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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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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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Positive contribution of shoot apex to the growth and flooding tolerance of Hemarthria altissima upon complete submergence

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Journal of plant ecology 2024年第5期17卷 217-227页

作者： Hangang Niu Qiaoli Ayi Jiaojiao Xie Yujie Zhao Xian Luo Xiangzheng Liu Ting Wang Feng Lin Bo Zeng key laboratory of Eco-environments in three gorges reservoir region(Ministry of Education) Chongqing Key Laboratory of Plant Ecology and Resources in Three Gorges Reservoir RegionSchool of Life SciencesSouthwest UniversityChongqing 400715China

Flooding events tend to destroy the original flood-intolerant vegetation in riparian zones,but the flood-tolerant species can confront the stress,and contribute to the riparian *** species,Hemarthria altissima,are usually dominant in the riparian *** species is considered as good forage which is usually grazed by livestock or mowed by local ***,the apical tissues of the plants are often removed,and the plants have to grow without stem apexes,during their life *** this study,we aimed to examine the differences in growth performance of intact versus apex-cut individuals of *** upon complete *** groups of *** plants(with and without shoot apexes)were treated with dark non-submergence and dark complete submergence conditions for 200 *** the experiment,we measured plant growth,biomass changes in plant organs,and the consumption of non-structural carbohydrates(NSC)by different *** submergence,shoot elongation stopped,and around six lateral buds were developed averagely by each plant without *** growth performance finally caused 60%decline of NSC in underground *** relatively intensive consumption of carbohydrates in submerged apex-removed plants induced the 21%stem length decreased under water,which indicated the decreasing submergence tolerance of plants with shoot apex ***,we suggest that when using *** for restoring degraded riparian ecosystems,the shoot apexes should be protected from grazing by livestock or harvesting by local people in order to maintain the submergence tolerance of ***.

关键词： lateral buds non-structural carbohydrates(NSC) apical dominance submergence tolerance riparian vegetation restoration

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Driving forest succession in karst areas of chongqing municipality over the past decade

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Forest Ecosystems 2020年第1期7卷 26-36页

作者： Qiang Xiao Yang Xiao Yuan Liu Jianping Tao 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 chongqing University of Arts and Sciences Chongqing 402160China College of Biology and Environmental Sciences Jishou UniversityJishou 416000China

Background:Karst areas in southwestern China exhibit ecological degradation in the form of rocky *** governments launched large-scale afforestation and other ecological restoration programs to curb this *** thickness is a key limiting factor for vegetation restoration in Karst areas,but the relationship between ecological restoration and soil thickness remains ***,afforestation consumes large amounts of water,which impacts water supply in karst *** this study,we used GIS and statistical analyses to determine rocky desertification sensitivity and its driving factors in karst areas of chongqing municipality over the past ***:Soil thickness is one of the key factors that restrict ecological restoration of rocky *** 2000 to 2010,rocky desertification sensitivity in karst areas was on the rise along with an increase in *** of high sensitivity were mainly distributed in Pengshui County,Wulong District,and Youyang County;Shizhu County had the lowest overall incidence of *** distribution of rocky desertification was significantly affected by rainfall and soil *** analysis showed that the main factors controlling changes in rocky desertification in natural forest over time were precipitation which explained 23.73%of total variance,and soil thickness which explained 23.42%of total *** thickness and soil water content had a higher correlation coefficient(at 0.516)in natural forests than in planted ***:This study showed that increases in soil thickness in a karst area had a significant positive impact on the fragile ecological *** indicates that ecosystem restoration in karst areas will benefit from addressing soil thickness.

关键词： Rocky desertification GIS Karst areas Ecological restoration Ecological drivers

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Environmental heterogeneity and productivity drive the assemblage of benthic diatom:a case study of the three gorges reservoir

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Journal of Oceanology and Limnology 2023年第3期41卷 991-1006页

作者： Songqi YANG Tian OUYANG Shaojun XU Lu ZHAO Lulu JI Junqiong SHI 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 ScienceSouthwest UniversityChongqing 400715China Gansu Microalgae Technology Innovation Center Zhangye 734000China College of Horticulture and plant Protection Henan University of science and TechnologyLuoyang 471000China

Dam construction has a critical effect on river ecosystems in the world,resulting in a rapid decline in biodiversity and ecosystem ***,the effect of dam construction on the assemblage pattern of benthic diatoms remains *** benthic diatoms assemblages in the tributary backwater area of the three gorges reservoir(TGR)were investigated under low water level(LWL)and high water level(HWL)*** show that Discostella stelligera,Nitzschia palea,and Craticula subminuscula were dominant species in LWL,while Achnanthidium minutissimum and Nitzschia dissipata were dominant in ***,environmental variables,productivity parameters,diversity indices,and community similarity were found significantly different between LWL and HWL *** Mantel test indicated that both environmental and spatial factors had significant effects on diatom communities in backwater area,while productivity was also a key driving force in *** variation partitioning analysis(VPA)further demonstrated that environment factors could explain the largest variance of diatom assemblages in HWL(9%)and LWL(11%),followed by spatial *** relative importance of productivity to diatom community was significantly enhanced in LWL,but only a slight effect was found in *** results indicate that the diatom assemblages were shaped by both environmental filtering and spatial *** relative importance of spatial factors depended on the degree of ***,the homogenization of diatom communities due to environmental disturbance,*** and dam building,is the underlying mechanism in assembling the benthic diatoms.

