Effects of phosphorus availability and phosphorus utilization behavior of Microcystis aeruginosa on its adaptation capability to ultraviolet radiation

Ren, Lingxiao; Wang, Peifang; Chao, Wang; Paerl, Hans W.; Wang, Huiya

doi:10.1016/j.envpol.2019.113441

Cited by 24 publications

(18 citation statements)

References 54 publications

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“…Similarly, UV adaptation capability of M. aeruginosa in this study included decreasing UV-induced damages and increasing self-repair e ciency. Con rmed by the increase of intracellular ROS, the enhanced production of CAR and PC, and integrity of cells in SEM analysis in UV-A and UV-B treatments, UV radiation exerted oxidative stresses rather than direct lethal effects on M. aeruginosa in this study(Hessen et al 2010;Ren et al 2020). Since the up-regulation of CAR and PC could serve as the photoprotective compounds for cyanobacteria and enhance its light usage e ciency, and M. aeruginosa could increase SOD activity accordingly to scavenge ROS(Li et al 2017;Zhang et al 2013), M. aeruginosa resurrected its photosynthetic activity and continued to grow in varying degrees after withdrawing UV radiation in DOP-rich medium.…”

supporting

confidence: 53%

“…Our previous study has reported that exposure to ambient-intensity UV radiation had an inhibitory effect on the growth and photosynthesis of M. aeruginosa, but the in uences could be eliminated with high DIP availability (Ren et al 2020). The similar effects of UV radiation on M. aeruginosa emerged in DOP-rich waters, but the negative effects could be only eliminated with the addition of DOM.…”

Section: Effects Of Dop and Dom On Algal Uv Adaptation Capabilitymentioning

confidence: 99%

“…The composition of DOP-rich medium was identical to standard BG 11 medium except for replacing dipotassium phosphate with glucose-6-phosphate, which is a common form of DOP in the natural waters (Bai et al 2009; Table S1). Based on P concentrations in many aquatic ecosystems and our previous research (Ren et al 2020), a high level of DOP was adopted (2.5 mg L − 1 ) in DOP-rich medium. Then, DOM stock solution were added into half the petri dishes at a nal content of 5.0 mg TOC L − 1 , representing four experimental groups: without DOM in DOP-rich medium (NM-P group), with DOM in DOP-rich medium (M-P group), without DOM in DOP-free medium (NM-NP group), with DOM in DOP-free medium (M-NP group).…”

Section: Experimental Setup 221 Effects Of Irradiation On M Aeruginosamentioning

confidence: 99%

“…It was indicated that P availability could in uence the physiological processes and adaptation of cyanobacteria to environmental stresses (Shi et al 2003;Carrillo et al 2015). For example, higher dissolved inorganic P (DIP, mainly as phosphate) in water could enhance algal production of photosynthetic pigments and the antioxidase activity of UV-radiated M. aeruginosa, leading to a higher adaptation capability (Ren et al 2020). However, DIP shortage has become a common phenomenon in many systems and algae often produced alkaline phosphatase (APase) to hydrolyze dissolved organic P (DOP) for phosphate in the natural waters, which was an indirect process for algal P utilization (Ma et al 2019) and might result in different manners for the adaptation of cyanobacteria to UV radiation.…”

Section: Introductionmentioning

confidence: 99%

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Effects of Algal Utilization of Dissolved Organic Phosphorus by Microcystis Aeruginosa on its Adaptation Capability to Ambient Ultraviolet Radiation

Ren

Huang

Zhu

et al. 2021

Preprint

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Phosphorus (P) plays an important role in eutrophication and algal adaptation to environmental stresses; therefore, a better understanding of the impact of P is essential to control cyanobacterial bloom. In this study, Microcystis aeruginosa was treated with 5-h of ambient irradiation in the culture medium with different availability of dissolved organic P (DOP) and dissolved organic matter (DOM), to explore algal responses. Compared to photosynthetically active radiation (PAR), ambient UV-A and UV-B radiation exerted oxidative stresses and had inhibitive effects on the growth and photosynthesis of M. aeruginosa in DOP-rich medium. However, M. aeruginosa had a strong adaptation capability and the negative effects of UV radiation were eliminated with DOM addition (5 mg L− 1 humic acid [HA]). Combining dissolved inorganic P (DIP) and DOP contents in the culture medium, adaptation of M. aeruginosa to UV radiation in the DOP-rich waters could be mainly achieved through the hydrolysis of DOP and metabolism of DIP, and the DOP utilization behaviors of M. aeruginosa greatly affected its UV adaptation capability. In DOP-rich medium without DOM, APase inactivation after UV radiation negatively affected DOP utilization by M. aeruginosa, and algal P demand for UV adaptation could not be fully met. DOM could act as an antioxidant and greatly decreased APase inactivation after UV radiation, when M. aeruginosa utilized DOP faster to produce more DIP and to increase algal carotenoid, phycocyanin production and its superoxide dismutase (SOD) activity in the DOP-rich medium, resulting in a strong UV adaptation capability. Consequently, M. aeruginosa showed the lowest adaptation capability to UV radiation in the DOP-free medium. Overall, our findings indicated the close relationship of algal DOP utilization and its adaptation to ambient UV radiation of typical cyanobacteria in DIP-limited and DOP-enriched natural waters.

