Elsevier

Virology

Volume 46, Issue 2, November 1971, Pages 256-265
Virology

Effect in different plant species of continuous light and dark treatment on tobacco mosaic virus replicating capacity

https://doi.org/10.1016/0042-6822(71)90028-6Get rights and content

Abstract

Excised tissue of mottling hosts of tobacco mosaic virus (TMV), Physalis floridana, and Samsun tobacco, and necrotic local lesion hosts, Datura stramonium, Nicotiana glutinosa, and Xanthi tobacco had higher virus replicating capacity (VRC) when cultured in continuous light. On the other hand, the starch lesion host, cucumber, and the subliminally infected host, cotton, had greater VRC when cultured in continuous dark. The dark effect in cotton is cumulative. Protein analysis of tissues indicated in protein following excision a general decline which was more rapid in the dark than in the light. Increase in RNA was found in cotton and cucumber in continuous light. Cotton had low peroxidase and ribonuclease (RNase) activity, even though higher RNase activity was recorded in continuous dark treatment for both healthy and infected tissues. These results suggest that VRC may be controlled by an inhibitory mechanism existing in resistant plant species, such as cotton and cucumber, and that this inhibitory mechanism declines or becomes depleted in darkness, affording more virus production in these hosts.

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