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Evidence that Beet Necrotic Yellow Vein Virus RNA-4 Is Essential for Efficient Transmission by the Fungus Polymyxa betae

Hokkaido Central Agricultural Experiment Station, Naganuma, Hokkaido 069-13, Japan

The efficiency of transmission by Polymyxa betae of beet necrotic yellow vein virus (BNYVV) isolates containing different RNA components was compared using sugar-beet seedlings as test plants. Isolate S-4, containing RNA-1 + 2 + 4, was transmitted by P. betae about 100 times more efficiently than isolate S-3 (RNA-1 + 2 + 3) and about 1000 times more efficiently than isolate S-0 (RNA-1 + 2). Isolate S-34 (RNA-1 + 2 + 3 + 4) was transmitted even more efficiently than isolate S-4. Each isolate retained its characteristic RNA composition after transmission by P. betae. The virus content, measured by ELISA, of infected rootlets was S-34 > S-3 > S-4 > S-0. In inoculated leaves of Tetragonia expansa and Beta macrocarpa, isolates S-3 and S-34 multiplied more extensively than did S-4 and S-0. The inefficient transmission of isolate S-3 by P. betae, as compared with S-4, cannot be attributed to a poorer ability to spread in root tissue, but the difference in transmissibility of S-3 and S-0 may be explained in this way. These results show that RNA-4 of BNYVV is essential for efficient transmission by P. betae, and suggest that RNA-3 may influence the ability of the virus to spread in root tissue. RNA-4 and RNA-3 therefore seem to play important, but different, roles in virus survival and spread in nature.

Keywords: BNYVV, RNA species, fungus transmission

Received 28 April 1989; accepted 8 September 1989.

This article has been cited by other articles:

				M. D. Rahim, I. B. Andika, C. Han, H. Kondo, and T. Tamada RNA4-encoded p31 of beet necrotic yellow vein virus is involved in efficient vector transmission, symptom severity and silencing suppression in roots J. Gen. Virol., May 1, 2007; 88(5): 1611 - 1619. [Abstract] [Full Text] [PDF]