Copper Resistance inPseudomonas syringaepv.syringaefrom Cherry Orchards and its Associated Transfer in Vitro and in Planta with a Plasmid

A resulting exconjugant was successfully used as a donor strain in matings with two recipient strains. Copper resistance also was transferred when suspensions of donor and recipient strains were infiltrated into bean leaves. Populations of copper-sensitive strains of P. s. syringae were reduced significantly more than populations of copper-resistant strains on bean leaves sprayed with cupric hydroxide. All P. s. morsprunorum detected in blossom samples was copper sensitive, and copper resistance was not transferred from P. s. syringae in filter matings to P. s. morsprunorum