Role of Cytokinins in Systemic Acquired-resistance of Tobacco Hypersensitive to Tobacco Mosaic-virus

Balázs, Ervin and Sziráki, István and Király, Zoltán (1977) Role of Cytokinins in Systemic Acquired-resistance of Tobacco Hypersensitive to Tobacco Mosaic-virus. PHYSIOLOGICAL PLANT PATHOLOGY, 11 (1). pp. 29-37.

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Abstract

Cytokinin content increased in Xanthi tobacco leaves systemically resistant to challenge inoculation by tobacco mosaic virus (TMV). Subsequently, root formation was strongly suppressed and shoot formation was promoted in leaf cultures derived from resistant leaves. All of these events coincided with the time of development of systemic acquired resistance, i.e. 8 days after the primary inoculation of the lower leaves. In spite of a reduction in the number of visible local lesions in resistant upper leaves, infectivity of ultracentrifuged TMV did not change markedly. Following a I day treatment at.high temperature (32 °C), when necrotization is inhibited and TMV becomes syste.mic, this type of resistance was not manifested. I t is suggested that only the necrotization is suppressed in challenge-inoculated resistant leaves, and the production of the virus is not reduced. Chloramphenicol and ethrel, which promote local lesion production, were counteracted in leaves in which systemic acquired resistance had been induced.

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