Salinity Tolerance of the Chlorophyll b-synthesizing Cyanobacterium Prochlorothrix hollandica Strain SAG 10.89

Bergmann, Ingo; Geiss-Brunschweiger, Ulrike; Hagemann, Martin; Schoor, Arne

doi:10.1007/s00248-007-9311-5

Cited by 10 publications

(11 citation statements)

References 40 publications

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“…The observed zonation of phototrophs could indeed be governed by the pH and/or salinity gradient across the observed growth zones. For the phototrophic community to cope with these microenvironmental changes in physico‐chemical conditions, it requires either motility and/or metabolic plasticity (Bergman et al ., ). Cyanobacteria generally tolerate more alkaline conditions (pH 8–10) than diatoms (Brock, ; Goldman et al ., ; Kupriyanova et al ., ).…”

Section: Discussionmentioning

confidence: 99%

Phototrophic microbes form endolithic biofilms in ikaite tufa columns (SW Greenland)

Trampe

Castenholz

Larsen

et al. 2017

Environmental Microbiology

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Marine tufa-columns, formed by the hydrated carbonate mineral ikaite, present a unique alkaline microbial habitat only found in Ikka Fjord (SW-Greenland). The outermost parts of the ikaite columns exhibit a multitude of physico-chemical gradients, and the porous ikaite is colonized by endolithic phototrophic biofilms serving as a substrate for grazing epifauna, where scraping by sea urchins affects overall column-topography. We present a detailed study of the optical microenvironment, spatial organization, and photosynthetic activity of endolithic phototrophs within the porous ikaite crystal matrix. Cyanobacteria and diatoms formed distinctly coloured zones and were closely associated with ikaite-crystals via excretion of exopolymers. Scalar-irradiance measurements showed strong attenuation of visible light (400-700 nm), where only ∼1% of incident irradiance remained at 20 mm depth. Transmission spectra showed in vivo absorption signatures of diatom and cyanobacterial photopigments, which were confirmed by HPLC-analysis. Variable-chlorophyll-fluorescence-imaging showed active photosynthesis with high-light acclimation in the outer diatom layer, and low-light acclimation in the underlying cyanobacterial part. Phototrophs in ikaite thus thrive in polymer-bound endolithic biofilms in a complex gradient microhabitat experiencing constant slow percolation of highly alkaline phosphate-enriched spring water mixing with cold seawater at the tufa-column-apex. We discuss the potential role of these biofilms in ikaite column formation.

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Section: Discussionmentioning

confidence: 99%

Phototrophic microbes form endolithic biofilms in ikaite tufa columns (SW Greenland)

Trampe

Castenholz

Larsen

et al. 2017

Environmental Microbiology

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“…Stomatal factors include the decrease of g s and the reduction of C i caused by stomatal closure (Stępień andKłbus 2006, Youssef andAwad 2008). Nonstomatal factors include the decrease in chlorophyll (Chl) content (Ranjbarfordoei et al 2006, Gratani et al 2008, the changes in chloroplast ultrastructure (Bergmann et al 2008), the depression in photosystem activity and electron transport (Bastías et al 2004, Lu et al 2008, and the decline in the activity and content of Rubisco (Mudalige andLongstreth 2006, Lu et al 2009). However, there are still some debates on the relative contribution of stomatal and non-stomatal factors to the decline of photosynthesis under salinity.…”

Section: Introductionmentioning

confidence: 99%

Physiological responses to salinity in Silver buffaloberry (Shepherdia argentea) introduced to Qinghai high-cold and saline area, China

Qin¹,

Wang²,

He³

et al. 2010

Photosynt.