关键词： three gorges reservoir benthic diatom assemblage environmental heterogeneity productivity

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Effect of wetland plant fermentation broth on nitrogen removal and bioenergy generation in constructed wetland-microbial fuel cells

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Frontiers of Environmental Science & Engineering 2022年第12期16卷 89-100页

作者： Yiting Chen Jun Yan Mengli Chen Fucheng Guo Tao Liu Yi Chen key laboratory of the three gorges reservoir region’s Eco-Environment(Ministry of Education) Chongqing UniversityChongqing400045China College of Environment and ecology Chongqing UniversityChongqing400045China

Constructed wetlands(CWs)are widely used as a tertiary treatment technology,and the addition of carbon sources can significantly improve advanced nitrogen ***,excessive carbon sources would lead to an increase in the effluent chemical oxygen demand in CWs,and microbial fuel cells(MFCs)can convert these into *** this study,constructed wetland-microbial fuel cells(CW-MFCs)were built to achieve simultaneous nitrogen removal and electricity generation,using wetland plant litter fermentation broths as carbon *** total nitrogen removal in the groups with fermentation broth addition(FGs)reached 83.33%,which was 19.64%higher than that in the CG(group without fermentation broth),and the mean voltages in the FGs were at least 2.6 times higher than that of the ***,two main components of the fermentation broths,acetic acid(Ac)and humic acid(HA),were identified using a three-dimensional excitation emission matrix and gas chromatograph and added to CW-MFCs to explore the influence mechanism on the treatment *** and electrogenesis presented the same tendency:Ac&HA>Ac>CG’(groups without Ac and HA).These results indicate that Ac and HA increased the abundance of functional genes associated with nitrogen metabolism and electron *** study demonstrated that CW-MFC fermentation broth addition can be a potential strategy for the disposal of secondary effluent and bioelectricity generation.

关键词： Constructed wetland Microbial fuel cell Nitrogen removal Bioenergy generation Carbon source

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Habitat fragmentation impacts on biodiversity of evergreen broadleaved forests in Jinyun Mountains,China

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Frontiers in Biology 2007年第1期2卷 62-68页

作者： YAN Ming ZHONG Zhangcheng LIU Jinchun School of Life Science Southwest China UniversityChongqing 400715China key laboratory of Eco-environments in three gorges reservoir region(MOE) Southwest China UniversityChongqing 400715China chongqing key laboratory of plant ecology and resources research in three gorges reservoir region Southwest China UniversityChongqing 400715China Institute of Biodiversity Shanxi Normal UniversityLinfen 041000China

The plant communities and their microclimates were surveyed and observed,and the soil fertilities were determined in six plots of evergreen broadleaved forests of different sizes and similar slope aspects on Jinyun Mountains of chongqing in China from April to October,*** relationships of biotic and abiotic factors were analyzed using the Simpson,Shannon-Wiener,and Hill diversity indices,and stepwise multilinear regression analyses *** results showed that compared with continuous evergreen broadleaved forests,five fragmentations had a lower species diversity index,and different life forms showed differences in diversity *** the decrease in patch areas,the daily differences in air temperature(ΔTa),ground surface temperature(ΔTs),daily differences in relative humidity(ΔRH),maximum wind velocity(Vmax),differences in photosynthetic available radiation(ΔPAR)(at noon)of both edges and interiors,all tended to *** wind velocity(Vmax)and photo effective radiation in forest edges were higher than those in interior forest,which presented a stronger temperature-gained edge *** all the fragmentations of evergreen broadleaved forests,the depth of the edge effect was the nearest from interior forest in the biggest patch(about 15 meters away from interior forest),while the depth of the edge effect was the farthest from interior forest in the smallest patch(about 25 meters away from interior forest).With regard to the water conservation function,soil water content improved along with increasing species *** of the nutritional function substances of soil increased with increasing species *** elements of microclimate,such as Ta,ΔTa,ΔTs,ΔRH,Vmax,and PAR,changed along with the extent of fragmented forest.

