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Journal of Integrative Plant Biology 2015年第7期57卷 653-660页

作者： Tingqiang Li Qi Tao Zhenzhen Di Fan Lu Xiaoe Yang Ministry of Education key laboratory of environmental remediation and ecological health College of Environmental and Resource SciencesZhejiang University

The combined effects of elevated CO2 and cadmi- um （Cd） on photosynthetic rate, chlorophyll fluorescence and Cd accumulation in hyperaccumulator Sedum alfredii Hance were investigated to predict plant growth under Cd stress with rising atmospheric CO2 concentration. Both pot and hydroponic experiments were conducted and the plants were grown under ambient （350 μL L^-1） or elevated （800μL L^-1） CO2. Elevated CO2 significantly （P 〈 0.05） increased Pn （105%- 149%）, Pnmax （38.8%-63.0%） and AQY （20.0%-34.8%） of S. alfredii in all the Cd treatments, but reduced chlorophyll concentra- tion, dark respiration and photorespiration. After lo days growth in medium with 50 μM Cd under elevated CO2, PSII activities were significantly enhanced （P 〈 0.05） with Pm, Fv/ Fm, φ（Ⅱ） and qP increased by 66.1%, 7.5%, 19.5% and 16.47o, respectively, as compared with ambient-grown plants. Total Cd uptake in shoot of S. alfredii grown under elevated CO2 wasincreased by 44.1%-48-5%, which was positively correlated with the increase in Pn. These results indicate that elevated CO2 promoted the growth of S. alfredii due to increased photosynthetic carbon uptake rate and photosynthetic light- use efficiency, and showed great potential to improve the phytoextraction of Cd by 5. alfredii.

关键词： Cadmium chlorophyll fluorescence elevated CO2 photosynthesis Sedum alfredii

Accumulation of mercury in rice grain and cabbage grown on representative Chinese soils

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Journal of Zhejiang University-Science B(Biomedicine & Biotechnology) 2013年第12期14卷 1144-1151页

作者： Chun-fa LIU Cheng-xian WU Muhammad T.RAFIQ Rukhsanda AZIZ Dan-di HOU Zhe-li DING Zi-wen LIN Lin-jun LOU Yuan-yuan FENG Ting-qiang LI Xiao-e YANG Ministry of Education key laboratory of environmental remediation and ecological health College of Environmental and Resource Sciences Zhejiang University

A pot culture experiment was carried out to investigate the accumulation properties of mercury(Hg) in rice grain and cabbage grown in seven soil types(Udic Ferrisols, Mollisol, Periudic Argosols, Latosol, Ustic Cambosols, Calcaric Regosols, and Stagnic Anthrosols) spiked with different concentrations of Hg(CK, 0.25, 0.50, 1.00, 2.00, and 4.00 mg/kg). The results of this study showed that Hg accumulation of plants was significantly affected by soil types. Hg concentration in both rice grain and cabbage increased with soil Hg concentrations, but this increase differed among the seven soils. The stepwise multiple regression analysis showed that pH, Mn(II), particle size distribution, and cation exchange capacity have a close relationship with Hg accumulation in plants, which suggested that physicochemical characteristics of soils can affect the Hg accumulation in rice grain and cabbage. Critical Hg concentrations in seven soils were identified for rice grain and cabbage based on the maximum safe level for daily intake of Hg, dietary habits of the population, and Hg accumulation in plants grown in different soil types. Soil Hg limits for rice grain in Udic Ferrisols, Mollisol, Periudic Argosols, Latosol, Ustic Cambosols, Calcaric Regosols, and Stagnic Anthrosols were 1.10, 2.00, 2.60, 2.78, 1.53, 0.63, and 2.17 mg/kg, respectively, and critical soil Hg levels for cabbage are 0.27, 1.35, 1.80, 1.70, 0.69, 1.68, and 2.60 mg/kg, respectively.

关键词： Mercury accumulation Soil safety Soil types Rice grain Cabbage Intake

Improved cadmium uptake and accumulation in the hyperaccumulator Sedum alfredii:the impact of citric acid and tartaric acid

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Journal of Zhejiang University-Science B(Biomedicine & Biotechnology) 2013年第2期14卷 106-114页

作者： Ling-li LU Sheng-ke TIAN Xiao-e YANG Hong-yun PENG Ting-qiang LI Ministry of Education key laboratory of environmental remediation and ecological health College of Environmental and Resource SciencesZhejiang University

