Abstract
Four phages infectious to Mesorhizobium strains were identified in soil samples taken from local Robinia pseudoacacia stands. Based on their polyhedral heads and short noncontractile tails, three of the phages, Mlo30, Mam12, and Mam20, were assigned to group C of Bradley’s classification, the Podoviridae family, while phage Mlo1, with its elongated hexagonal head and a long flexible tail represented subgroup B2 bacteriophages, the Siphoviridae family. The phages were homogeneous in respect of their virulence, as they only lysed Mesorhizobium strains, but did not affect strains of Rhizobium or Bradyrhizobium. On the basis of one-step growth experiments, the average virus yield was calculated as approximately 10–25 phage particles for phages Mlo30, Mam12 and Mam20, and as many as 100–120 for phage Mlo1. The rate of phage adsorption to heat-treated cells showed differences in the nature of their receptors, which seemed to be thermal sensitive, thermal resistant, or a combination of the two. Only the receptor for phage Mlo30 was likely to be an LPS molecule, which was supported by a neutralization test. The smooth LPS with O-antigenic chains of the phage-sensitive M. loti strain completely reduced the bactericidal activity of virions at a concentration of 1 μg/ml. The molecular weights of phage DNAs estimated from restriction endonuclease cleavage patterns were in the range from ~39 kb for group C phages to ~80 kb for B2.
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Acknowledgments
The authors wish to thank Prof. K. Lindström (Department of Applied Chemistry and Microbiology, University of Helsinki, Finland) for M. loti and M. mediterraneum strains and Prof. W.X. Chen (Department of Microbiology, College of Biology, Beijing Agricultural University, Beijing, People’s Republic of China) for M. huakuii strains. This study was supported by a grant from the Rector of M. Curie-Sklodowska University, Poland.
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Turska-Szewczuk, A., Pietras, H., Pawelec, J. et al. Morphology and General Characteristics of Bacteriophages Infectious to Robinia pseudoacacia Mesorhizobia. Curr Microbiol 61, 315–321 (2010). https://doi.org/10.1007/s00284-010-9613-6
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DOI: https://doi.org/10.1007/s00284-010-9613-6