检索结果-南通市图书馆

Arbuscular mycorrhizal fungi regulate plant mineral nutrient uptake and partitioning in iron ore tailings undergoing eco-engineered pedogenesis

在线全文

学校读者我要写书评

暂无评论

Pedosphere 2024年第2期34卷 385-398页

作者： Zhen LI songlin wu Yunjia LIU Qing YI Merinda HALL Narottam SAHA Junjian WANG Yuanfang HUANG Longbin HUANG College of Land Science and Technology China Agricultural UniversityBeijing 100193China Centre for Mined Land Rehabilitation Sustainable Minerals InstituteThe University of QueenslandBrisbaneQLD 4072Australia Guangdong Provincial Key Laboratory of Soil and Groundwater Pollution Control School of Environmental Science and EngineeringSouthern University of Science and TechnologyShenzhen 518055China

Excess available K and Fe in Fe ore tailings with organic matter amendment and water-deficiencies may restrain plant colonization and growth,which hinders the formation of eco-engineered soil from these tailings for sustainable and cost-effective mine site rehabilitation.Arbuscular mycorrhizal(AM)fungi are widely demonstrated to assist plant growth under various unfavorable environments.However,it is still unclear whether AM symbiosis in tailings amended with different types of plant biomass and under different water conditions could overcome the surplus K and Fe stress for plants in Fe ore tailings,and if so,by what mechanisms.Here,host plants(Sorghum sp.Hybrid cv.Silk),either colonized or noncolonized by the AM fungi(Glomus spp.),were cultivated in lucerne hay(LH,C:N ratio of 18)-or sugarcane mulch(SM,C:N ratio of 78)-amended Fe ore tailings under well-watered(55%water-holding capacity(WHC)of tailings)or water-deficient(30%WHC of tailings)conditions.Root mycorrhizal colonization,plant growth,and mineral elemental uptake and partitioning were examined.Results indicated that AM fungal colonization improved plant growth in tailings amended with plant biomass under water-deficient conditions.Arbuscular mycorrhizal fungal colonization enhanced plant mineral element uptake,especially P,both in the LH-and SM-amended tailings regardless of water condition.Additionally,AM symbiosis development restrained the translocation of excess elements(i.e.,K and Fe)from plant roots to shoots,thereby relieving their phytotoxicity.The AM fungal roles in P uptake and excess elemental partitioning were greater in LH-amended tailings than in SM-amended tailings.Water deficiency weakened AM fungal colonization and functions in terms of mineral element uptake and partitioning.These findings highlighted the vital role AM fungi played in regulating plant growth and nutrition status in Fe ore tailings technosol,providing an important basis for involvement of AM fungi in the eco-engineered pedogenesis of Fe ore tailings.

关键词： Fe stress fungal symbiosis K stress mine site rehabilitation mycorrhizal colonization plant biomass amendment plant nutrition water deficiency

Complicated target recognition by archaeal box C/D guide RNAs

在线全文

学校读者我要写书评

暂无评论

Science China Life Sciences 2023年

作者： Jiayin Wang songlin wu Keqiong Ye Key Laboratory of RNA Science and Engineering CAS Center for Excellence in Biomacromolecules Institute of Biophysics Chinese Academy of Sciences University of Chinese Academy of Sciences

Box C/D RNAs guide the site-specific formation of 2′-O-methylated nucleotides(Nm) of RNAs in eukaryotes and archaea. Although C/D RNAs have been profiled in several archaea, their targets have not been experimentally determined. Here, we mapped Nm in r RNAs, tRNAs, and abundant small RNAs(sRNAs) and profiled C/D RNAs in the crenarchaeon Sulfolobus islandicus. The targets of C/D RNAs were assigned by analysis of base-pairing interactions, in vitro modification assays, and gene deletion experiments, revealing a complicated landscape of C/D RNA-target interactions. C/D RNAs widely use dual antisense elements to target adjacent sites in rRNAs, enhancing modification at weakly bound sites. Two consecutive sites can be guided with the same antisense element upstream of box D or D′, a phenomenon known as doublespecificity that is exclusive to internal box D′ in eukaryotic C/D RNAs. Several C/D RNAs guide modification at a single non-canonical site.This study reveals the global landscape of RNA-guided 2′-O-methylation in an archaeon and unexpected targeting rules employed by C/D RNA.

