NDLI: RNA 3 deletion mutants of beet necrotic yellow vein virus do not cause rhizomania disease in sugar beets.

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RNA 3 deletion mutants of beet necrotic yellow vein virus do not cause rhizomania disease in sugar beets.

Content Provider	World Health Organization (WHO)-Global Index Medicus
Author	Tamada, T. Uchino, H. Kusume, T. Saito, M.
Abstract	ABSTRACT Two mutant strains of beet necrotic yellow vein virus (BNYVV) containing deletions in RNA 3 were obtained by single lesion transfers in Tetragonia expansa. The deleted regions encode either 94 or 121 amino acids toward the C-terminal part of the 25-kDa protein (P25). Wild-type and mutant virus strains were inoculated by Polymyxa betae to sugar beet seedlings of susceptible and partially resistant cultivars. No differences were found in virus content in rootlets between mutant and wild-type viruses or between susceptible and resistant cultivars after culture for 4 weeks in a growth cabinet. However, when virus-inoculated seedlings were grown in the field for 5 months, the wild-type virus caused typical rhizomania root symptoms (69 to 96% yield loss) in susceptible cultivars, but no symptoms (23% loss) developed in most plants of the resistant cultivar, and BNYVV concentrations in the roots were 10 to 20x lower in these plants than in susceptible plants. In contrast, the mutant strains caused no symptoms in susceptible or resistant cultivars, and the virus content of roots was much lower in both cultivars than in wild-type virus infections. Wild-type RNA 3 was not detectable in most of the taproots of a resistant cultivar without any symptoms, suggesting that replication of undeleted RNA 3 was inhibited. These results indicate that the P25 of BNYVV RNA 3 is essential for the development of rhizomania symptoms in susceptible cultivars and suggest that it may fail to facilitate virus translocation from rootlets to taproots in the partially resistant cultivar.
File Format	HTM / HTML
ISSN	0031949X
e-ISSN	19437684
Journal	Phytopathology
Issue Number	11
Volume Number	89
Language	English
Publisher	The American Phytopathological Society
Publisher Date	1999-11-01
Publisher Place	United States
Access Restriction	Open
Subject Keyword	Plant Disease Plant Pathology
Content Type	Text
Resource Type	Article
Subject	Plant Science Agronomy and Crop Science

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