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supporting

confidence: 53%

Section: Effects Of Dop and Dom On Algal Uv Adaptation Capabilitymentioning

confidence: 99%

Section: Experimental Setup 221 Effects Of Irradiation On M Aeruginosamentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Effects of Algal Utilization of Dissolved Organic Phosphorus by Microcystis Aeruginosa on its Adaptation Capability to Ambient Ultraviolet Radiation

Ren

Huang

Zhu

et al. 2021

Preprint

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“…Other studies have examined the interactive effects of UV radiation and nutrient availability on toxic cyanobacteria, which cause harmful algal blooms in freshwater environments. When a toxic strain of Microcystis aeruginosa was grown with large amounts of phosphorus, as would occur in a nutrient-rich lake, photosynthesis and growth were little affected by UV radiation compared to the moderate or severe inhibition observed under low or depleted phosphorous conditions, respectively [ 202 ]. In addition, short-term inhibition of photosynthesis occurs in the toxic strain of M. aeruginosa under UV irradiation but it recovers rapidly.…”

Section: The Adverse Effects Of Uv Radiation and The Defences Against...mentioning

confidence: 99%

The response of aquatic ecosystems to the interactive effects of stratospheric ozone depletion, UV radiation, and climate change

Neale

Williamson

Banaszak

et al. 2023

Photochem Photobiol Sci

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Variations in stratospheric ozone and changes in the aquatic environment by climate change and human activity are modifying the exposure of aquatic ecosystems to UV radiation. These shifts in exposure have consequences for the distributions of species, biogeochemical cycles, and services provided by aquatic ecosystems. This Quadrennial Assessment presents the latest knowledge on the multi-faceted interactions between the effects of UV irradiation and climate change, and other anthropogenic activities, and how these conditions are changing aquatic ecosystems. Climate change results in variations in the depth of mixing, the thickness of ice cover, the duration of ice-free conditions and inputs of dissolved organic matter, all of which can either increase or decrease exposure to UV radiation. Anthropogenic activities release oil, UV filters in sunscreens, and microplastics into the aquatic environment that are then modified by UV radiation, frequently amplifying adverse effects on aquatic organisms and their environments. The impacts of these changes in combination with factors such as warming and ocean acidification are considered for aquatic micro-organisms, macroalgae, plants, and animals (floating, swimming, and attached). Minimising the disruptive consequences of these effects on critical services provided by the world’s rivers, lakes and oceans (freshwater supply, recreation, transport, and food security) will not only require continued adherence to the Montreal Protocol but also a wider inclusion of solar UV radiation and its effects in studies and/or models of aquatic ecosystems under conditions of the future global climate. Graphical abstract

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Processes and mechanisms of phosphorus mobility among sediment, water, and cyanobacteria under hydrodynamic conditions

Ren

Ding

et al. 2021

Environ Sci Pollut Res

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Phosphorus (P) has an important role in eutrophication and it is essential to explore the processes and mechanisms of P mobility in natural waters. In this study, laboratory experiments were conducted to simulate the SW system (sediment and water) and SAW system (sediment, algae and water) under four hydrodynamic intensity conditions (static control, 50 rpm, 125 rpm and 200 rpm treatments), to investigate P mobility. Results in SW system showed that, sediment was an important source of P for overlying water, and the released total P (TP) increased with stronger hydrodynamic intensity, when P associated with metal pools (redox-sensitive P [BD-P] and meta-oxides bound P [NaOH-P]) were the most unstable and easier to migrate into the overlying water. Stronger hydrodynamic disturbances could enhance the processes including sediment resuspension, dissolution of particles, and release of P, when P mobility had a close relationship with redox conditions near sediment-water interface (SWI). Therefore, the release of TP, BD-P and NaOH-P from sediment increased and decreased in the control and 50-200 rpm treatments over time. In SAW system, the release of TP signi cantly increased from sediment comparing to SW system, and the growth of Microcystis aeruginosa could selectively enhance the release of BD-P, NaOH-P, and organic P (OP). Meanwhile, the released P from sediment was quickly accumulated by algal cells. The maximum accumulation ability of P by cells, the highest photosynthetic e ciency and the best growth of M. aeruginosa were observed in 125 rpm treatment. But with excessively strong hydrodynamic intensity (200 rpm treatment), the accumulation ability of P and alkaline phosphatase activity (APA) of M. aeruginosa was suppressed, which might hinder algal utilization of P and inhibit algal growth. Overall, our ndings demonstrated the patterns of P mobility in natural ecosystems and could contribute to the understanding of P cycling.

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Effects of phosphorus availability and phosphorus utilization behavior of Microcystis aeruginosa on its adaptation capability to ultraviolet radiation

Cited by 24 publications

References 54 publications

Effects of Algal Utilization of Dissolved Organic Phosphorus by Microcystis Aeruginosa on its Adaptation Capability to Ambient Ultraviolet Radiation

Effects of Algal Utilization of Dissolved Organic Phosphorus by Microcystis Aeruginosa on its Adaptation Capability to Ambient Ultraviolet Radiation

The response of aquatic ecosystems to the interactive effects of stratospheric ozone depletion, UV radiation, and climate change

Processes and mechanisms of phosphorus mobility among sediment, water, and cyanobacteria under hydrodynamic conditions

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