Cross-Protection and Multiplication of Mild and Severe Strains of TMV in Tomato Plants |
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| Authors: | J Burgyán R Gáborjányi |
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| Institution: | Plant Protection Institute, Hungarian Academy of Sciences, Budapest, Hungary |
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| Abstract: | The presence of virus having mixed coats has been demonstrated serologically in tomato plants cross-protected with a mild strain (M 11–16) against the severe (UI) strain of tobacco mosaic virus (TMV). The proportion of virus having mixed coats remained constant throughout at ca. 40% even in top leaves where severe symptoms caused by the challenge virus (U1) first appeared. The symptoms caused by the U1 in doubly-inoculated plants occurred in the leaves where: - (a) the amout of total virus (irrespective of the type of coat) protein was 52% that of U1 strain in singly inoculated plants,
- (b) the multiplication of the severe U1 strain was reduced to only 9% as compared with the leaves singly inoculated with U1,
- (c) the ratio of severe to mild strain was increased to near equality although there was a significant reduction in the multiplication of U1in these leaves,
- (d) the amount of infective U1RNA started to increase.
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