Identification of Antagonistic Streptomyces sp. AX-1 and Its Control Efficacy Against Sour Rot of Nectarine

Key Points

• To determine the classification and control efficacy of Streptomyces sp. AX-1 against sour rot of nectarines caused by Geotrichum candidum.
• Morphological and biochemical characteristics analysis for identification.
• Co-culture method to determine antifungal activity.
• Observation of mycelium and spores using microscopy.
• In vitro experiments to test different concentrations of fermentation filtrate.
• Measurement of inhibitory effects on pathogen growth and disease progression.
• AX-1 was identified as Streptomyces albidoflavus with a 67.08% inhibition rate in co-culture.
• Filtrate showed a concentration-dependent antifungal effect; 10-fold dilution achieved 67.24% inhibition.
• The filtrate caused abnormal swelling of pathogen mycelium and reduced spore germination to 17.33%.
• In vitro tests indicated a significant reduction in lesion size with the 10-fold diluted filtrate after 5 days.

Abstract