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Phytoremediation of heavy metal

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https://www.readbyqxmd.com/read/28437478/metal-accumulation-by-sunflower-helianthus-annuus-l-and-the-efficacy-of-its-biomass-in-enzymatic-saccharification
#1
Saurabh Sudha Dhiman, Xin Zhao, Jinglin Li, Dongwook Kim, Vipin C Kalia, In-Won Kim, Jae Young Kim, Jung-Kul Lee
Accumulation of metal contaminants in soil as a result of various industrial and anthropogenic activities has reduced soil fertility significantly. Phytoextraction of metal contaminants can improve soil fertility and provide inexpensive feedstock for biorefineries. We investigated the hyperaccumulation capacity of sunflower (Helianthus annuus) biomass by cultivating these plants in various concentrations of metal contaminants. Sunflowers were grown in soils contaminated with various levels of heavy metals (10-2,000 mg/kg dry soil)...
2017: PloS One
https://www.readbyqxmd.com/read/28436673/unique-rhizosphere-micro-characteristics-facilitate-phytoextraction-of-multiple-metals-in-soil-by-the-hyperaccumulating-plant-sedum-alfredii
#2
Dandi Hou, Kai Wang, Ting Liu, Haixin Wang, Zhi Lin, Jie Qian, Lingli Lu, Shengke Tian
Understanding the strategies that the roots of hyperaccumulating plants use to extract heavy metals from soils is important for optimizing phytoremediation. The rhizosphere characteristics of Sedum alfredii, a hyperaccumulator, were investigated 6 months after planting in weathered field soils contaminated with 5.8 μg·g-1 Cd, 1985.1 μg·g-1 Zn, 667.5 μg·g-1 Pb, and 698.8 μg·g-1 Cu. In contrast with the non-hyperaccumulating ecotype (NHE), the hyperaccumulating ecotype (HE) of S. alfredii was more tolerant to the metals and accumulated higher levels of Cd and Zn...
April 24, 2017: Environmental Science & Technology
https://www.readbyqxmd.com/read/28427272/biological-technologies-for-the-remediation-of-co-contaminated-soil
#3
Shujing Ye, Guangming Zeng, Haipeng Wu, Chang Zhang, Juan Dai, Jie Liang, Jiangfang Yu, Xiaoya Ren, Huan Yi, Min Cheng, Chen Zhang
Compound contamination in soil, caused by unreasonable waste disposal, has attracted increasing attention on a global scale, particularly since multiple heavy metals and/or organic pollutants are entering natural ecosystem through human activities, causing an enormous threat. The remediation of co-contaminated soil is more complicated and difficult than that of single contamination, due to the disparate remediation pathways utilized for different types of pollutants. Several modern remediation technologies have been developed for the treatment of co-contaminated soil...
April 21, 2017: Critical Reviews in Biotechnology
https://www.readbyqxmd.com/read/28413994/biological-methods-for-heavy-metal-decontamination-a-patent-review
#4
Vinay Sharma, Rupesh K Mishra
BACKGROUND: In the modern age of globalization and fast industrialization, the environmental matters are fetching more and more annoyance for human being. Heavy metals occur in immobilized form in sediments and as aggregates in nature. However due to the different human activities like ore mining and industrial processes, the natural biogeochemical cycles are disordered instigating amplified deposition of heavy metals in aquatic environments. The most common pollution causing heavy metals are considered to be the mercury, arsenic, lead, copper, silver, cadmium...
April 17, 2017: Recent Patents on Biotechnology
https://www.readbyqxmd.com/read/28397062/multi-metal-resistance-and-plant-growth-promotion-potential-of-a-wastewater-bacterium-pseudomonas-aeruginosa-and-its-synergistic-benefits
#5
Jayanta Kumar Biswas, Monojit Mondal, Jörg Rinklebe, Santosh Kumar Sarkar, Punarbasu Chaudhuri, Mahendra Rai, Sabry M Shaheen, Hocheol Song, Muhammad Rizwan
Water and soil pollution by toxic heavy metals (HMs) is increasing globally because of increase in population, industrialization and urbanization. It is a burning problem for the public, scientists, academicians and politicians how to tackle the toxic contaminants which jeopardize the environment. One possible solution for pollution abatement is a bioremediation-effective and innovative technology that uses biological systems for treatment of contaminants. Many bacteria synthesize indole-3-acetic acid (IAA) which is a product of L-tryptophan metabolism and belongs to the auxin class of plant growth-promoting hormone...
