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These terms define your current search. Click the × to remove a term. Breeding and Genetic Improvement: genetic resources > varieties > seedless varieties × 25 items, grouped by Taxa - Viruses and Viroids (view ungrouped items) positive sense, single-stranded RNA viruses (1)    (Click to View) Girdling and grapevine leafroll associated viruses affect berry weight, colour development and accumulation of anthocyanins in 'Crimson Seedless' grapes during maturation and ripening Plant science