Strain KBPF-004 Culture Supernatants Reduced Seed Transmission of and , and Remodeled Aggregation of 126 kDa and Subcellular Localization of Movement Protein of .

Efforts to control viral diseases in crop production include several types of physical or chemical treatments; antiviral extracts of a number of plants have also been examined to inhibit plant viral infection. However, treatments utilizing naturally selected microorganisms with activity against plant viruses are poorly documented. Here we report isolation of a soil inhabiting bacterium, strain KBPF-004 (developmental code KNF2016) which showed antiviral activity against mechanical transmission of tobamoviruses.

Antifungal activity of valinomycin, a peptide antibiotic produced by Streptomyces sp. Strain M10 antagonistic to Botrytis cinerea.

A strain of Streptomyces sp. (M10) antagonistic to Botrytis cinerea was isolated from orchard soil obtained from Jeju Island, Korea. An antifungal substance (CN1) was purified from the culture extracts of the strain, and then identified as valinomycin through extensive spectroscopic analyses.