April 10, 2017: Environmental Geochemistry and Health
https://www.readbyqxmd.com/read/28388670/transcriptomic-and-physiological-analyses-of-medicago-sativa-l-roots-in-response-to-lead-stress
#6
Bo Xu, Yingzhe Wang, Shichao Zhang, Qiang Guo, Yan Jin, Jingjing Chen, Yunhang Gao, Hongxia Ma
Lead (Pb) is one of the nonessential and toxic metals that threaten the environment and human health. Medicago sativa L. is a legume with high salt tolerance and high biomass production. It is not only a globally important forage crop but is also an ideal plant for phytoremediation. However, the biological and molecular mechanisms that respond to heavy metals are still not well defined in M. sativa. In this study, de novo and strand-specific RNA-sequencing was performed to identify genes involved in the Pb stress response in M...
2017: PloS One
https://www.readbyqxmd.com/read/28386947/the-potential-of-genetic-engineering-of-plants-for-the-remediation-of-soils-contaminated-with-heavy-metals
#7
REVIEW
Elisa Fasani, Anna Manara, Flavio Martini, Antonella Furini, Giovanni DalCorso
The genetic engineering of plants to facilitate the reclamation of soils and waters contaminated with inorganic pollutants is a relatively new and evolving field, benefiting from the heterologous expression of genes that increase the capacity of plants to mobilize, stabilize and/or accumulate metals. The efficiency of phytoremediation relies on the mechanisms underlying metal accumulation and tolerance, such as metal uptake, translocation and detoxification. The transfer of genes involved in any of these processes into fast-growing, high-biomass crops may improve their reclamation potential...
April 7, 2017: Plant, Cell & Environment
https://www.readbyqxmd.com/read/28364646/the-influences-of-cr-tolerant-rhizobacteria-in-phytoremediation-and-attenuation-of-cr-vi-stress-in-agronomic-sunflower-helianthus-annuus-l
#8
Ali Bahadur, Rizwan Ahmad, Aftab Afzal, Huyuan Feng, Vishandas Suthar, Asfa Batool, Aman Khan, Muhammad Mahmood-Ul-Hassan
Chromium contamination of agronomic soil has to turn into a serious global problem. This research was pointed to assess the effects of three Cr-tolerant rhizobacteria (SS1, SS3, and SS6) on sunflower growth and heavy metal uptake under Cr smog i.e. 20, 30 and 40 ppm using K2Cr2O7. Root promotion assay and pot experiment were conducted to investigate and evaluate the effects of Cr tolerance rhizobacteria and Cr accumulation capacity of sunflower. From root promotion assay non-significant variation was observed in the root length between SS1 and SS3 compared with un-inoculated whereas SS6 enhanced the root length in the absence and presence of chromium...
July 2017: Chemosphere
https://www.readbyqxmd.com/read/28323451/phytostabilization-of-heavy-metals-by-the-emergent-macrophyte-vossia-cuspidata-roxb-griff-a-phytoremediation-approach
#9
Tarek M Galal, Fatma A Gharib, Safia M Ghazi, Khalid H Mansour
The present study was conducted to investigate the potential of Vossia cuspidata as a phytoremediator to accumulate heavy metals from polluted water bodies. Thirty-two quadrats, distributed equally in eight sites (six polluted sites along Ismailia canal and two unpolluted sites along the Nile River) were selected seasonally for plant, water and sediment investigations. Winter plants recorded the highest values of shoot height, diameter, and leaf width, but the lowest shoot density. Plants collected in autumn had the lowest values of leaf length, width and area, while those in spring had the highest shoot density, with the lowest shoot height...
March 21, 2017: International Journal of Phytoremediation
https://www.readbyqxmd.com/read/28285205/soil-heavy-metal-contamination-and-health-risks-associated-with-artisanal-gold-mining-in-tongguan-shaanxi-china
#10
Ran Xiao, Shuang Wang, Ronghua Li, Jim J Wang, Zengqiang Zhang
Soil contamination with heavy metals due to mining activities poses risks to ecological safety and human well-being. Limited studies have investigated heavy metal pollution due to artisanal mining. The present study focused on soil contamination and the health risk in villages in China with historical artisanal mining activities. Heavy metal levels in soils, tailings, cereal and vegetable crops were analyzed and health risk assessed. Additionally, a botany investigation was conducted to identify potential plants for further phytoremediation...
