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identification and characterization of plasmids from the western aster yellows mycoplasmalike organism.supercoiled double-stranded dna molecules (plasmids) were isolated from plants infected with three laboratory strains of western aster yellows mycoplasma-like organism (ay-mlo) by using cesium chloride-ethidium bromide density gradients. southern blot analysis, using plasmids from the severe strain of ay-mlo (say-mlo) as the probe, identified at least four plasmids in celery, aster, and periwinkle plants and in macrosteles severini leafhopper vectors infected with either the dwarf ay-mlo, tulela ...19902307660
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