment. Furthermore, the lesion size was dramatically reduced in fengycin-treated tomato plants compared to plants infected with S. sclerotiorum mycelium and downregulated the expression of ROS-scavenging genes viz., superoxide dismutase ( SsSOD1), peroxidase ( SsPO), and catalase ( SsCAT1) compared to the untreated control. Moreover, fengycin induced the accumulation of reactive oxygen species (ROS) in S. Scanning electron microscopy (SEM) and transmission electron microscopy (TEM) revealed structural deformities in the fungal mycelium. Fengycin derived from an AK1S mutant was purified and identified through HPLC and MALDI-TOF-MS, respectively. Bacillus amyloliquefaciens FZB42, its mutant AK1S, and their corresponding metabolites showed in vitro inhibition of S. ![]() ![]() This study aimed to explore the potential of purified fengycin to induce systemic resistance in tomato against Sclerotinia sclerotiorum. ![]() Lipopeptides from Bacillus species exhibit promising biological control activity against plant pathogens.
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