Interactions between plankton and cyanobacterium Anabaena with focus on salinity, growth and toxin production

Changes in metabolites, antioxidant system, and gene expression in Microcystis aeruginosa under sodium chloride stress

“…In addition, there were significant interactions between the two factors. The intracellular MC content increased compared to the control after exposure to NaCl and was consistent with previous studies (Engström-Öst et al, 2011;Pezzolesi et al, 2012). The extracellular MC content also increased in response to increasing NaCl concentrations.…”

“…Previous studies showed that MC production is affected by environmental stress (e.g. temperature, light, salinity, nutrient and nonylphenol) (Engström-Öst et al, 2011;Pezzolesi et al, 2012;Wang et al, 2007). In this study, both intracellular and Table 1 Primer sequences, amplicon size, and accession number of seven genes for real-time PCR.…”

Effects of iron on growth, antioxidant enzyme activity, bound extracellular polymeric substances and microcystin production of Microcystis aeruginosa FACHB-905

“…According to previous studies, it is observed in the analyses of other nutrients like phosphorous and nitrogen, that the postulated linear relationship between growth rate and toxin production (Vezie et al, 2002;Downing et al, 2005;Dai et al, 2008;Van de Waal et al, 2009) is not a straightforward one, and MC levels have also been shown to increase during growth-limiting low Fe stress (Lukac and Aegerter, 1993;Dittmann et al, 2001;Kardinaal et al, 2007). Reports also suggested that MC may influence the physiology of M. aeruginosa as intraspecific signaling molecules and increasing MC concentration may serve as an inducible defense against normal conditions (Engström-Öst et al, 2011). Hence, iron is likely to be a factor regulating MC-LR production according to our study, but the physiological role of MC under iron variation still remains unclear.…”

Elemental Composition of C, N and P in Single Cells of Three Filamentous Cyanobacteria Using Nmp (Nuclear Microprobe) and Traditional Techniques

“…The particulate P analyses were performed according to the method described by [14]. Finally each sample was analysed using PO 4 reagents for nutrient analysis [19] and measured in a spectrophotometer (CADAS 100, DR LANGE) at 882 nm.…”

“…The most abundant species in the yearly recurrent cyanobacterial blooms in the Baltic Sea are the non-toxic Aphanizomenon flos-aquae and the hepatotoxic Nodularia spumigena [18]. Anabaena sp., also hepatotoxic, is also present, but usually represents less than 10% of the total community cell numbers [4]. The aim of this study was to investigate how comparable the NMP techniques are towards traditional bulk techniques with respect to the C, N and P cellular content of three cyanobacteria species.…”