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Effects of two soil-borne viruses of sugarbeet and their fungal vector, Polymyxa betae, on virus accumulation and plant growth in sugarbeet



Effects of two soil-borne viruses of sugarbeet and their fungal vector, Polymyxa betae, on virus accumulation and plant growth in sugarbeet



Phytopathology 92(6 Suppl.): S87



Soils naturally infested with cultures of avirulent Polymyxa betae and P. betae infected with the two sugar beet benyviruses BNYVV and BSBMV, alone and in combination, were compared to non-infested soil with regard to their effects on virus content, fresh plant weight, and seedling emergence. Both a variety with resistance to BNYVV (Rz), the cause of Rhizomania, and a Rhizomania-susceptible variety (rz) were examined. These studies clearly demonstrated that the Rz resistance gene does not confer resistance to BSBMV. Additionally, P. betae alone had a significant negative effect on growth of sugarbeet. BSBMV titers were significantly higher in single infections than in mixed infections with BNYVV in both resistant and susceptible varieties. In contrast, BNYVV titers were very high in single and in mixed infections in the Rhizomania-susceptible variety, but low in the resistant variety. It appears that even at low levels, BNYVV either out competes or suppresses BSBMV.

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