Responses of beneficial XXXX SQR9 to different soilborne fungal pathogens through the alteration of antifungal compounds production.

@entity10679 @entity10437 @entity19868 @entity4278 @entity71366 @entity23696
@entity10679 SQR9 exhibited predominantly antagonistic activities against a broad range of soilborne pathogens. The fungi-induced SQR9 extracts possess stronger antifungal activities compared with SQR9 monoculture extracts. To investigate how SQR9 fine-tunes lipopeptides (LPs) and a siderophore bacillibactin production to control different fungal pathogens, LPs and bacillibactin production and transcription of the respective encoding genes in SQR9 were measured and compared with six different soilborne fungal pathogens. SQR9 altered its spectrum of antifungal compounds production responding to different fungal pathogen. @entity71366 was the major LP produced when SQR9 was confronted with @entity4278 . Fengycin contributed to the antagonistic activity against @entity23696 kleb, @entity4278 , @entity10437 , and Phytophthora parasitica. Surfactin participated in the antagonistic process against @entity19868 , Rhizoctonia solani, and @entity10437 . Bacillibactin was up-regulated when SQR9 was confronted with all tested fungi. The reduction in antagonistic activities of three LP and bacillibactin deficient mutants of SQR9 when confronted with the six soilborne fungal pathogens provided further evidence of the contribution of LPs and bacillibactin in controlling fungal pathogens. These results provide a new understanding of specific cues in bacteria-fungi interactions and provide insights for agricultural applications.
