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Bean common mosaic virus (BCMV) is one of the most widespread in bean crops viruses belonging to Potyviridae family. The present study was conducted to know the physical properties of BCMV distributed in Ukraine. Methods. Visual diagnosis, biological testing of the virus, electron microscopy, polymerase chain reaction with reverse transcription (RT-PCR). Results. The presence of BCMV in the plants showing clear viral infection symptoms was established by RT-PCR. The virus was purified from BCMV-infected bean tissues by modified procedure involved clearing with 2.5 % of Triton X-100 and concentrating by centrifugation with linear 10-50 % sucrose gradient in 0.1 M Tris-thioglycolic acid. The yield of purified virus was 3-4 mg/100 g of infected leaves. The determination of physical properties using the same buffer showed that infectivity of crude was lost by heating at 60-65° C for 10 minutes, dilution end point (DEP) was 10 4 and longevity in vitro (LIV) was 1-2 days at 4º C or 3-4 days at 20-25° C storage in vitro. This virus is long flexuous filamentous particles approximately 740-750 nm in size. Conclusions. The results added physical properties to the knowledge of BCMV which helps in determining management strategies against the virus.

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This paper reports brief systematization of the current knowledge of the biology of mycoviruses, viral morphology, and genetics in particular as well as characteristics of the virus transmission and infection symptoms in fungal cells. The mechanisms involved in antiviral defense in the members of different classes of fungi are discussed. Insights into the role of hypovirulent mycoviruses in the biotechnological control of phytopathogenic fungi are provided.

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