Extracellular degradation of phenol by the cyanobacterium Synechococcus PCC 7002

Wurster, Martina; Mundt, S.; Hammer, Elke; Schauer, Frieder; Lindequist, U

doi:10.1023/a:1023840503605

Cited by 34 publications

(14 citation statements)

References 19 publications

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“…The isolated instance of eventual S. leopoliensis inhibition by E. canadensis occurred in August, i.e., at the only time of significant chlorophyte and diatom inhibition ( Figure 1) coupled with sprig biomass retention (Figure 2 and Table I), supporting this hypothesis. At least some of the anti-cyanobacteria allelochemicals produced by E. canadensis are phenolic compounds (Erhard and Gross, 2006), which Synechococcus may be able to neutralize (Wurster et al, 2003). S. leopoliensis thus may be able to neutralize the little (if any) phenolic compounds produced by subhealthy E. canadensis, but not the full-strength allelochemical production by actively growing E. canadensis.…”

Section: > Laboratory Experimentsmentioning

confidence: 99%

Seasonal and scale-dependent variability in nutrient- and allelopathy-mediated macrophyte–phytoplankton interactions

Lombardo

Mjelde

Källqvist

et al. 2013

Knowl. Managt. Aquatic Ecosyst.

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Key-words:Ceratophyllum demersum, Elodea canadensis, nutrients, allelopathy, alternate stable states in shallow lakes macrophyte-phytoplankton interactions were investigated using a dual laboratory and field approach during a growing season, with responses quantified as changes in biomass. Short-term, close-range interactions in laboratory microcosms always led to mutual exclusion of macrophytes (Elodea canadensis or Ceratophyllum demersum) and algae (Raphidocelis subcapitata, Fistulifera pelliculosa) or cyanobacteria (Synechococcus leopoliensis), suggesting regulation by positive feedback mechanisms, progressively establishing and reinforcing a "stable state". Laboratory results suggest that close-range regulation of R. subcapitata and F. pelliculosa by macrophytes was primarily via nutrient (N, P) mediation. Sprig-produced allelochemicals may have contributed to inhibition of S. leopoliensis in C. demersum presence, while S. leopoliensis was apparently enhanced by nutrients leaked by subhealthy (discolored leaves; biomass loss) E. canadensis. Seasonal changes in algal growth suppression were correlated with sprig growth. Marginal differences in in situ phytoplankton patterns inside and outside monospecific macrophyte stands suggest that the nutrient-and/or allelopathy-mediated closerange mechanisms observed in the laboratory did not propagate at the macrophyte-stand scale. Factors operating at a larger scale (e.g., lake trophic state, extent of submerged vegetation coverage) appear to override in situ macrophyte-phytoplankton close-range interactions. RÉSUMÉ Variabilité saisonnière et dépendante de l'échelle dans les interactions macrophytephytoplancton liées aux nutriments et à des relations d'allélopathie Mots-clés :Ceratophyllum demersum, Elodea canadensis, Les interactions macrophytes-phytoplancton ont été étudiées à l'aide d'une approche double de laboratoire et de terrain au cours d'une saison de croissance, avec des réponses quantifiées comme les changements dans la biomasse. Les interactions à court terme et à courte portée dans des microcosmes de laboratoire ont toujours conduit à l'exclusion mutuelle entre des macrophytes (Elodea canadensis ou Ceratophyllum demersum) et des algues (Raphidocelis subcapitata,

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Section: > Laboratory Experimentsmentioning

confidence: 99%

Seasonal and scale-dependent variability in nutrient- and allelopathy-mediated macrophyte–phytoplankton interactions

Lombardo

Mjelde

Källqvist

et al. 2013

Knowl. Managt. Aquatic Ecosyst.

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“…In another study, Synechococcus sp. PCC 7002 has been investigated for its ability to transform aniline, naphthalene and phenol (Wurster et al, 2003). Chemioeterotrophic bacteria and fungi are usually employed in steroid biotransformation, while cyanobacteria have been less investigated up to now .…”

Section: Discussionmentioning

confidence: 99%

Side-chain cleavage and C-20 ketone reduction of hydrocortisone by a natural isolate ofChroococcus dispersus

et al. 2007

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A unicellular cyanobacterium, Chroococcus dispersus (Keissl.) Lemmermann, was isolated from paddy-field and tested in biotransformation experiments of hydrocortisone (compound 1). This strain has not been previously examined for steroid substance modification. Fermentation was carried out in BG-11 medium supplemented with 0.05% substrate at 25 ºC for seven days incubation. The metabolites were chromatographically purified and characterised using spectroscopic methods. The fermentation yielded 11β,17α,20β,21-tetrahydroxypregn-4-en-3-one (compound 2), 11β,17β-dihydroxyandrost-4-en-3,17-dione (compound 3), and 11β-hydroxyandrost-4-en-3,17-dione (compound 4). Bioreaction characteristics observed were 20-ketone reduction for accumulation of compound 2 and side chain degradation of the substrate to give compounds 3 and 4. Time course study showed the accumulation of the product 2 from the second day of the fermentation and product 3 as well as product 4 from the third day. All the metabolites reached their maximum concentration in seven days. Aeration and continuous light or light duration (16/8 hours light/dark) have no effect on the transformation yield. Optimum concentration of the substrate, which gave maximum bioconversion efficiency, was 0.5 mg ml -1 in the transformation experiment. Growth was not influenced by the addition of steroid substrate. Biotransformation was completely inhibited when steroid concentration was above 2.0 mg ml -1 .

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“…The rest of the proportion was contributed by fatty acid derivatives (Table 3). Many studies have been published since the Gulf war (1990-1991), on the efficiency of cyanobacteria to accumulate and degrade a vast range of environmental pollutants, including pesticides [35], crude oil [36], polycyclic aromatic hydrocarbons, phenol and catechol [37] and xenobiotics [38], but the hydrocarbon degradation potential of cyanobacteria is in question heretofore, due to lack of data with axenic cultures. Most of the authors who investigated the potential of cyanobacteria to degrade straight chain and branched alkanes, aromatic hydrocarbons, and organosulphur compounds concluded that non axenic cultures of cyanobacterial species such as Aphanothece halophytica, Dactylococcopsis salina, Halothece sp.…”

Section: Reduction In Organics and Trace Metals After Cyanobacterial mentioning

confidence: 99%

Evaluation of cyanobacterial endolith Leptolyngbya sp. ISTCY101, for integrated wastewater treatment and biodiesel production: A toxicological perspective

Singh

Thakur

2015

Algal Research

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Extracellular degradation of phenol by the cyanobacterium Synechococcus PCC 7002

Cited by 34 publications

References 19 publications

Seasonal and scale-dependent variability in nutrient- and allelopathy-mediated macrophyte–phytoplankton interactions

Seasonal and scale-dependent variability in nutrient- and allelopathy-mediated macrophyte–phytoplankton interactions

Side-chain cleavage and C-20 ketone reduction of hydrocortisone by a natural isolate ofChroococcus dispersus

Evaluation of cyanobacterial endolith Leptolyngbya sp. ISTCY101, for integrated wastewater treatment and biodiesel production: A toxicological perspective

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