Microcystin production in epiphytic cyanobacteria on submerged macrophytes

Mohamed, Zainal Abidin; Shehri, Abdulrahman M. Al

doi:10.1016/j.toxicon.2010.02.007

Cited by 34 publications

(6 citation statements)

References 30 publications

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“…Seifert et al, 2007;Wood et al, 2007Wood et al, , 2010Fiore et al, 2009;Mohamed and Al Sheri, 2009;Mohamed and Al Shehri, 2010;Osswald et al, 2009;Bernard et al, 2010). This research has shown that R. mediterranea can produce CYN and deoxy-CYN at concentrations comparable to C. raciborskii and should therefore be considered as a potential CYN-producer when assessing the suitability of raw waters for beneficial use including drinking water and primary contact recreational activities.…”

Section: Discussionmentioning

confidence: 83%

Report of the cyanotoxins cylindrospermopsin and deoxy-cylindrospermopsin from Raphidiopsis mediterranea Skuja (Cyanobacteria/Nostocales)

et al. 2011

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Section: Discussionmentioning

confidence: 83%

Report of the cyanotoxins cylindrospermopsin and deoxy-cylindrospermopsin from Raphidiopsis mediterranea Skuja (Cyanobacteria/Nostocales)

et al. 2011

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“…In this pond, low phytoplankton densities have been observed close to S. aloides, but this macrophyte was largely covered with epiphytic cyanobacteria (MOHAMED and AL-SHEHRI, 2010). These observations are most likely the result of several interaction processes including allelopathy.…”

Section: Introductionmentioning

confidence: 80%

“…Tanumah pond is about 2000 m 2 and located 120 km north of Abha city (19 10° N, 42 04° E). We used axenic cultures of epiphytic cyanobacteria (Merismopedia tennuissima, Leptolyngbya boryana) and the planktonic cyanobacterium, Anabaena variabilis, that were previously isolated from epiphytic material and phytoplankton samples from the same pond where the macophyte S. aloides was collected (MOHAMED and AL-SHEHRI, 2010). Stratiotes plants were carefully rinsed with tap water and dried with filter papers.…”

Section: Macrophyte and Target Organismsmentioning

confidence: 99%

Differential Responses of Epiphytic and Planktonic Toxic Cyanobacteria to Allelopathic Substances of the Submerged Macrophyte Stratiotes aloides

Mohamed

Shehri

2010

International Review of Hydrobiology

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The present study investigates the allelopathic effects of Stratiotes aloides on the growth and antioxidative biomarkers of epiphytic and planktonic toxic cyanobacteria in a batch experiment over a 15-day exposure to different concentrations of aqueous acetone extract of this macrophyte. The results showed that epiphytic and planktonic species of cyanobacteria showed differential responses to the allelopathic activity of this macrophyte. S. aloides extract reduced the growth, alkaline phosphatase activity (APA) and toxin production of the planktonic cyanobacterium, Anabaena variabilis, with an increase in lipid peroxidation, glutathione and activities of antioxidative enzymes of this cyanobacterium. Conversely, this extract did not affect the growth and increased the toxin production in epiphytic cyanobacteria, with no significant effect on lipid peroixdation or the activities of APA and antioxidative enzymes of these species. This study is the first to suggest that the macrophyte S. aloides supports the growth and toxin production of its epiphytic cyanobacteria.

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“…PPPs are a known target of the cyanobacterial produced toxins, microcystins and nodularins , which might explain the upregulation of a gene encoding a PPP in the CC cultures. Additionally, cyanobacteria of the genus Leptolyngbya are known to produce microcystins in a freshwater setting . ATP synthase is also inhibited by microcystins .…”

Section: Discussionmentioning

confidence: 99%

Gene expression analysis of a Louisiana native Chlorella vulgaris (Chlorophyta)/Leptolyngbya sp. (Cyanobacteria) co‐culture using suppression subtractive hybridization

Tate

Gutierrez-Wing

Rusch

et al. 2012

Engineering in Life Sciences

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Gene expression analysis of a Louisiana native Chlorella vulgaris (Chlorophyta)/Leptolyngbya sp. (Cyanobacteria) co-culture using suppression subtractive hybridizationA locally isolated co-culture of two photosynthetic species [Chlorella vulgaris (Chlorophyta) and Leptolyngbya sp. (Cyanobacteria)] displayed enhanced growth when compared to a Chlorella monoculture; however, the biological mechanisms driving such improvement are currently not well understood. To investigate these mechanisms, this study examined the differential gene expression in the Chlorella between the co-culture and the monoculture. Suppression subtractive hybridization was performed between mRNA from Chlorella in the co-culture and in a monoculture, and 105 genes were identified as being putatively differentially expressed. Nine of these genes, corresponding to the key functional categories of energy, metabolism, and protein synthesis, were further examined using quantitative real-time PCR and showed differential regulation of photosystem I and photosystem II and upregulation of stress-response genes and a gene encoding an oil-globule-associated gene in the coculture Chlorella. This differential gene expression study of a Chlorella/cyanobacteria co-culture will aid in the development of culture strategies capable of taking advantage of these differences for the production of biomass and bioproducts of interest. Knowledge of the underlying genetic causes of the changes in growth and productivity of the species in co-culture provides insights on possible target genes for optimization of the culture.

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Microcystin production in epiphytic cyanobacteria on submerged macrophytes

Cited by 34 publications

References 30 publications

Report of the cyanotoxins cylindrospermopsin and deoxy-cylindrospermopsin from Raphidiopsis mediterranea Skuja (Cyanobacteria/Nostocales)

Report of the cyanotoxins cylindrospermopsin and deoxy-cylindrospermopsin from Raphidiopsis mediterranea Skuja (Cyanobacteria/Nostocales)

Differential Responses of Epiphytic and Planktonic Toxic Cyanobacteria to Allelopathic Substances of the Submerged Macrophyte Stratiotes aloides

Gene expression analysis of a Louisiana native Chlorella vulgaris (Chlorophyta)/Leptolyngbya sp. (Cyanobacteria) co‐culture using suppression subtractive hybridization

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