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Phytoremediation of heavy metal

Hossein Hammami, Ebrahim Alaie, Seyed Mohammad Mehdi Dastgheib
Phytoremediation is a new ecological and cost-effective technology applied for cleaning heavy metals and total petroleum hydrocarbon contaminated (TPH-contaminated) soils. This study was conducted to evaluate the potential of milk thistle (Silybum marianum) to phytoremediate cadmium (Cd (II)) from contaminated soils. To this end, the investigators applied a completely randomized design with the factorial arrangement and four replications. The results indicated that all the evaluated parameters of S. Marianum, including shoot and root fresh and dry weight, as well as shoot and root Cd, were significantly influenced by Cd (II) concentration and diesel oil (DO)...
July 3, 2018: International Journal of Phytoremediation
Nasreen Jeelani, Wen Yang, Yajun Qiao, Jingjing Li, Shuqing An, Xin Leng
Soil contamination with heavy metals and organic pollutants continues to cause major ecological damage and human health problems. Phytoremediation offers a highly promising technology for the recovery of sites contaminated with mixed pollutants. In this study, we performed a greenhouse experiment to investigate the individual and combined effects of cadmium (Cd) and polycyclic aromatic hydrocarbon (PAH) contamination on the growth of Xanthium sibiricum, and also the ability of this species to accumulate and remove Cd and to reduce PAHs over a period of 75 days...
July 3, 2018: International Journal of Phytoremediation
Hao Zhang, Yana Ding, Junkai Zhi, Xiaoyu Li, Huabo Liu, Jichen Xu
As important cell wall proteins in plants, expansins are involved in a serious of abiotic stress resistance such as drought, heat, salt, even heavy metals. To understand the role of expansins in cadmium (Cd) stress, we analyzed the expression patterns of 36 expansin genes in Populus tomentosa. A Cd-induced expansin gene, PtoEXPA12, was identified, cloned, and transformed into tobacco plants. After treatment with Cd, the transgenic plants showed stronger symptoms of Cd toxicity as to the wild-type tobacco plants...
May 11, 2018: International Journal of Biological Macromolecules
Yini Cao, Ying Zhang, Chuanxin Ma, Haimei Li, Jianfeng Zhang, Guangcai Chen
Selecting plant species, especially woody species, that can tolerate and accumulate high levels of heavy metals is crucial for the purpose of phytoremediation. In the present study, seven willow species/clones were evaluated for their variations in copper (Cu) tolerance, Cu accumulation, and their relative physiological responses, when exposed to different doses of Cu (control, 15, and 120 μM) in a hydroponic system for 40 days. Upon Cu exposure, all tested willow species/clones (Salix, S.) remained relative normal growth, albeit with some visual evidence of Cu toxicity observed...
May 8, 2018: Environmental Science and Pollution Research International
Monika Kofroňová, Petra Mašková, Helena Lipavská
This review provides insights into As toxicity in plants with focus on photosynthesis and sugar metabolism as important arsenic targets and simultaneously defence tools against accompanying oxidative stress. Heavy metal contamination is a great problem all over the world. Arsenic, a metalloid occurring naturally in the Earth's crust, also massively spreads out in the environment by human activities. Its accumulation in crops poses a severe health risk to humans and animals. Besides the restriction of human-caused contamination, there are two basic ways how to cope with the problem: first, to limit arsenic accumulation in harvestable parts of the crops; second, to make use of some arsenic hyperaccumulating plants for phytoremediation of contaminated soils and waters...
May 7, 2018: Planta
A K Nayak, S S Panda, A Basu, N K Dhal
Bioremediation of Cr (VI), Fe, and other heavy metals (HMs) through plant-microbes interaction is one of the efficient strategies due to its high efficiency, low cost, and ecofriendly nature. The aim of the study was to isolate, characterize, and assess the potential of rhizospheric bacteria to enhance growth and metal accumulation by the chromium hyperaccumulator Vetiveria zizanoides. The bacterial strain isolated from mine tailings was identified to be Bacillus cereus (T1B3) strain exhibited plant growth-promoting traits including, 1-aminocyclopropane-1-carboxylate deaminase, indole acetic acid, and siderophores production, nitrogen fixation, and P solubilization...
