PHENOTYPIC AND GENETIC DIVERSITIES ARE NOT CORRELATED IN STRAINS OF THE CYANOBACTERIUM MICROCYSTIS AERUGINOSA ISOLATED IN SW SPAIN
2013; University of Málaga; Issue: 38 Linguagem: Inglês
ISSN
2340-5074
AutoresVictoria López Rodas, Eduardo Costas, Antonio Flores‐Moya,
Tópico(s)Microbial Community Ecology and Physiology
ResumoPhenotypic and genetic diversities are not correlated in strains of the cyanobacterium Microcystis aeruginosa isolated in SW Spain. The cyanobacterium Microcystis aeruginosa (Kutzing) Kutzing is notorious for forming extensive and toxic blooms but the genetic structure of natural populations, and in particular during blooms, remains to be explored. In order to add more knowledge about the genetic structure of M. aeruginosa, we compared phenotypic and genetic variabilities in seventeen strains of M. aeruginosa isolated from three adjacent water bodies in SW Spain (the consecutive reservoirs La Minilla and El Gergal, and small pools in Donana National Park). For this purpose, a phenetic tree, based on six phenotypic traits (including morphology of cells, photosynthetic and respiratory performance, and toxin production) was compared with a phylogenetic tree built by using the 16S-23S rDNA Internal Transcribed Spacer sequence. Whereas the strains isolated from La Minilla showed a relatively homogeneous phenotype, the phenotypic traits of the remaining strains did not discriminate between the other two water bodies. On the other hand, only a strain isolated in Donana National Park showed a slightly different ITS sequence, but the sequences from the remaining strains were similar. Possible explanations for this discrepancy between phenotypic and genetic diversities are discussed.
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