Metabolomic profiling of virulent and non-virulent Beauveria bassiana strains: insights into the pathogenicity of Tetranychus truncatus

In this study, the pathogenicity of local Beauveria bassiana strains was elucidated using molecular and metabolomics methodologies. Molecular verification of the B. bassiana -specific chitinase gene was achieved via phylogenetic analysis of the Bbchit1 region. Subsequent metabolomic analyses employing UPLC-Q-TOF-MS revealed a different number of non-volatile metabolite profiles among the six B. bassiana strains. Bb6 produced the most non-volatile compounds (17) out of a total of 18, followed by Bb15 (16) and Bb12 (15). Similarly, Bb5, Bb8, and Bb21, three non-virulent B. bassiana strains, produced 13, 14, and 14 metabolites, respectively. But unique secondary metabolites like bassianolide and beauvericin, pivotal for virulence and mite management, were exclusively found in the virulent strains (Bb6, Bb12, and Bb15) of B. bassiana . The distinctive non-volatile metabolomic profiles of these strains underscore their pathogenicity against Tetranychus truncatus , suggesting their promise in bio-control applications.