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Diversity of cyanophages infecting the heterocystous filamentous cyanobacterium Nodularia isolated from the brackish Baltic Sea
Jenkins, C.A.; Hayes, P.K. (2006). Diversity of cyanophages infecting the heterocystous filamentous cyanobacterium Nodularia isolated from the brackish Baltic Sea. J. Mar. Biol. Ass. U.K. 86(3): 529-536. https://dx.doi.org/10.1017/S0025315406013439
In: Journal of the Marine Biological Association of the United Kingdom. Cambridge University Press/Marine Biological Association of the United Kingdom: Cambridge. ISSN 0025-3154; e-ISSN 1469-7769
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| Auteurs | | Top |
- Jenkins, C.A.
- Hayes, P.K.
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| Abstract |
A collection of 17 cyanophage isolates able to infect the heterocystous, filamentous cyanobacterium Nodularia spumigena has been established from the Baltic Sea. These cyanophages have been characterized based on their morphology, cross infectivity and genetic structure. Short fragments (450 bp) of the gene encoding the major capsid protein (g23) were amplified and sequenced from several isolates, and the encoded protein was found to be 99% identical across all the N. spumigena-specific cyanophages tested. These results suggest that the Nodularia-specific cyanophages are very closely related. However, these cyanophages were found to be diverse in terms of their morphology and host range. Cyanophages belonging to two families within the order Caudovirales, Myoviridae and Siphoviridae, were included in the collection of isolates. The cyanophage particles are large in comparison with cyanophages previously isolated from the marine environment, with the largest capsid measuring 127 x 122 x 888 nm. Host ranges of the cyanophage isolates varied, some being able to infect up to five genotypically distinct strains of Nodularia spumigena, while others were very specific, infecting only one strain. We conclude that Nodularia-specific cyanophages form a diverse community in surface waters during summer and autumn months and that they may play a role both in the transfer of genetic information between Nodularia lineages and in promoting changes in the genetic structure of the host population. |
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