March 9, 2017: Ecotoxicology and Environmental Safety
https://www.readbyqxmd.com/read/28251535/copper-tolerant-rhizosphere-bacteria-characterization-and-assessment-of-plant-growth-promoting-factors
#11
Manohari Rathi, Yogalakshmi Kadapakkam Nandabalan
Remediation of heavy metal contaminated soil is a major problem or concern worldwide. Heavy metal accumulation in the soil is increasing day by day by industries, mines, agriculture, fuel combustion and municipal waste discharge. Such contaminated soils harbour a large number of resistant microbial populations. Screening and isolation of such microbes would be utilized for natural remediation of metal contaminated soils. Therefore, in the present study, highly copper-tolerant bacteria from rhizosphere soil of Cynodon dactylon grown in brass effluent contaminated soil were isolated and assessed for plant growth promoting factors...
March 1, 2017: Environmental Science and Pollution Research International
https://www.readbyqxmd.com/read/28204874/effects-of-calcium-at-toxic-concentrations-of-cadmium-in-plants
#12
REVIEW
Danlian Huang, Xiaomin Gong, Yunguo Liu, Guangming Zeng, Cui Lai, Hassan Bashir, Lu Zhou, Dafei Wang, Piao Xu, Min Cheng, Jia Wan
This review provides new insight that calcium plays important roles in plant growth, heavy metal accumulation and translocation, photosynthesis, oxidative damage and signal transduction under cadmium stress. Increasing heavy metal pollution problems have raised word-wide concerns. Cadmium (Cd), being a highly toxic metal, poses potential risks both to ecosystems and human health. Compared with conventional technologies, phytoremediation, being cost-efficient, highly stable and environment-friendly, is believed to be a promising green technology for Cd decontamination...
February 15, 2017: Planta
https://www.readbyqxmd.com/read/28188207/use-of-endophytic-and-rhizosphere-bacteria-to-improve-phytoremediation-of-arsenic-contaminated-industrial-soils-by-autochthonous-betula-celtiberica
#13
Victoria Mesa, Alejandro Navazas, Ricardo González-Gil, Aida González, Nele Weyens, Béatrice Lauga, Jose Luis R Gallego, Jesús Sánchez, Ana Isabel Peláez
The aim of this study was to investigate the potential of indigenous arsenic-tolerant bacteria to enhance arsenic phytoremediation by the autochthonous pseudometallophyte Betula celtiberica The first goal was to perform an initial analysis of the entire rhizosphere and endophytic bacterial communities of the above-named accumulator plant, including the cultivable bacterial species. B. celtiberica's microbiome was dominated by taxa related to Flavobacteriales, Burkholderiales, and Pseudomonadales, especially the Pseudomonas and Flavobacterium genera...
April 15, 2017: Applied and Environmental Microbiology
https://www.readbyqxmd.com/read/28185852/pyrolysis-for-exploitation-of-biomasses-selected-for-soil-phytoremediation-characterization-of-gaseous-and-solid-products
#14
Paola Giudicianni, Stefania Pindozzi, Corinna Maria Grottola, Fernando Stanzione, Salvatore Faugno, Massimo Fagnano, Nunzio Fiorentino, Raffaele Ragucci
Biomasses to be used in the phytoremediation process are generally selected to match agronomic parameters and heavy metals uptake ability. A proper selection can be made greatly effective if knowledge of the properties of the residual char from pyrolysis is available to identify possible valorization routes. In this study a comparative analysis of the yields and characteristics of char obtained from slow pyrolysis of five uncontaminated biomasses (Populus nigra, Salix alba, Fraxinus oxyphylla, Eucalyptus occidentalis and Arundo donax) was carried out under steam atmosphere to better develop char porosity...
February 7, 2017: Waste Management
https://www.readbyqxmd.com/read/28185077/phytochelatin-2-accumulates-in-roots-of-the-seagrass-enhalus-acoroides-collected-from-sediment-highly-contaminated-with-lead
#15
Xuan-Vy Nguyen, Khanh-Hy Le-Ho, Jutta Papenbrock
Phytochelatins (PCs), the heavy metal-binding peptides of plants, play a main function in heavy metal detoxification. In this study, Enhalus acoroides samples collected at six distinct seagrass beds from the coast of Khanh Hoa province, Viet Nam, were evaluated for their PCs. The contents of different PCs in each organ including leaf, rhizome, and root were determined by using HPLC analysis. Significant differences of PC2 contents among specific organs and their relation were tested by ANOVA, Tukey test, and Pearson's correlation...
