The effects of rootstock and scion on tobacco mosaic virus infection in susceptible, tolerant and immune cultivars of tomato |
| |
Authors: | A. ARROYO I. W. SELMAN |
| |
Affiliation: | Department of Biological Sciences, Wye College, Wye, Ashford, Kent |
| |
Abstract: | Reciprocal grafts were made between tomato cultivars Potentate, susceptible, and Virocross, tolerant (heterozygous for resistance gene Tm-i) to tobacco mosaic virus (TMV) isolates of Pelham type o and between isogenic lines of cv. Craigella, susceptible and homozygous for gene Tm-i. The grafted plants were inoculated with a type o isolate; both scion and stock inoculation were studied in the former, scion inoculation only, in the latter. With scion inoculation the virus content of a tolerant scion was greater on a susceptible stock than on a tolerant one, but that of a susceptible scion was unaffected by the type of stock: in contrast, the virus content of a tolerant stock was unaffected by the type of scion but that of a susceptible stock was less with a tolerant than with a susceptible scion. With root inoculation the virus contents of both tolerant and susceptible scions were greater on a susceptible than on a tolerant stock. With cv. Craigella the genotype Tm-1/Tm-1 was found to be immune to the type o isolate used, but in grafts the leaves of Tm-1/Tm-1 scions became tolerant to leaf inoculation when on susceptible stocks and the virus entered the stock. Tm-1/Tm-1 stocks became infected when attached to infected, susceptible scions and did not affect the virus content of those scions. The results indicate that a susceptible healthy stock may change the reaction of a tolerant or immune scion to infection by a strain of TMV. |
| |
Keywords: | |
|
|