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The ability of deoxyribonucleic acid (DNA) isolated from a number of actinomycetes to reassociate with reference DNA fromActinoplanes philippinensis orStreptomyces venezuelae has been measured. All of the DNA preparations except for those fromNocardia erythropolis andThermomonospora viridis contained 70 to 73 moles per cent guanine and cytosine. DNA from two species ofActinoplanes , two species ofDactylosporangium , andAmpullariella digitata formed extensive thermally stable duplexes with theActinoplanes philippinensis reference. DNA from streptomycetes formed duplexes with theA. philippinensis reference, but these duplexes possessed low thermal stability. DNA fromN. erythropolis andT. viridis did not bind significant amounts of this reference DNA. Only DNA fromStreptomyces albus, Streptoverticillium baldaccii , andMicroellobosporia flavea appreciably bound theStreptomyces venezuelae reference. Our results separate the actinomycetes forming sporangia into two groups: the first group containedActinoplanes, Dactylosporangium , andAmpullariella; the second group containedPlanomonospora, Spirillospora , andStreptosporangium .

Reassociation of Deoxyribonucleic Acids fromActinoplanesand Other Actinomycetes