Biocontrol activity of an endophytic Streptomyces sp. strain MBCN152-1 and its mode of action

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By scanning electron microscopy, it was revealed that Streptomyces sp. strain MBCN152-1 colonized cuticle surface and intercellular spaces of cabbage cotyledons. Light and fluorescent microscopic observation indicated that MBCN152-1 could discern A. brassicicola from other fungi, and parasitize hyphal cell wall of A. brassicicola. However, interestingly, MBCN152-1 exhibited intensive biocontrol effect against non-host pathogen Glomerella cingulata, causal agent of strawberry anthracnose. When cabbage seedlings colonized by MBCN152-1 were inoculated with A. brassicicola, infection by the pathogen was significantly suppressed, though formation of physical barrier such as papillae was not observed in the cells which were penetrated by infection hyphae of the pathogen. These results suggested that mycoparasitism and induction of systemic resistance without formation of physical barrier in the host plant cells were involved in the mechanisms of biocontrol by strain MBCN152-1.