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Cucumber mosaic virus associated rna 5 1. comparison of the aptitude to induce tomato necrosis of satellite rna isolated from various cmv strains

Cucumber mosaic virus associated rna 5 1. comparison of the aptitude to induce tomato necrosis of satellite rna isolated from various cmv strains

Agronomie 1(10): 927-932

ISSN/ISBN: 0249-5627

Tomato plants when infected with cucumber mosaic virus may develop mosaic and fern leaf symptoms or lethal necrosis. The necrotic syndrome is associated with the presence of RNA-5 (CMV-satellite) in the nucleoproteins. When added to different viral genomes (I17F, K, M) inducing fern leaf symptoms, RNA-5 of various strains (I17N, D, TL, S) provokes the development of typical necrosis on infected tomato plants. A particular CMV strain (R strain) cannot induce the necrosis, although great amount of RNA-5 is synthesized on tomato. The inoculation of the genomes I17F, K or M with CMV-R satellite RNA results in an important decrease of the symptoms of mosaic and fern leaf caused by the infection with the genome alone. These results suggest 2 types of satellite RNAs differing by their capacity to induce the tomato necrosis. When they are present together in the inoculum, the plants essentially develop necrosis if the concentration of the necrogen satellite RNA is important enough to induce necrosis in all the tomato plants where it has been inoculated with the genome RNAs. In other cases, it seems that the 2 satellite RNAs may interfere.

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Accession: 005073347

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