The effect of infection by TMV on cytokinin level of tobacco plants, and cytokinins in TMV-RNA.

Sziráki, István and Balázs, Ervin (1977) The effect of infection by TMV on cytokinin level of tobacco plants, and cytokinins in TMV-RNA. In: Current Topics in Plant Pathology. Akadémiai Kiadó, Budapest, pp. 345-352. ISBN 9630511711

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Abstract

The effect of virus infection on the cytokinin metabolism of host plants was investigated. Cytokinin activity was determined by applying the soybean callus bioassay. The results show, that the cytokinin activity in extracts prepared from leaves and stems of systemically infected tobacco plants (N. tabacum L. cv. Samsun) was much greater than that in extracts prepared from healthy plants. In addition, cytokinin extracts were prepared from dark green and light green areas of systemically infected tobacco leaves, as well as from infected and healthy half-leaves of a local lesion host (N. tabacum L. cv. Xanthi-nc.). The extract of dark green areas had higher cytokinin activity than that of the extract of light green areas, and the infected Xanthi-nc half-leaves showed increased cytokinin activity compared with healthy half-leaves. In order to study the reason for the increased cytokinin level in virus infected tissues, the possible presence of cytokinins in TMV itself was investigated. Our results show that hydrolysed TMV-RNA had some components with cytokinin activity, even if incorporated into the medium of soybean callus tissue culture without autoclaving. Although the cytokinins in TMV-RNA can not be responsible for the high cytokinin content of infected tissues, they can act as "triggers" in initiating metabolic and morphogenetic changes in virus infected plants.

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