关键词：

The molecular diversity of arbuscular mycorrhizal fungi in the arsenic mining impacted sites in Hunan Province of China

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

Journal of Environmental Sciences 2016年第1期28卷 110-118页

作者： Yuqing Sun Xin Zhang Zhaoxiang wu Yajun Hu songlin wu Baodong Chen State Key Laboratory of Urban and Regional Ecology Research Center for Eco-Environmental Sciences Chinese Academy of Sciences Beijing 100085 China University of Chinese Academy of Sciences Beijing 100049 China

Arbuscular mycorrhizal fungi（AMF） can establish a mutualistic association with most terrestrial plants even in heavy metal contaminated environments. It has been documented that high concentrations of toxic metals, such as arsenic（As） in soil could adversely affect the diversity and function of AMF. However, there are still gaps in understanding the community composition of AMF under long-term As contaminations. In the present study, six sampling sites with different As concentrations were selected in the Realgar mining area in Hunan Province of China. The AMF biodiversity in the rhizosphere soils of the dominant plant species was investigated by sequencing the nuclear small subunit ribosomal RNA（SSU rR NA） gene fragments using 454-pyrosequencing technique. A total of 11 AMF genera were identified,namely Rhizophagus, Glomus, Funneliformis, Acaulospora, Diversispora, Claroideoglomus, Scutellopora,Gigaspora, Ambispora, Praglomus, and Archaeospora, among which Glomus, Rhizophagus, and Claroideoglomus clarodeum were detected in all sampling sites, and Glomus was the dominant AMF genus in the Realgar mining area. Redundancy analysis indicated that soil pH, total As and Cd concentrations were the main factors influencing AMF community structure. There was a negative correlation between the AMF species richness and the total As concentration in the soil,but no significant correlation between the Shannon–Wiener index of the AMF and plants. Our study showed that high As concentrations can exert a selective effect on the AMF populations.

关键词： Arsenic pollution Arbuscular mycorrhizal fungi Biodiversity 454 pyrosequencing Heavy metal

SnoRNP is essential for thermospermine-mediated development in Arabidopsis thaliana

在线全文

学校读者我要写书评

暂无评论

Science China(Life Sciences) 2023年第1期66卷 2-11页

作者： Xilong Li Zongyun Yan Meiling Zhang Jiayin Wang Peiyong Xin Shujing Cheng Liquan Kou Xiaoting Zhang songlin wu Jinfang Chu Chengqi Yi Keqiong Ye Bing Wang Jiayang Li State Key Laboratory of Plant Genomics and National Center for Plant Gene Research(Beijing) Institute of Genetics and Developmental BiologyInnovation Academy for Seed DesignChinese Academy of SciencesBeijing 100101China State Key Laboratory of Protein and Plant Gene Research School of Life SciencesPeking UniversityBeijing 100871China Key Laboratory of RNA Biology CAS Center for Excellence in BiomacromoleculesInstitute of BiophysicsChinese Academy of SciencesBeijing 100101China University of Chinese Academy of Sciences Beijing 100039China Hainan Yazhou Bay Seed Laboratory Sanya 572025China

Polyamines have been discovered for hundreds of years and once considered as a class of phytohormones.Polyamines play critical roles in a range of developmental processes.However,the molecular mechanisms of polyamine signaling pathways remain poorly understood.Here,we measured the contents of main types of polyamines,and found that endogenous level of thermospermine(T-Spm)in Arabidopsis thaliana is comparable to those of classic phytohormones and is significantly lower than those of putrescine(Put),spermidine(Spd),and spermine(Spm).We further found a nodule-like structure around the junction area connecting the shoot and root of the T-Spm biosynthetic mutant acl5 and obtained more than 50 suppressors of acl5 nodule structure(san)through suppressor screening.An in-depth study of two san suppressors revealed that NAP57 and NOP56,core components of box H/ACA and C/D snoRNPs,were essential for T-Spm-mediated nodule-like structure formation and plant height.Furthermore,analyses of rRNA modifications showed that the overall levels of pseudouridylation and 2′-O-methylation were compromised in san1 and san2 respectively.Taken together,these results establish a strong genetic relationship between rRNA modification and T-Spm-mediated growth and development,which was previously undiscovered in all organisms.