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Since 2002, Silver buffaloberry (Shepherdia argentea) has been introduced from North America in order to improve the fragile ecological environment in western China. To elucidate the salt-resistance mechanism of S. argentea, we conducted a test with two-year-old seedlings subjected to 0, 200, 400, and 600 mM NaCl solutions for 30 d. The results showed that significant salt-induced suppression of plant fresh mass (FM) and stem height of S. argentea seedlings occurred only at the highest salinity level (600 mM). Leaf number, plant dry mass (DM), and chlorophyll (Chl) content declined markedly at both 400 and 600 mM. Leaf area (LA) and leaf water potential (Ψ w ) continuously declined with the increase of salinity. There was also a progressive and evident decrease in net photosynthetic rate (P N ), transpiration rate (E), and stomatal conductance (g s ) with the increase of salinity and time. The correlation analysis indicated that P N was positively correlated with g s at all salinity levels while correlated with intercellular CO 2 concentration (C i ) only at moderate salinity levels (<600 mM). Based on the initial slope of the P N /C i curves, the estimated carboxylation efficiency (CE) was strongly inhibited at 600 mM. We confirm that S. argentea is highly tolerant to salinity. Moreover, our results show that at moderate salinity levels, salt-induced inhibition of photosynthesis is mainly attributed to the stomatal efficient closure predetermined by a low water potential in leaves; while at the high salinity levels, the inhibition is mainly due to the suppression of chloroplast capacity to fix CO 2 caused by the serious decline in both CE and Chl contents.Additional key words: growth; net photosynthetic rate; non-stomatal limitations; P N /C i curves; relative water content; stomatal limitations.

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“…During the last decade, several episodes of increasing salinities (3 to 8 g L −1 ) were recorded in this pond, which may have selected some ecotypes adapted to the changing environment, as it suggested by Kirkwood et al (2008). Common freshwater cyanobacterial species are able to tolerate salinity at low concentrations (Orr et al 2004; Laamanen et al 2001) and acclimate to salinity with time (Barron et al 2002) and locations (brackish areas-Bergmann et al 2008), unlike other phytoplankton groups ( i.e. eukaryotes-Moisander et al 2002).…”

Section: Discussionmentioning

confidence: 90%

“…The potential shift of their halotolerance threshold and ability to tolerate salt variations arise the question of their potential persistence in the downstream waters including estuarine and coastal areas after meteorological-drifting events (caused by strong rainfalls or floods) (De Pace et al 2014). It would be a serious issue since these cyanobacterial species are also toxin-producing cells and hence could contaminate the aquaculture and fisheries farms located along the freshwater-marine continuum (Bergmann et al 2008). Finally, it may be a crucial issue for water management strategies based on the increase and/or oscillations of salinity concentration in freshwater systems, as already implemented in several countries such as the Netherlands (Verspagen et al 2006).…”

Section: Discussionmentioning

confidence: 99%

Persistence of microcystin production ofPlanktothrix agardhiiexposed to different salinity concentrations

Vergalli

Combès

Franquet

et al. 2018

Preprint

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Recent reports tend to predict the increase of harmful cyanobacteria in water systems worldwide due to the climatic and environmental changes, which would compromise water quality and public health. Among abiotic changes, the higher salinities are expected to promote the growth of some harmful species such as Planktothrix agardhii, which is known to build up blooms in brackish areas. Since P. agardhii is a common cyanotoxin producer (microcystin-producing), we investigated here the growth and tolerance of this species when exposed in vitro to a range of salinity levels, while assessing its microcystins variation and production in batch cultures during a time-frame experiment of 18 days. The study revealed a salt acclimation of the brackish P. agardhii that still produced microcystins in salty cultures while maintaining its growth ability in low to medium salinities (ranged from 0 to 7.5 g L−1). For higher salinity concentrations (10 to 12.5 g L−1), microcystins were still detected, while significantly lower growth rates were obtained during the exponential growth phase. This suggests that moderate to high salt ranges do not inhibit the microcystins production of P. agardhii at least for several weeks. Finally, the predicted remediation perspectives in a context of environment salinization assumed by environmental policies may be insufficient to eradicate this potential toxic cyanobacteria, especially when this species is already dominant in the waterbodies.

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Salinity Tolerance of the Chlorophyll b-synthesizing Cyanobacterium Prochlorothrix hollandica Strain SAG 10.89

Cited by 10 publications

References 40 publications

Phototrophic microbes form endolithic biofilms in ikaite tufa columns (SW Greenland)

Phototrophic microbes form endolithic biofilms in ikaite tufa columns (SW Greenland)

Physiological responses to salinity in Silver buffaloberry (Shepherdia argentea) introduced to Qinghai high-cold and saline area, China

Persistence of microcystin production ofPlanktothrix agardhiiexposed to different salinity concentrations

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