Iron starvation increases toxicity of Microcystis aeruginosa CYA 228/1 (Chroococcales, Cyanophyceae)

Lyck, Susanne; Gjølme, Nina; Utkilen, Hans

doi:10.2216/i0031-8884-35-6s-120.1

Cited by 44 publications

(35 citation statements)

References 9 publications

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“…Les travaux de KERRY ef al. (1988), LYCK et al (1996) et ORR et JONES (1998 montrent que cette production, chez Microcystis aeruginosa, est fortement influencée par :…”

Section: -Discussionunclassified

Première évaluation du risque toxique lié aux cyanobactéries d'eau douce en France : le programme " EFFLOCYA "

Sarazin¹,

Quiblier-Llobéras²,

Bertru³

et al. 2005

rseau

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Une enquête menée à l'aide d'un questionnaire couvrant l'ensemble du territoire français ainsi que l'étude spécifique d'écosystèmes aquatiques de type lacs et réservoirs ont permis de montrer que les proliférations de cyanobactéries toxiques pouvaient a priori affecter n'importe quel plan d'eau de l'Héxagone. Les genres rencontrés responsables de la production de toxines, le plus souvent hépatiques, sont Microcystis, Planktothrix, Anabœna et Cylindrospermopsis.Les efflorescences peuvent se produire tout au long de l'année car certaines espèces sont adaptées aux eaux froides et elles ne sont pas liées de manière univoque à un état eutrophe de l'écosystème.La production toxinique est la plus élevée lorsque les populations cyanobactériennes sont peu ou pas diversifiées et à la lumière de travaux récents, cette production serait favorisée, en ce qui concerne les microcystines, par un milieu riche en nitrate, pauvre en ammonium et fortement carencé en fer.La suite à donner à ce travail pourrait être la création d'un observatoire national des efflorescences toxiques.An inquiry covering the whole French territory together with specific studies of natural and artificial reservoirs has been made to assess the human health risk related to the prolifération of toxin producing blue green algae (cyanobacteria). The conclusions show that any lentic ecosystem can be affected like it has been shown already in other countries all over the world and more specifically within the EU. The main genus concemed are: Microcystis, Planktothrix, Anabœna and Cylindrospermopsis.Blooms can occur juring the whole year since some species are well adapted to cold water and are not clearly linked with the trophic status of the aquatic ecosystem.The toxinic production is the largest when the cyanobacteria populations contain only a few number of species. The results of recent works are well correlated with our findings which show that the production of toxic heptapeptides (microcystins) could be correlated with high levels of nitrate and depletions of ammonium and iron.The follow up of this work should now include the set up of a national observatory of toxic algal blooms

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“…Les travaux de KERRY ef al. (1988), LYCK et al (1996) et ORR et JONES (1998 montrent que cette production, chez Microcystis aeruginosa, est fortement influencée par :…”

Section: -Discussionunclassified

Première évaluation du risque toxique lié aux cyanobactéries d'eau douce en France : le programme " EFFLOCYA "

Sarazin¹,

Quiblier-Llobéras²,

Bertru³

et al. 2005

rseau

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“…After the IronEx II (Coale et al 1996, Behrenfeld et al 1996Kirchman 1996) it was established that deprivation of iron unequivocally limits cell division rates, abundance and production rate in phytoplankton (Frost 1996). Moreover, iron nutritional status of phytoplankton is of great interest, while toxin production (Lyck et al 1996) or undesirable blooms of cyanobacteria may be related to iron availability (Behrenfeld et al 1996).…”

Section: Introductionmentioning

confidence: 99%

Iron stress and genetic response in cyanobacteria : fur genes from Synechococcus PCC 7942 and Anabaena PCC 7120

Hernández

Artieda

Peleato

et al. 2002

Ann. Limnol. - Int. J. Lim.

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“…An overall decrease in MC production by both cyanobacteria in response to excess iron seems to support the theory that MC acts as an iron chelator (Utkilen and Gjølme, 1995). When exposed to low iron conditions, cyanobacteria usually respond by increasing MC production (Utkilen and Gjølme, 1995; Lyck et al, 1996). It is possible that when growing in excess iron, the cyanobacteria do not require MC to function as an iron chelator and therefore can decrease production of the toxin.…”

Section: Discussionmentioning

confidence: 99%

Section: +mentioning

confidence: 96%

“…Lyck et al, (1996) found that MC producing M. aeruginosa strains were also able to recover from iron starvation faster than non-microcystin producers. Again, MC production increased with iron starvation (Lyck et al, 1996). Not only does iron starvation lead to increased MC production but it triggers synthesis of the most toxic variant, MC-LR (Sevilla et al, 2008).…”

Section: +mentioning

confidence: 96%

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The Roles of Microcystin and Sulfide in Physiology and Tactic Responses of Pathogenic and Non-Pathogenic Mat-Forming Cyanobacteria

Brownell¹

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Planktothricoides raciborskii and Roseofilum reptotaenium are physiologically similar, yet ecologically distinct organisms found in a hot spring outflow and coral black band disease (BBD), respectively. The aim of this study was to elucidate the relationship between R. reptotaenium and sulfide in BBD, to compare microcystin (MC) production in response to environmental factors, and to determine chemotactic responses to MC and sulfide by the two organisms. Results showed that the pathogenicity of R. reptotaenium in BBD is dependent on sulfate-reducing bacteria as secondary pathogens. Roseofilum reptotaenium produced significantly more MC than P. raciborskii, as measured using ELISA. Roseofilum reptotaenium was negatively chemotactic to sulfide, determined using horizontal and vertical gradients in agar, while P. raciborskii was not affected.Neither cyanobacterium was chemotactic to MC in the agar assays. The ecophysiology of P. raciborskii and R. reptotaenium in relation to MC production and response to sulfide reflected their pathogenic versus non-pathogenic status.

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Iron starvation increases toxicity of Microcystis aeruginosa CYA 228/1 (Chroococcales, Cyanophyceae)

Cited by 44 publications

References 9 publications

Première évaluation du risque toxique lié aux cyanobactéries d'eau douce en France : le programme " EFFLOCYA "

Première évaluation du risque toxique lié aux cyanobactéries d'eau douce en France : le programme " EFFLOCYA "

Iron stress and genetic response in cyanobacteria : fur genes from Synechococcus PCC 7942 and Anabaena PCC 7120

The Roles of Microcystin and Sulfide in Physiology and Tactic Responses of Pathogenic and Non-Pathogenic Mat-Forming Cyanobacteria

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