The elucidation of a natural strategy for metal hyperaccumulation enables the rational design of technologies for the clean-up of metal-contaminated *** acid has been suggested to be involved in toxic metallic element tolerance,translocation,and accumulation in *** impact of exogenous organic acids on cadmium(Cd) uptake and translocation in the zinc(Zn)/Cd co-hyperaccumulator Sedum alfredii was investigated in the present *** the addition of organic acids,short-term(2 h) root uptake of 109 Cd increased significantly,and higher 109 Cd contents in roots and shoots were noted 24 h after uptake,when compared to *** 85% of the 109 Cd taken up was distributed to the shoots in plants with citric acid(CA) treatments,as compared with 75% within *** such effect was observed for tartaric acid(TA).Reduced growth under Cd stress was significantly alleviated by low ***-term application of the two organic acids both resulted in elevated Cd in plants,but the effects varied with exposure time and *** results imply that CA may be involved in the processes of Cd uptake,translocation and tolerance in ***,whereas the impact of TA is mainly on the root uptake of Cd.

关键词： Hyperaccumulation Cadmium Organic acid Sedum alfredii Translocation Uptake

Colonization of Penicillium oxalicum SL2 in Pb-contaminated paddy soil and its immobilization effect on soil Pb

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Journal of environmental Sciences 2022年第10期34卷 53-62页

作者： Yu Gao Xiaohan Jiang Hanxin Wu Jianhao Tong Xinyue Ren Jiayu Ren Qianhua Wu Jien Ye Chunhui Li Jiyan Shi Department of environmental Engineering College of Environmental and Resource ScienceZhejiang UniversityHangzhou 310058China moe key laboratory of environmental remediation and ecological health College of Environmental and Resource ScienceZhejiang UniversityHangzhou 310058China

Penicillium oxalicum SL2(SL2) is a previously screened Pb-tolerant fungus that can promote crops growth. The relationship between SL2 colonization and Pb immobilization was studied to provide a theoretical basis for microbial remediation of Pb-contaminated paddy *** this study, green fluorescent protein(GFP) labeled SL2 was inoculated into different Pbcontaminated paddy soils(S1-S6). The Pb extracted from the soil by HNO, EDTA and CaClwere used to characterize the available Pb. The results showed that the colonization of SL2was divided into lag phase(0-7 days), growth phase(7-30 days), and mortality phase(30-90days). SL2 colonized well in sandy soils rich in clay and total phosphorus with initial p H of 4.5-7.0. In addition, SL2 increased soil p H and decreased soil Eh, which was beneficial to immobilize Pb. In different soils, the highest percentages of CaCl-Pb, EDTA-Pb, and HNO3-Pb immobilized by SL2 were 34.34%-40.53%, 17.05%-20.11%, and 7.39%-15.62%, *** correlation analysis showed that the percentages of CaCl-Pb and EDTA-Pb immobilized by SL2 were significantly positively correlated with the number of SL2 during the growth phase. SL2 mainly immobilized Pb in the growth phase and a higher peak number of SL2 was beneficial to the immobilization of Pb.

关键词： Penicillium oxalicum SL2 Colonization Lead Availability Green fluorescent protein

Overlooked nitrogen-cycling microorganisms in biological wastewater treatment

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Frontiers of environmental Science & Engineering 2021年第6期15卷 187-199页

作者： Shaoyi Xu Xiaolong Wu Huijie Lu key laboratory of Environment remediation and ecological health(Ministry of Education) College of Environmental Resource SciencesZhejiang UniversityHangzhou 310058China

Nitrogen-cycling microorganisms play key roles at the intersection of microbiology and wastewater *** addition to the well-studied ammonia oxidizing bacteria,nitrite oxidizing bacteria,heterotrophic denitrifiers,and anammox bacteria,there are some other N-cycling microorganisms that are less abundant but functionally important in wastewater nitrogen *** microbes include,but not limited to ammonia oxidizing archaea(AOA),complete ammonia oxidation(comammox)bacteria,dissimilatory nitrate reduction to ammonia(DNRA)bacteria,and nitrate/nitrite-dependent anaerobic methane oxidizing(NO_(x)-DAMO)*** the past decade,the development of high-throughput molecular technologies has enabled the detection,quantification,and characterization of these minor *** aim of this review is therefore to synthesize the current knowledge on the distribution,ecological niche,and kinetic properties of these“overlooked”N-cycling microbes at wastewater treatment *** potential applications in novel wastewater nitrogen removal processes are also discussed.A comprehensive understanding of these overlooked N-cycling microbes from microbiology,ecology,and engineering perspectives will facilitate the design and operation of more efficient and sustainable biological nitrogen removal processes.

