Rooting success of rose cuttings reduced by infection with Apple mosaic virus and Prunus necrotic ringspot virus.

摘要

The ability of rose cuttings from virus-infected stock to root was studied in Rosa hybrida cv. Dr. Huey, a commonly used rootstock cultivar. Stock was infected with Apple mosaic virus (ApMV), Prunus necrotic ringspot virus (PNRSV) and a mixed infection of both ApMV and PNRSV; stock which was indexed negative for the virus was used as a control. Virus infection reduced total percent rooting by an average of 35% compared to healthy ones. Root vigour was also negatively affected by virus infection. The diameters of the cuttings from one virus treatment consisting of a mixed infection of ApMV + PNRSV were significantly smaller than the healthy ones, but not in the other 2 virus treatments. It is possible that in some cases, rooting reduction is an indirect effect, due mainly to a decrease in stem diameter, stored carbohydrates and vigour.