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A detached-leaf bioassay was used to evaluate peach [ Prunus persica  (L.) Batsch] somaclone 122-1 (derived from callus produced on an immature embryo of peach cultivar Redhaven) for resistance to several virulent strains of  Xanthomonas campestris  pv.  pruni  [E.F. Sm.) Dows], causal agent of bacterial leaf spot ,  and to a virulent isolate of  Pseudomonas syringae  van Hall pv.  syringae,  causal agent of bacterial canker. The detached-leaf bioassay was also used to evaluate progeny of 122-1 for resistance to  X. campestris  pv.  pruni  virulent strain XP1. Somaclone 122-1 was significantly more resistant to most strains of  X. campestris  pv.  pruni  than was `Redhaven', and all of its progeny exhibited high levels of resistance to  X. campestris  pv.  pruni  strain XP1. Somaclone 122-1 exhibited significantly higher levels of resistance to  Pseudomonas syringae  pv.  syringae  than did `Redhaven' and this resistance was retained over time in the greenhouse and following a 2-year cycle of tissue culture propagation.

Resistant Responses of Peach Somaclone 122-1 to Xanthomonas campestris pv. pruni and to Pseudomonas syringae pv. syringae