Summary: A small defective generalized transducing bacteriophage (CA3) has been detected in culture supernatants of the nitrogen-fixing hydrogen bacterium GZ29. This phage had a head diameter of 37 to 43 nm, and it had a low specific density of 1.349 g cm, probably due to a small DNA molecule of 3.3 × 10 molecular weight. The phage did not form plaques on any of the strains tested and therefore was detectable only by its transducing activity and by electron microscopy. All genetic markers tested were transducible at frequencies of about 10 per marker per phage particle. No cotransduction of markers was detected. Due to the high transduction rate and the small size of the DNA molecule, it is assumed that CA3 particles contain mainly or exclusively chromosomal DNA.


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