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Characterization of Closterovirus‐like Particles Associated with Grapevine Leafroll Disease
Author(s) -
Hu J. S.,
Gonsalves D.,
Teliz D.
Publication year - 1990
Publication title -
journal of phytopathology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.53
H-Index - 60
eISSN - 1439-0434
pISSN - 0931-1785
DOI - 10.1111/j.1439-0434.1990.tb04247.x
Subject(s) - closterovirus , biology , polyclonal antibodies , antiserum , virology , serotype , plant virus , ouchterlony double immunodiffusion , serology , monoclonal antibody , virus , microbiology and biotechnology , antibody , immunology
A purification procedure (Z ee et al. 1987) for closterovirus‐like particles associated with grapevine leafroll disease was improved after various sources of plant tissues, extraction buffers, pH values, and centrifugation techniques had been examined. An antiserum against the CA‐4 isolate was produced and used in ELISA. The virus‐like particles of the NY‐1 isolate measured in crude plant preparations were about 1,800 to 1,900 nm long. The molecular weight of coat protein of the NY‐1and NY‐2 isolates were ca. 43 × 10 3 daltons in SDS‐PAGE analysis; and bands having this molecular weight reacted in Western blotting tests with specific polyclonal and monoclonal antibodies. A large dsRNA molecule (ca. 10 × 10 6 Mr) along, with lower molecular weight species were isolated from leafroll diseased grapevines, but not from healthy grapevines. Seven leafroll isolates were tested for their serological relatedness in a protein A‐gold labelling immunosorbent electron microscopy, assay. Results indicated that serologically distinct serotypes existed, and mixed infection of grapevines with different scrotypes was common. A grouping of isolates into serotype I, II, III, IV is proposed.