Evidence of the cost of the production of microcystins by Microcystis aeruginosa under differing light and nitrate environmental conditions.

The cyanobacterium Microcystis aeruginosa is known to proliferate in freshwater ecosystems and to produce microcystins. It is now well established that much of the variability of bloom toxicity is due to differences in the relative proportions of microcystin-producing and non-microcystin-producing c...

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Autores principales:	Enora Briand, Myriam Bormans, Catherine Quiblier, Marie-José Salençon, Jean-François Humbert
Formato:	article
Lenguaje:	EN
Publicado:	Public Library of Science (PLoS) 2012
Materias:	Medicine R Science Q
Acceso en línea:	https://doaj.org/article/c07d861085404b769fbdae84b4290f63
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spelling	oai:doaj.org-article:c07d861085404b769fbdae84b4290f632021-11-18T07:29:51ZEvidence of the cost of the production of microcystins by Microcystis aeruginosa under differing light and nitrate environmental conditions.1932-620310.1371/journal.pone.0029981https://doaj.org/article/c07d861085404b769fbdae84b4290f632012-01-01T00:00:00Zhttps://www.ncbi.nlm.nih.gov/pmc/articles/pmid/22276137/pdf/?tool=EBIhttps://doaj.org/toc/1932-6203The cyanobacterium Microcystis aeruginosa is known to proliferate in freshwater ecosystems and to produce microcystins. It is now well established that much of the variability of bloom toxicity is due to differences in the relative proportions of microcystin-producing and non-microcystin-producing cells in cyanobacterial populations. In an attempt to elucidate changes in their relative proportions during cyanobacterial blooms, we compared the fitness of the microcystin-producing M. aeruginosa PCC 7806 strain (WT) to that of its non-microcystin-producing mutant (MT). We investigated the effects of two light intensities and of limiting and non-limiting nitrate concentrations on the growth of these strains in monoculture and co-culture experiments. We also monitored various physiological parameters, and microcystin production by the WT strain. In monoculture experiments, no significant difference was found between the growth rates or physiological characteristics of the two strains during the exponential growth phase. In contrast, the MT strain was found to dominate the WT strain in co-culture experiments under favorable growth conditions. Moreover, we also found an increase in the growth rate of the MT strain and in the cellular MC content of the WT strain. Our findings suggest that differences in the fitness of these two strains under optimum growth conditions were attributable to the cost to microcystin-producing cells of producing microcystins, and to the putative existence of cooperation processes involving direct interactions between these strains.Enora BriandMyriam BormansCatherine QuiblierMarie-José SalençonJean-François HumbertPublic Library of Science (PLoS)articleMedicineRScienceQENPLoS ONE, Vol 7, Iss 1, p e29981 (2012)
institution	DOAJ
collection	DOAJ
language	EN
topic	Medicine R Science Q
spellingShingle	Medicine R Science Q Enora Briand Myriam Bormans Catherine Quiblier Marie-José Salençon Jean-François Humbert Evidence of the cost of the production of microcystins by Microcystis aeruginosa under differing light and nitrate environmental conditions.
description	The cyanobacterium Microcystis aeruginosa is known to proliferate in freshwater ecosystems and to produce microcystins. It is now well established that much of the variability of bloom toxicity is due to differences in the relative proportions of microcystin-producing and non-microcystin-producing cells in cyanobacterial populations. In an attempt to elucidate changes in their relative proportions during cyanobacterial blooms, we compared the fitness of the microcystin-producing M. aeruginosa PCC 7806 strain (WT) to that of its non-microcystin-producing mutant (MT). We investigated the effects of two light intensities and of limiting and non-limiting nitrate concentrations on the growth of these strains in monoculture and co-culture experiments. We also monitored various physiological parameters, and microcystin production by the WT strain. In monoculture experiments, no significant difference was found between the growth rates or physiological characteristics of the two strains during the exponential growth phase. In contrast, the MT strain was found to dominate the WT strain in co-culture experiments under favorable growth conditions. Moreover, we also found an increase in the growth rate of the MT strain and in the cellular MC content of the WT strain. Our findings suggest that differences in the fitness of these two strains under optimum growth conditions were attributable to the cost to microcystin-producing cells of producing microcystins, and to the putative existence of cooperation processes involving direct interactions between these strains.
format	article
author	Enora Briand Myriam Bormans Catherine Quiblier Marie-José Salençon Jean-François Humbert
author_facet	Enora Briand Myriam Bormans Catherine Quiblier Marie-José Salençon Jean-François Humbert
author_sort	Enora Briand
title	Evidence of the cost of the production of microcystins by Microcystis aeruginosa under differing light and nitrate environmental conditions.
title_short	Evidence of the cost of the production of microcystins by Microcystis aeruginosa under differing light and nitrate environmental conditions.
title_full	Evidence of the cost of the production of microcystins by Microcystis aeruginosa under differing light and nitrate environmental conditions.
title_fullStr	Evidence of the cost of the production of microcystins by Microcystis aeruginosa under differing light and nitrate environmental conditions.
title_full_unstemmed	Evidence of the cost of the production of microcystins by Microcystis aeruginosa under differing light and nitrate environmental conditions.
title_sort	evidence of the cost of the production of microcystins by microcystis aeruginosa under differing light and nitrate environmental conditions.
publisher	Public Library of Science (PLoS)
publishDate	2012
url	https://doaj.org/article/c07d861085404b769fbdae84b4290f63
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Evidence of the cost of the production of microcystins by Microcystis aeruginosa under differing light and nitrate environmental conditions.

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