关键词： Ammonia oxidizing archaea(AOA) Complete ammonia oxidizing(comammox)bacteria Dissimilatory nitrate reduction to ammonium(DNRA)bacteria Nitrate/nitrite-dependent anaerobic methane oxidizing(NOx-DAMO)microorganisms Engineering application

Positive effects of applying endophytic bacteria in eggplant-Sedum intercropping system on Cd phytoremediation and vegetable production in cadmium polluted greenhouse

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Journal of environmental Sciences 2022年第5期34卷 383-391页

作者： Luyao Ma Lukuan Huang Qizhen Liu Shunan Xu Zheyu Wen Shuai Qin Tingqiang Li Ying Feng moe key laboratory of Environment remediation and ecological health College of Environmental and Resource SciencesZhejiang UniversityHangzhou 310058China Agriculture and Rural Bureau of Jinchengjiang District HechiGuangxi 547000China

The combination of intercropping and phytoremediation in the remediation of cadmium contaminated soil is an emerging model in recent years,but the results of previous studies are *** the field experiment,eggplant was intercropped with hyperaccumula-tor Sedum alfredii Hance(inoculated or not inoculated with endophytic bacteria)to study the effects of intercropping on vegetable safety production,phytoremediation efficiency of hyperaccumulator and variation of soil available *** results showed that the in-tercropping treatment had a negative effect on the growth of eggplant and Sedum,but en-dophyte SaMR12 alleviated the inhibition of intercropping on plant *** treatment increases the Cd concentration in edible part of eggplant to 1.34 mg/kg compared with eggplant monoculture(1.19 mg/kg).While the application of SaMR12 reduces the Cd concentration of eggplant fruit to 0.95 mg/kg and significantly promotes the Cd uptake by ***'s more surprising is that compared with eggplant monocropping,the con-tent of soil available nitrogen,phosphorus and potassium in the treatment of intercropping with inoculated Sedum increased *** according to the correlation analysis of various indexes of plants and soil,the Cd content of eggplant is negatively correlated with the available phosphorus and potassium in the soil,while the Cd content of Sedum is positively correlated with it,which suggested that the application of phosphorus and potas-sium fertilizers in this experimental site was beneficial to reduce Cd content in eggplant and improve Cd phytoextraction of ***,in the daily production of moderately Cd-contaminated soil,intercropping eggplant with Sedum inoculated with endophytic bacteria is an excellent Phytoextraction Coupled with Agro-safe-production(PCA)pattern.

关键词： Endophytic bacteria Solanum melongena L. Cd pollution Phytoremediation Soil fertility

Differential generation of hydrogen peroxide upon exposure to zinc and cadmium in the hyperaccumulating plant specie(Sedum alfredii Hance)

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Journal of Zhejiang University-Science B(Biomedicine & Biotechnology) 2008年第3期9卷 243-249页

作者： Yue-en CHAO Min ZHANG Sheng-ke TIAN Ling-li LU Xiao-e YANG moe key laboratory of environmental remediation and Ecosystem health College of Environmental and Resource Sciences Zhejiang University Hangzhou 310029 China

Sedum alfredii Hance has been identified as zinc(Zn) and cadmium(Cd) *** this paper the relationships of Zn or Cd hyperaccumulation to the generation and the role of H2O2 in Sedum alfredii *** *** results show that Zn and Cd contents in the shoots of Sedum alfredii *** with 1000 μmol/L Zn2+ and/or 200 μmol/L Cd2+ increased linearly within 15 *** of total S,glutathione(GSH) and H2O2 in shoots also increased within 15 d,and then *** S and GSH contents in shoots were higher under Cd2+ treatment than under Zn2+ ***,reverse trends of H2O2 content in shoots were obtained,in which much higher H2O2 content was observed in Zn2+-treated shoots than in Cd2+-treated ***,the microscopic imaging of H2O2 accumulation in leaves using H2O2 probe technique showed that much higher H2O2 accumulation was observed in the Zn2+-treated leaf than in the Cd2+-treated *** results suggest that there are different responses in the generation of H2O2 upon exposure to Zn2+ and Cd2+ for the hyperaccumulator Sedum alfredii *** this is the first report that the generation of H2O2 may play an important role in Zn hyperaccumulation in the *** results also imply that GSH may play an important role in the detoxification of dissociated Zn/Cd and the generation of H2O2.

