Abstract

Fifteen mycoplasmalike organism (MLO) strains from North America and Europe, including aster yellows (AY), tomato big bud (BB), clover phyllody (CPh), chrysanthemum yellows (CY), and unknown MLOs, were studied. These MLOs are among those previously identified, on the basis of dot hybridizations, as members of the AY MLO strain cluster. Restriction fragment length polymorphism (RFLP) analyses revealed that all 15 strains can be classified into three genomic types: type I (typified by eastern AY MLOs), type II (e.g., western AY and CY MLOs), and type III (e.g., CPh MLO) (...)

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