DNA-DNA homology studies among strains ofHaloferaxand other halobacteria

摘要

Deoxyribonucleic acid (DNA)-DNA hybridization was used to determine the relationships of the type strains of the three species of the genusHaloferaxto 21 halobacterial strains representing isolates from hypersaline habitats and collection strains. Two genotypic groups with high DNA homology were obtained, belonging to the speciesHaloferax gibbonsiiandHaloferax mediterranei. The highest DNA relatedness (≥74) was obtained in theHalobacterium salinariumgroup.Halobacterium denitrificansshowed very low DNA homology with the other halobacteria investigated. The G+C content of the eight strains ofHaloferaxtested ranged between 59.1 and 65.5 mol