Received: 03-10-2022 / Accepted: 20-12-2022
Anthracnose caused by Collectotrichumspp is one of the most common postharvest diseases of dragon fruit. In this study, 56 strains of Streptomycesspp. were used to evaluate the antifungal ability agaisnt C. acutatumC1. Preliminary screening results using streak culture method showed that 33 strains had no antifungal activity, 17 strains showed weak effect, and 6 strain had strong resistance. Notably, the strain NARZ showed the strongest inhibition and was identified based on its 16S rRNA gene as Streptomyces murinus. Cell-free supernatant of Strep. murinus prevented the growth of C. acutatumC1 on PDA medium. Concentration of 28.89% had the ability to inhibit at least 50% of the growth of C. acutatumC1. Thus, Strep. murinusNARZ could have potential application in anthracnose control for postharvest dragon fruit.