关键词： evergreen broadleaved forest edge effect frag-mentation microclimate biodiversity regression

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Effect of dissolved organic matter on mercury release from water body

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Journal of Environmental Sciences 2011年第6期23卷 912-917页

作者： Yutao Zhang Xi Chen Yongkui Yang Dingyong Wang Xiao Liu key laboratory of Eco-Environments in three gorges reservoir region (Ministry of Education) College of Resources and Environment Southwest University Chongqing 400715 China chongqing Engineering research Center for Agricultural-Non-Point Source Pollution Control in the three gorges reservoir Area Chongqing 400716 China Department of Chemistry Biology and Agriculture in Anshun College Anshun 561000 China

Dissolved organic matter（DOM） plays an important role in the process of mercury release from water *** this study,the influence of DOM from different sources（DOMR,DOMS and DOMH,extracted from rice straw,compost and humic soil respectively） on mercury reduction was *** molecular weight distribution and chemical composition of DOM from each source were determined using ultrafiltration membrane technique and elemental analysis *** result showed that mercury release from DOM-added samples was much lower than the control;the lowest mercury release flux was observed in the treatment of DOMH,25.02% of the control,followed by DOMS and DOMR,62.46% and 64.95% of the control,*** higher saturation degree and lower molecular weight of DOMH was responsible for the highest inhibition degree on the mercury *** link between DOMH,concentration and mercury flux was also estimated and the result showed that mercury flux was increased with DOMH at lower concentration,while decreased with DOMH at higher *** mechanism dominated the influence of DOM on mercury release with variation of DOM concentration.

关键词： dissolved organic matter mercury release inhibition molecular weight

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Different Responses of Sexual and Asexual Reproduction of Arundinella hirta to Flooding

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Frontiers in Biology 2006年第1期1卷 46-49页

作者： Zeng Bo Fu Tianfei Ulrich Schurr Arnd J.Kuhn School of Life Science Southwest China UniversityChongqing 400715China key laboratory of Eco-environments in three gorges reservoir region(MOE) Southwest China UniversityChongqing 400715China chongqing key laboratory of plant ecology and resources research in three gorges reservoir region Southwest China UniversityChongqing 400715China research Center of Juelich ICG Ⅲ(Phytosphere)52425 JuelichGermany

The sexual and asexual reproductive features of the graminoid species Arundinella hirta growing at riversides of the Jialing River were *** was found that the total seed mass,seed number per plant,and sexual reproductive allocation of *** decreased with decreasing bank elevation,and plants growing at the lowest elevations of banks subjected to intense flooding did not show sexual *** total plant biomass and the number of ramifications per plant increased with flooding intensity,which implies that,contrary to sexual reproduction,asexual reproduction of *** was enhanced by flooding.

关键词： Arundinella hirta asexual reproduction flooding reproductive allocation sexual reproduction

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Hematite-facilitated microbial ammoxidation for enhanced nitrogen removal in constructed wetlands

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Frontiers of Environmental Science & Engineering 2024年第7期18卷 35-45页

作者： Hao Qin Wenbo Nie Duo Yi Dongxu Yang Mengli Chen Tao Liu Yi Chen key laboratory of the three gorges reservoir region's Eco-Environment(Ministry of Education) Chongqing UniversityChongqing 400045China College of Environment and ecology Chongqing UniversityChongqing 400045China Faculty of Geosciences and Environmental Engineering Southwest Jiaotong UniversityChengdu 610031China

Constructed wetlands(CWs)are widely applied for decentralized wastewater ***,achieving efficient removal of ammonia(NH+-N)has proven challenging due to insufficient *** this study,natural hematite(Fe,O3)was employed as a CW substrate(H-CWs)for the first time to drive anaerobic ammonia oxidation coupled with iron(I)reduction(Feammox).Compared to gravel constructed wetlands(G-CWs),ammonia removal was enhanced by 38.14%to 54.03%and nitrous oxide(N_(2)0)emissions were reduced by 34.60%in *** synergistic removal of ammonia and nitrate by H-CWs also resulted in the absence of ammoxidation *** and 15N isotope tracer incubations showed that Feammox accounting for approximately 40%of all ammonia removal in the *** enrichment of iron phosphate(Fe_(3)Fe_(4)(PO_(4))_(6))promoted the accumulation of the Feammox intermediate compound *** nanowires were observed on the surface of H-CW substrates as well,suggesting that the observed biological ammoxidation was most likely related to extracellular electron transfer(EET).Microbial and metagenomics analysis revealed that H-CWs elevated the integrity and enhanced the abundance of functional microorganisms and genes associated with nitrogen ***,the efficient ammonia removal in the absence of O2 together with a reduction in N_(2)O emissions as described in this study may provide useful guidance for hematite-mediated anaerobic ammonia removal in CWs.

关键词： Constructed wetlands Nitrogen removal Feammox Hematite Iron cycle

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