June 7, 2018: International Journal of Phytoremediation
Xiaowei Zhang, Bin Zhong, Mohammad Shafi, Jia Guo, Chen Liu, Hua Guo, Danli Peng, Ying Wang, Dan Liu
The effect of EDTA and citric acid on accumulation, toxicity of heavy metals (Cu, Zn, Cd, and Pb), and growth of Moso bamboo was investigated in current experiment. The availability of heavy metals in soil and its uptake by plants has indicated toxicity. The results revealed that EDTA and citric acid has reduced biomass of Moso bamboo but non-significant difference in biomass was observed compared with control. Application of EDTA (10 mmol kg-1 ) has significantly improved copper (Cu) by 56.5 and 84.9% in roots and above ground parts of plants...
April 30, 2018: Environmental Science and Pollution Research International
Xian Duo Zhang, Kai Xuan Zhao, Zhi Min Yang
The plant ATP binding cassette (ABC) transporters are one of the integral membrane proteins responsible for uptake and allocation of a wide range of metabolites and xenobiotics including heavy metals (e.g. zinc, manganese and cadmium). They play multiple roles in plant growth, development and environmental stress responses. Although the ABC transporters have been identified in model plants such as Arabidopsis and rice, they are have not been annotated and identified in rapeseed (Brassica napus) and also, little is known about functionality of these metal transporters...
April 27, 2018: Gene
Jie Zhang, Shiyong Yang, Hongfei Yang, Yongjie Huang, Liming Zheng, Jing Yuan, Shoubiao Zhou
Four gramineous energy plants, Miscanthus sacchariflorus, M. floridulus, Phragmites australis, and Arundo donax were grown on copper tailings in the field for four years. Their phytoremediation potential was examined in terms of their effects on the fractions of heavy metals and soil enzyme activities. Results showed that plantation of these four gramineous plants has improved the proportion of organic material (OM)-binding fraction of heavy metals in copper tailings as a whole, and reduced the proportion of exchangeable and residual fractions...
May 12, 2018: International Journal of Phytoremediation
Ying Li, Jiewen Luo, Jiaoda Yu, Lidan Xia, Chuifan Zhou, Liping Cai, Xiangqing Ma
Slow plant growth, low biomass, and low bioavailability of heavy metals in soil are important factors that limit remediation efficiencies. This study adopted a pot cultivation method to evaluate the phytoremediation efficiency of Neyraudia reynaudiana, planted in contaminated soil from a lead-zinc mining area. The soil was inoculated with earthworms (Eisenia fetida), and mixed with the chelating agent ethylenediaminetetraacetic acid (EDTA) one month after planting. The addition of earthworms significantly increased the aboveground biomass of N...
April 23, 2018: Scientific Reports
Hai Lin, Junfei Liu, Yingbo Dong, Kaiqiang Ren, Yu Zhang
The aim of the present study was to investigate three kinds of emergent macrophytes, i.e., Acorus calamus L., Phragmites communis Trin., and Alternanthera philoxeroides (Mart.) Griseb and their combination patterns on their removal efficiency of compound heavy metals (vanadium, chromium, and cadmium) from synthetic aqueous. The results showed that the optimal single-species for compound heavy metals removal was Acorus calamus L. and during experiment period, the average removal efficiency of V5+ , Cr6+ , and Cd2+ was 52...
April 20, 2018: Environmental Science and Pollution Research International
Shuang-Shuang Chen, Jing Jiang, Xiao-Jiao Han, Yun-Xing Zhang, Ren-Ying Zhuo
Sedum alfredii Hance, a cadmium (Cd)/zinc (Zn)/lead (Pb) co-hyperaccumulating species, is a promising phytoremediation candidate because it accumulates substantial amounts of heavy metal ions without showing any obvious signs of poisoning. The heat shock transcription factor (Hsf) family plays crucial roles in plant growth, development, and stress responses. Although the roles of some Hsfs in abiotic stress have been well studied in model plants, the Hsf family has not been systematically investigated in heavy metal hyperaccumulators...
April 17, 2018: International Journal of Molecular Sciences
Marta Jaskulak, Agnieszka Rorat, Anna Grobelak, Małgorzata Kacprzak
The aim of the study was to evaluate sensitivity and potential applications of selected biomarkers in phytoremediation under complex heavy metal contamination in Sinapis alba L., Robinia pseudoacacia L. and Lupinus luteus L as a potential tools in effective phytoremediation management. The toxicity assessment was conducted using selected measurement endpoints, both classical and advanced, i.e., germination index, roots length, guaiacol peroxidase activity (GPX), chlorophyll and protein content, the amount of total phenolic compounds (TPC) and level of expression of one of the ribulose-bisphosphate carboxylase genes (rbcL)...
