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Host specificity in the Richelia - diatom symbiosis revealed by hetR gene sequence analysis
Department of Marine Sciences, University of Kalmar.
Department of Botany, Stockholm University.
Department of Botany, Stockholm University.
Marine Sciences Research Center, Stony Brook, NY.
1999 (English)In: Environmental Microbiology, ISSN 1462-2912, E-ISSN 1462-2920, Vol. 1, no 5, 431-438 p.Article in journal (Refereed) Published
Abstract [en]

The filamentous heterocyst-forming cyanobacterium Richelia intracellularis forms associations with diatoms and is very abundant in tropical and subtropical seas. The genus Richelia contains only one species, R. intracellularis Schmidt, although it forms associations with several diatom genera and has considerable variation in size and morphology. The genetic diversity, and possible host specificity, within the genus Richelia is unknown. Using primers against hetR, a gene unique for filamentous cyanobacteria, specific polymerase chain reaction (PCR) products were obtained from natural populations of R. intracellularis filaments associated with three diatom genera. Phylogenetic analyses of these sequences showed that they were all in the same clade. This clade contained only the R. intracellularis sequences. The genetic affiliation of hetR sequences of R. intracellularis to those of other heterocystous cyanobacteria strongly suggests that it was not closely related to endosymbiotic Nostoc spp, hetR sequences. Sequences from R, intracellularis-Hemiaulus membranaceus sampled in the Atlantic and Pacific Oceans were almost identical, demonstrating that the genetic relatedness was not dependent on geographical location, All sequences displayed a deep divergence between symbionts from different genera and a high degree of host specificity.

Place, publisher, year, edition, pages
1999. Vol. 1, no 5, 431-438 p.
National Category
Natural Sciences
Identifiers
URN: urn:nbn:se:sh:diva-17126ISI: 000084962800009OAI: oai:DiVA.org:sh-17126DiVA: diva2:558068
Funder
Swedish Research Council
Available from: 2012-10-01 Created: 2012-10-01 Last updated: 2012-10-01Bibliographically approved
In thesis
1. Heterocystous cyanobacteria living within symbiosomes: genetic and physiological aspects
Open this publication in new window or tab >>Heterocystous cyanobacteria living within symbiosomes: genetic and physiological aspects
2005 (English)Doctoral thesis, comprehensive summary (Other academic)
Place, publisher, year, edition, pages
Kalmar: Högskolan i Kalmar, 2005. 30 p.
Series
, Dissertation series / University of Kalmar, Faculty of Natural Science, ISSN 1650-2779 ; 20
Keyword
Microbiology, cyanobacteria, plants, symbiosis, nitrogen-fixation
National Category
Natural Sciences
Identifiers
urn:nbn:se:sh:diva-17116 (URN)91-89584-42-2 (ISBN)
Public defence
(English)
Opponent
Supervisors
Funder
Swedish Research Council
Available from: 2012-10-01 Created: 2012-10-01 Last updated: 2012-10-01Bibliographically approved

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