关键词： Hydrogen peroxide (H2O2) Glutathione (GSH) Sedum alfredii Hance Zinc (Zn) Cadmium (Cd) Hyperaccumulator

Nitric oxide alleviates aluminum-induced oxidative damage through regulating the ascorbateglutathione cycle in roots of wheat

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Journal of Integrative Plant Biology 2015年第6期57卷 550-561页

作者： Chengliang Sun Lijuan Liu Yan Yu Wenjing Liu Lingli Lu Chongwei Jin Xianyong Lin moe key laboratory of Environment remediation and ecological health College of Natural Resource & Environmental SciencesZhejiang University key laboratory of Subtropical Soil Science and Plant Nutrition of Zhejiang Province College of Environmental and Resource SciencesZhejiang University

The possible association with nitric oxide （NO） and ascorbate-glutathione （AsA-GSH） cycle in regulating aluminum （Al） tolerance of wheat （Triticum aestivum L.） was investigated using two genotypes with different Al resistance. Exposure to Al inhibited root elongation, and triggered lipid peroxidation and oxidation of AsA to dehydroascorbate and GSH to glutathione disulfide in wheat roots. Exogenous NO significantly increased endogenous NO levels, and subsequently al eviated Al-induced inhibition of root elongation and oxidation of AsA and GSH to maintain the redox molecules in the reduced form in both wheat genotypes. Under Al stress, significantly increased activities and gene transcriptional levels of ascorbate peroxi-dase, glutathione reductase, and dehydroascorbate reductase, were observed in the root tips of the Al-tolerant genotype Jian-864. Nitric oxide application enhanced the activity and gene transcriptional level of these enzymes in both wheat geno-types. g-Glutamylcysteine synthetase was not significantly affected by Al or NO, but NO treatments increased the activity of glutathione peroxidase and glutathione S-transferase to a greater extent than the Al-treated wheat seedlings. Proline was significantly decreased by Al, while it was not affected by NO. These results clearly suggest that NO protects wheat root against Al-induced oxidative stress, possibly through its regulation of the AsA-GSH cycle.

关键词： Aluminum ascorbate glutathione nitric oxide reactive oxygen species wheat

ecological responses to substrates in electroactive biofilm:A review

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Science China(Technological Sciences) 2019年第10期62卷 1657-1669页

作者： YAN YuQing WANG Xin moe key laboratory of Pollution Processes and environmental Criteria Tianjin Key Laboratory of Environmental Remediation and Pollution Control College of Environmental Science and Engineering Nankai University

Substrate as the electron donor of bioelectrochemical system(BES) has fateful impacts on the microbial community composition of electroactive biofilm(EAB), via the selection upon functional microorganisms such as exoelectrogens, fermenters and methanogens, as well as their interactions. Electrochemical performance as the terminal reflects of electroactivity and the correspondence between community members have been summarized. Exoelectrogens responsible to the conversion towards electricity from their respective preferred substrates such as acetate, propionate, glucose and cellulose has been found to be finite in a small range, e.g., Geobacter, Shewanella and Pseudomonas. Their demands of micromolecular electron donors and the selective pressure of primary substrates facilitate the existence of competitive or cooperative biological processes to exoelectrogenesis. The inherent mechanisms of the dynamics of such interactions have been explored with electrochemical methods,defined co-culture experiments and community analysis. Complete view of the metabolic network in electroactive microbial communities has been shed light on, and appeals further investigation.

关键词： substrates electroactive biofilm bioelectrochemical systems fermentation methanogenesis

House dust mite allergens and nitrated products: Identification and risk assessment in indoor dust

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Journal of environmental Sciences 2023年第2期124卷 198-204页

作者： Fan Xu Jingyi Tian Fangxing Yang key laboratory of Environment remediation and ecological health Ministry of EducationCollege of Natural Resources and Environmental ScienceZhejiang UniversityHangzhou 310058China

Air pollutants can potentially lead to nitration of allergic proteins,thus promoting sensitization of these ***,little is currently known about the nitration status of house dust mite(HDM)*** identified the occurrence of nitrated products of two major HDM allergens Der f 1 and Der p 1 in dust samples collected from college dormitories in eastern China and assessed their associated health *** results showed that both non-nitrated and nitrated forms of the two allergens were detected in the dust in the range of non-detected(ND)-10.6,1.44-15.4,ND-22.4,ND-7.28μg/g for non-nitrated Der f 1,nitrated Der f 1,non-nitrated Der p 1 and nitrated Der p 1,*** median rates of nitration were determined as 74.0%for Der f 1 and 20.4% for Der p 1 at consideration of one nitration *** analysis reveals that the levels of HDM allergens and their nitrated products were found to be generally higher during winter,in dormitories of lower altitude and with female ***,the calculated risk indexes were at considerably high *** findings suggest that nitrated HDM allergens have already accumulated in the environment at such significant levels and their associated health risk calls for our immediate attention.

关键词： Allergen Air pollution health risk House dust mite(HDM) Nitration