April 14, 2018: Journal of Environmental Management
Z Yousefi, M Kolahi, A Majd, P Jonoubi
Cadmium is an important environmental pollutant which genetically, physiologically and biochemically affects the cell. Phytochelatins (PC) are involved in one of the phytoremediation mechanisms, in which they are able to bind heavy metals, such as cadmium. The objective of this study was to evaluate morphometric, antioxidant enzyme activity, and SoPCS gene expression in sugarcane growing under cadmium stress. After propagation, samples were cultured in triplicate for 14 days in modified MS medium containing CdCl2 (100, 250, 500 µmol)...
April 12, 2018: Ecotoxicology and Environmental Safety
Qi Chen, Xueyan Lu, Xiaorui Guo, Yajie Pan, Bofan Yu, Zhonghua Tang, Qingxi Guo
Cd(II) is one of the most widespread and toxic heavy metals and seriously threatens plant growth, furthermore negatively affecting human health. For survival from this metal stress, plants always fight with Cd(II) toxicity by themselves or using other external factors. The effects of second metals copper (Cu(II)), zinc (Zn(II)) and calcium (Ca(II)) on the Cd(II)-affected root morphology, Cd(II) translocation and metabolic responses in Catharanthus roseus were investigated under hydroponic conditions. We found that the Cd-stressed plants displayed the browning and rot root symptom, excess H2 O2 content, lipid peroxidation and Cd(II) accumulation in plants...
April 4, 2018: Ecotoxicology and Environmental Safety
Garima Singh, Shubhandra Tripathi, Karuna Shanker, Ashok Sharma
Plants play an important role in the removal of excess heavy metals from soil and water. Medicinal plants can also have non-traditional use in phytoremediation technologies. Among the heavy metals, Cadmium (Cd) is the most abundant and readily taken up by the crop plants. Plant metallothioneins (MTs) are small proteins having cysteine rich residues and appear to play key roles in metal homeostasis. Plant metallothionein 2 (MT 2) from Coptis japonica (Gold-thread; CjMT 2) is a typical member of this subfamily and features two cysteine-rich regions containing eight and six cysteine residues, respectively, separated by 42 amino acids long linker region...
April 6, 2018: Journal of Biomolecular Structure & Dynamics
Vinod Kumar, Jogendra Singh, A K Chopra
This study was conducted to assess the pollutant uptake capability of water lettuce (Pistia stratiotes L.) in terms of bioaccumulation, enrichment, and translocation of heavy metals grown in sugar mill effluent. Results showed that the maximum fresh weight (328.48 ± 2.04 gm kg-1 ), total chlorophyll content (2.13 ± 2.03 mg g-1 fwt), and relative growth rate, RGR (11.89 gg-1 d-1 ) of P. stratiotes were observed at 75% concentration of the sugar mill effluent after 60 days of phytoremediation experiment...
April 16, 2018: International Journal of Phytoremediation
Xu Zhang, Xinxin Li, Huanhuan Yang, Zhaojie Cui
This study focused on the bioremediation mechanisms of lead (0, 100, 500, 1000 mg kg-1 ) and cadmium (0,10,50,100 mg kg-1 ) contaminated soil using two indigenous fungi selected from mine tailings as the phytostimulation of Arabidopsis thaliana. The two fungal strains were characterized as Mucor circinelloides (MC) and Trichoderma asperellum (TA) by internal transcribed spacer sequencing at the genetic levels. Our research revealed that Cadmium was more toxic to plant growth than lead and meanwhile, MC and TA can strengthen A...
March 29, 2018: Ecotoxicology and Environmental Safety
Ganesh Chandra Kisku, Vinay Kumar, Pokhraj Sahu, Pramod Kumar, Narendra Kumar
Mobilization of heavy metals around coal power plants due to improper disposal of fly ash (FA) and wastewater have led to release of pollutants into the environment. For protection of inimitable natural resources, application of economical and effective technologies is needed such as phytoremediation is cost-effective, ecofriendly and a better option for elimination of metal from contaminated sites. Twelve plant species were sampled from ash dyke of Singrauli and screened for accumulation of metals for this study...
March 21, 2018: International Journal of Phytoremediation
Lianwen Liu, Wei Li, Weiping Song, Mingxin Guo
Globally there are over 20millionha of land contaminated by the heavy metal(loid)s As, Cd, Cr, Hg, Pb, Co, Cu, Ni, Zn, and Se, with the present soil concentrations higher than the geo-baseline or regulatory levels. In-situ and ex-situ remediation techniques have been developed to rectify the heavy metal-contaminated sites, including surface capping, encapsulation, landfilling, soil flushing, soil washing, electrokinetic extraction, stabilization, solidification, vitrification, phytoremediation, and bioremediation...
March 21, 2018: Science of the Total Environment
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