Isolation and Characterization of New Phenazine Metabolites with Antifungal Activity against Root-Rot Pathogens of Panax notoginseng from Streptomyces
2019
Chen, Xiao | Hu, Lin-Fang | Huang, Xue-Shi | Zhao, Li-Xing | Miao, Cui-Ping | Chen, You-Wei | Xu, Li-Hua | Han, Li | Li, Yi-Qing
Three new phenazine metabolites, strepphenazine A–C (1–3), along with a known compound baraphenazine E 4 were isolated from the culture broth of a Streptomyces strain YIM PH20095. The structures were elucidated based on the spectral data. Compounds 1–4 showed different antifungal activity against Fusarium oxysporum, Plectosphaerella cucumerina, Alternaria panax, and Phoma herbarum, which caused root-rot disease of Panax notoginseng with minimal inhibitory concentrations (MICs) of 16–64 μg/mL; compared with compound 4, compounds 1–3 showed better antifungal activity against some of these pathogenic fungi with MICs of 16–32 μg/mL, while compound 4 showed antifungal activity against F. oxysporum, P. cucumerina, and A. panax with the same MICs of 64 μg/mL. Thus, strain YIM PH20095 provides new sources for the development of biological control agents to prevent the infection of pathogenic fungi of P. notoginseng.
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