Effects of Localized Infections ofNicotiana tabacumby Tobacco Mosaic Virus on Systemic Resistance Against Diverse Pathogens and an Insect

Publisher Website
Google Scholar
Abstract
In experiments that were performed simultaneously, tobacco mosaic virus (TMV) inoculation of a hypersensitive tobacco cultivar induced systemic and long-lived resistance against TMV, Phytophthora parasitica var. nicotianae (Ppn) and Pseudomonas tabaci. In separate experiments, TMV also induced resistance against Peronospora tabacina. Reproduction of the aphid, Myzus persicae, was also reduced on TMV-infected plants. Resistance to Ppn, P. tabaci and TMV was also induced by localized infections of tobacco necrosis virus. Systemic infections by cucumber mosaic virus reduced only the number of lesions caused by TMV. Levels of protection and the time resistance developed in a given leaf were not the same for the different challengers. A single viral agent may induce resistance in tobacco against diverse challengers.