Properties of cucumber green mottle mosaic virus isolated from water of river Jamuna
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Authors
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S. VANI and A. VARMA
Advanced Centre of Plant Virology, Division of Mycology and Plant Pathology, Indian Agricultural Research Institute, New Delhi 110 012
Keywords:
Cucumber green mottle mosaic virus, muskmelon, water transmission, tobamovirusAbstract
Cucumber green mottle mosaic virus (CGMMV) was isolated from the water of Jamuna river and also from the irrigation water used in experimental farm of the Indian Agricultural Research Institute, New Delhi. In Jamuna river, CGMMV was consistently found between February and July whereas in the irrigation water the virus was found during April to June. No virus was, however, found in the subsoil water collected from the Jamuna bed. Host range of the virus isolated from irrigation water was restricted to family Cucurbitaceae and Chenopodium amaranticolor which developed chlorotic local lesions. Thermal inactivation point of the virus was between 85° and 95°C and dilution end point in extracts of cucumber was between 10-5 and 1O..{i.The virus remained infective in plant extracts for more than four months. Particles of the virus were 300 x 15 nm. The virus was serologically closely related to the muskmelon isolate of CGMMV and distantly to frangipani mosaic and tobacco mosaic viruses. Incidence of CGMMV was high (60-80%) in muskmelon and watermelon near the old bridge of Jamuna in Delhi where the river was highly contaminated with plant debris. Five kilometres upstream, the river water was clean and free from plant debris and the area had less (30-40%) incidence of the virus. These findings indicate a positive role of irrigation water in the spread of CGMMV under natural conditions.
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