关键词： polyamines thermospermine snoRNP pseudouridylation 2’-O-methylation Arabidopsis thaliana

Rhizophagus irregularis influences As and P uptake by alfafa and the neighboring non-host pepperweed growing in an As-contaminated soil

在线全文

学校读者我要写书评

暂无评论

Journal of Environmental Sciences 2018年第5期30卷 36-44页

作者： Xin Zhang Baihui Ren songlin wu Yuqing Sun Baodong Chen Ruojuan Li State Key Laboratory of Urban and Regional Ecology Research Center for Eco-Environmental SciencesChinese Academy of SciencesBeijing 100085China Yunnan Forestry Technological College Kunming 650224China

It was documented that arbuscular mycorrhiza fungi（AMF） play an important role in protecting host plants against arsenic（As） contamination. However, most terrestrial ecosystems contain a considerable number of nonmycorrhizal plants. So far little information is available for the interaction of such non-host plants with AMF under As contaminations. By using a dual compartment cultivation system with a plastic board or a nylon mesh separating roots of non-host pepperweed from roots of the AM-host alfafa plants, avoiding direct root competition, the two plant species were grown separately or partially separated（with rhizosphere effects） in the presence or absence of the AMF Rhizophagus irregularis in As-contaminated soil. The results indicated that mycorrhiza caused phosphorus（P） concentration decrease in the non-host pepperweed, but promoted the P concentration of the AM host alfafa. Mycorrhiza is potentially helpful for non-host pepperweed to adapt to As contamination by decreasing root As concentration and showing no suppressing effect on biomass production. The study provides further evidence for the protective effects of AMF on non-host plants against As contamination, and improved our understanding of the potential role of AMF for non-host plant adaptation to As contaminated soils.

关键词： AM fungi Arsenic contamination Non-host plant Interaction

Growth and metal uptake of energy sugarcane (Saccharum spp.) in different metal mine tailings with soil amendments

在线全文

学校读者我要写书评

暂无评论

Journal of Environmental Sciences 2014年第5期26卷 1080-1089页

作者： Xin Zhang Yongguan Zhu Yuebin Zhang Yunxia Liu Shaochun Liu Jiawen Guo Rudan Li songlin wu Baodong Chen State key Laboratory of Urban and Regional Ecology Research Center for Eco-Environmental SciencesChinese Academy of Sciences Key Lab of Urban Environment and Health Institute of Urban EnvironmentChinese Academy of Sciences Sugarcane Research Institute Yunnan Academy of Agricultural Sciences

A pot experiment was conducted to investigate the feasibility of growing energy sugarcane （Sac- charum spp.） in three different metal mine railings （Cu, Sn and Pb/Zn tailings） amended with uncontaminated soil at different mixing ratios. The results indicated that sugarcane was highly tolerant to tailing environments. Amendments of 20% soil to Sn tailings and 30% soil to Cu tailings could increase the biomass of cane-stem for use as the raw material for bioethanol production. Heavy metals were mostly retained in roots, which indicated that sugarcane was useful for the stabilization of the tailings. Bagasse and juice, as the most valuable parts to produce bioethanol, only accounted for 0.6%- 3% and 0.6%-7% of the total metal content. Our study supported the potential use of sugarcane for tailing phytostabilization and bioenergy production.

关键词： bioenergy crop sugarcane metal mine tailings phytoremediation

“主体-演变-结构”视角下生态环境冲突的处置机制研究

在线全文

学校读者我要写书评

暂无评论

郑州大学学报（哲学社会科学版） 2024年第2期57卷 18-24,142页

作者：高卫星吴松霖李志刚郑州大学政治与公共管理学院河南郑州450001

社会转型背景下生态环境冲突频发已成为影响经济发展与社会稳定的重要因素,如何有效预防并妥善处置这些冲突是当前我国社会治理亟待解决的重要命题。基于“主体-演变-结构”三个视角,通过构建生态环境冲突的处置机制体系,包含协同参与... 详细信息

