Abstract
Interference between tobacco mosaic virus (TMV) and a strain of cucumber mosaic virus, causing local lesions on Zinnia elegans, (CMV-LL), is described. Interference was observed on Nicotiana repanda and N. glutinosa when CMV-LL functioned as protecting virus, as well as on Z. elegans when the protecting virus was TMV. Simultaneous inoculations of N. repanda or N. glutinosa with the two viruses prevented the establishment or the multiplication of CMV-LL. Increasing concentrations of TMV in the challenge inocula resulted in an increased percentage of protection. This supports the hypothesis that the protecting virus occupies some cellular structures or exhausts some precursors needed for the establishment or multiplication of the challenge virus. No interference was observed among the common strains of cucumber mosaic virus, potato virus X, potato virus Y, and TMV.
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