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Physiological and molecular responses of invasive cyanobacterium raphidiopsis raciborskii to ambient phosphorus deficiency

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Journal of Oceanology and Limnology 2022年第5期40卷 1792-1803页

作者： Junqiong SHI Shuhan HE Lu ZHAO Lulu JI Songqi YANG Zhongxing WU Key Laboratory of Eco-environments in Three Gorges Reservoir Region(Ministry of Education) Chongqing Key Laboratory of Plant Ecology and Resources Research in Three Gorges Reservoir RegionSchool of Life SciencesSouthwest UniversityChongqing 400715China

raphidiopsis raciborskii can cause harmful cyanobacterial blooms when concentrations of environme ntal pho sphorus(P)are very low,thus the physiological and molecular mechanisms involved in the acclimation to P need to be characterized *** growth,chlorophyll fluorescence,alkaline phosphatase,and expression of genes directly involved in P assimilation were compared in the *** FACHB1496 strain grown with and without inorganic *** specific growth rate(μ),Chl a,and six fluorescence parameters(minimal fluorescence(F),maximal fluorescence(F),maximal variable fluorescence(F),electron transport flux(further than QA)per RC(ET/RC),quantum yield of the electron transport in PSⅡ(?),and the probability that an electron from a trapped exciton is moved into the electron transport chain beyond Q~-(Ψ))markedly decreased in *** in response to experimental *** contrast,the relative variable fluorescence at the J-step(V),trapped energy flux(leading to QA reduction)per RC(TR/RC),and alkaline phosphatase activity significantly *** addition,gene expressions involved in the alkaline phosphatase(phoAl and phoA2),high-affinity inorganic P transporter(pstSl),phosphonate transporter and metabolism(phnD and phnM),and nucleotidase(nucH)were significantly upregulated under P ***,physiological and molecular responses were resumed rapidly after P re-supplementation following P-deficient *** results highlight that *** can perform coordinated and complex cellular and physiological responses to cope with P deficiency,reflecting ***’s multi-faceted machinery to respond to environmental P fluctuations.

关键词： phosphorus deficiency raphidiopsis raciborskii gene expression chlorophyll fluorescence alkaline phosphatase

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Competitiveness of alga Microcystis aeruginosa co-cultivated with cyanobacterium raphidiopsis raciborskii confirms its dominating position

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Journal of Oceanology and Limnology 2022年第5期40卷 1804-1818页

作者： Zengling MA Xiaoqiao ZHANG Renhui LI Min WANG Wenli QIN He ZHANG Gang LI Henguo YU Chuanjun DAI Min ZHAO Zhejiang Provincial Key Laboratory for Subtropical Water Environment and Marine Biological Resources Protection Wenzhou UniversityWenzhou 325035China National and Local Joint Engineering Research Center of Ecological Treatment Technology for Urban Water Pollution Wenzhou UniversityWenzhou 325035China Key Laboratory of Tropical Marine Bio-resources and Ecology South China Sea Institute of OceanologyChinese Academy of SciencesGuangzhou 510301China

Microcystis aeruginosa has always been regarded as the main culprit of cyanobacterial blooms in ***,in recent years,raphidiopsis raciborskii has gradually replaced *** as the culprit of cyanobacterial blooms in some tropical and subtropical shallow *** reveal which one plays a more dominant role,interactions between cylindrospermospin(CYN)-producing *** and microcystins(MCs)-producing or non-MCs-producing *** strains were studied using bialgal cultures at different initial ratios of biomasses of the two species at 25℃.During the co-cultivation,the *** strains inhibited the growth and heterocyst formation of *** filaments,and thus occupied a dominant position during the co-cultivation regardless of the initial biomass ratios in the *** addition,the MCs-producing M aeruginosa strain contributed to a higher portion of the total biomass and exerted a stronger inhibitory effect on *** compared with the non-MCs-producing ***,the growth of both MCs-producing and non-MCs-producing *** strains was stimulated by *** in the co-cultures compared with *** monoculture,indicating that *** could outcompete *** if given enough time,enabling it to develop into the dominant species even in very low initial *** our best knowledge,this is the first report on the loss of heterocyst formation by a species of cyanobacteria that resulted from interactions between two different species of *** findings indicate that it is difficult for *** to replace the dominant position of *** under the experimental environmental condition,and the allelopathic effects of *** on *** could significantly contribute to the success of ***.

关键词： competition growth heterocyst Microcystis aeruginosa morphology raphidiopsis raciborskii

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Overview of the distribution and adaptation of a bloom-forming cyanobacterium raphidiopsis raciborskii:integrating genomics,toxicity,and ecophysiology

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Journal of Oceanology and Limnology 2022年第5期40卷 1774-1791页

作者： Zhongxing WU Songqi YANG Junqiong SHI Key Laboratory of Eco-environments in Three Gorges Reservoir Region(Ministry of Education) Chongqing Key Laboratory of Plant Ecology and Resources Research in Three Gorges Reservoir RegionSchool of Life SciencesSouthwest UniversityChongqing 400715China

raphidiopsis raciborskii is a notorious bloom-forming and filamentous cyanobacterium that has been extensively investigated into its toxicity,phylogeny,and spreading *** have demonstrated that this species has spanned different climates from tropical zones to temperate regions,suggesting that *** is becoming a cosmopolitan species in freshwater systems around the *** fact,it has been proposed that several characteristics of *** may explain its spread and *** particular,*** is known to display a high extent of physiological plasticity regarding nutrients,light regimes,and te mperature ***,this species illustrates different ecotype s with distinct environmental ***,we present an overview of ***’s global distribution and adaptation strategy based on the recent findings from genome variance,toxicity,and *** expansion of its geographical distribution can be linked to its genome,toxicity,and *** variable genes are mainly associated with the stress response,phage defense,DNA repair,cell cycle control,and membrane transport,illustrating the species’adaptability in response to changing *** fact,the species shows rapid adaptability to low and/or variable nutrient availability,especially changing phosphorus ***,the variabilities of strains within the population extend their flexibility to adapt and acclimate to ambient *** addition,cylindrospermopsins(CYN)appear to have a potential biological role in facilitating theirs dominance or *** strategies of *** make it a challenge to manage in a fre shwater system,reflecting the management of its bloom from further evidence of the complex ecophysiology,toxicity,and genome of this species.

关键词： distribution ecophysiology genome variance raphidiopsis raciborskii toxicity

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