社会转型背景下生态环境冲突频发已成为影响经济发展与社会稳定的重要因素,如何有效预防并妥善处置这些冲突是当前我国社会治理亟待解决的重要命题。基于“主体-演变-结构”三个视角,通过构建生态环境冲突的处置机制体系,包含协同参与机制、事前预防机制、事中解决机制、善后处理机制、利益协调机制、舆情引导机制、监督约束机制、应急保障机制等8个处置机制,并通过筛选出不同发生地域和诱发原因的30个生态环境冲突典型案例,以及对该处置机制体系进行验证,发现:生态环境冲突的8个处置机制与事件解决结果的相关性分析都为正,说明处置机制可能有效影响了解决结果,处置机制符合程度越高的案例,其解决结果越成功。生态环境冲突发生地域和诱发原因对生态环境冲突处置机制与事件解决结果之间的关系具有影响效应,发生在城市地区的生态环境冲突处置机制与解决结果要优于发生在农村地区的,风险型生态环境冲突处置机制与解决结果要优于污染型。研究发现对生态环境冲突的处置机制构建与治理具有积极意义,也对其他类型冲突的治理具有借鉴和参考价值。

关键词：生态环境冲突协同参与利益协调全过程管理应急管理

维普期刊数据库博看期刊

Demagnetization Research on PMs in the Halbach Magnetized Pulsed Alternator

在线全文

学校读者我要写书评

暂无评论

CES Transactions on Electrical Machines and Systems 2019年第2期3卷 170-177页

作者： songlin wu Shaopeng wu Weiduo Zhao Shumei Cui Department of Electrical Engineering Harbin Institute of TechnologyHarbin 150080China International Academy of the Marine Economy and Technology University of NottinghamNingbo 315000China

Demagnetization behavior of Halbach magnetized compensated pulsed alternator(CPA)is studied by using finite element method(FEM)under the different demagnetization factors in this paper.The effect of armature reaction magnetic field and thermal rise on demagnetization of PMs is analyzed.This paper investigates the effect of different demagnetization factors on magnetic field distribution,load current,and no-load phase voltage.A series of dynamic demagnetization points in Halbach array permanent magnet(PM)are evaluated to search the worst working point.Partial demagnetization risk can be represented by the worst working point,and the global demagnetization of the PM is represented by the no-load phase voltage characteristics after discharge.The research results demonstrated that the compensation shield with a certain thickness can increase the discharge current and weaken the demagnetization influence of armature reaction.The demagnetization effect of armature reaction on PMs at high temperatures will be strengthened.

关键词： Armature reaction dynamic demagnetization finite element method(FEM) pulsed alternator thermal rise.

Arbuscular mycorrhiza and plant chromium tolerance

在线全文

学校读者我要写书评

暂无评论

Soil Ecology Letters 2019年第3期1卷 94-104页

作者： songlin wu Xin Zhang Longbin Huang Baodong Chen State Key Laboratory of Urban and Regional Ecology Research Center for Eco-Environmental SciencesChinese Academy of SciencesBeijing 100085China Environment Centres(CMLR) Sustainable Minerals InstituteThe University of QueenslandBrisbaneQueensland 4072Australia University of Chinese Academy of Sciences Beijing 100049China

Arbuscular mycorrhizal(AM)fungi are ubiquitous soil fungi that form symbiotic associations with most terrestrial plants.The growth and functions of AM fungi depend on carbohydrates supplied by the plants,in return,the fungi assist the plants to acquire mineral nutrients(e.g.,phosphorus)from soil.The AM symbiosis also improves plant survival in various unfavorable environments,such as metal(loid)contaminated soil.It has been well demonstrated that AM symbiosis improved plant adaptation to Cr contamination,which would have a great potential in phytoremediation and ecological restoration of Cr contaminated soils.In this paper,we have reviewed the role of AM fungi in alleviation of Cr phytotoxicity and associated factors influencing plant Cr tolerance.AM symbiosis improves plant Cr tolerance through its direct roles in Cr stabilization and transformation and indirect roles via AM symbiosis mediated nutrient acquisition and physiological regulation.Future research on physiological and molecular mechanisms underlying Cr behavior and detoxification in AM symbiosis,as well as potential use of AM fungi in ecological restoration and agriculture production in Cr contaminated soils were also proposed.

关键词： Arbuscular mycorrhizal fungi Heavy metal Chromium Tolerance Translocation and transformation Bioremediation