February 9, 2017: Biometals: An International Journal on the Role of Metal Ions in Biology, Biochemistry, and Medicine
https://www.readbyqxmd.com/read/28139323/photosynthesis-and-aboveground-carbon-allocation-of-two-co-occurring-poplar-species-in-an-urban-brownfield
#16
Diane Radwanski, Frank Gallagher, Dirk W Vanderklein, Karina V R Schäfer
Phytoremediation, a technique used to reclaim heavy metal-contaminated soils, requires an understanding of plant physiological responses to heavy metals. However, the majority of studies documenting heavy metal impact on plant functioning have been performed in laboratory or greenhouse settings. We predicted that increased soil heavy metal concentrations reduce photosynthesis and biomass production in trees growing in metal contaminated soil in a naturally re-vegetated urban brownfield. Leaf gas exchange, leaf carbon and nitrogen concentration, and tree biomass were recorded and compared for Populus deltoides and Populus tremuloides growing in an urban brownfield...
April 2017: Environmental Pollution
https://www.readbyqxmd.com/read/28092006/the-efficiency-of-eichhornia-crassipes-in-the-removal-of-organic-and-inorganic-pollutants-from-wastewater-a-review
#17
Saurabh Mishra, Abhijit Maiti
Water is a basic necessity of life, but due to overextraction and heavy input of nutrients from domestic and industrial sources, the contamination level of water bodies increase. In the last few decades, a potential interest has been aroused to treat wastewater by biological methodologies before discharge into the natural water bodies. Phytoremediation using water hyacinth is found to be an effective biological wastewater treatment method. Water hyacinth (Eichhornia crassipes), a notorious weed, being the most promising plant for removal of contaminants from wastewater is studied extensively in this regard...
January 16, 2017: Environmental Science and Pollution Research International
https://www.readbyqxmd.com/read/28073642/long-term-impact-of-primary-domestic-sewage-on-metal-loid-accumulation-in-drainage-ditch-sediments-plants-and-water-implications-for-phytoremediation-and-restoration
#18
Mathieu Nsenga Kumwimba, Bo Zhu, Fidèle Suanon, Diana Kavidia Muyembe, Mawuli Dzakpasu
We evaluate the long-term performance of a vegetated drainage ditch (VDD) treating domestic sewage with respect to heavy metal/metalloid (HM/M) accumulation in sediments, plants and water. VDD sediment contained significantly higher macro and trace elements compared to an agricultural ditch (AD) sediment. However, concentrations of HM/Ms in VDD sediment were below the ranges considered toxic to plants. Most HM/Ms were efficiently removed in the VDD, whereby removal efficiencies varied between 11% for Al and 89% for K...
January 7, 2017: Science of the Total Environment
https://www.readbyqxmd.com/read/28061428/phytoremediation-strategies-for-soils-contaminated-with-heavy-metals-modifications-and-future-perspectives
#19
REVIEW
Nadeem Sarwar, Muhammad Imran, Muhammad Rashid Shaheen, Wajid Ishaque, Muhammad Asif Kamran, Amar Matloob, Abdur Rehim, Saddam Hussain
Presence of heavy metals in agricultural soils is of major environmental concern and a great threat to life on the earth. A number of human health risks are associated with heavy metals regarding their entry into food chain. Various physical, chemical and biological techniques are being used to remove heavy metals and metalloids from soils. Among them, phytoremediation is a good strategy to harvest heavy metals from soils and have been proven as an effective and economical technique. In present review, we discussed various sources and harmful effects of some important heavy metals and metalloids, traditional phytoremediation strategies, mechanisms involved in phytoremediation of these metals, limitations and some recent advances in phytoremediation approaches...
December 23, 2016: Chemosphere
https://www.readbyqxmd.com/read/28040555/juncus-spp-the-helophyte-for-all-phyto-remediation-purposes
#20
Evdokia Syranidou, Stavros Christofilopoulos, Nicolas Kalogerakis
Helophytic plants contribute significantly to the remediation of ecosystems through a wide range of physiological or biochemical mechanisms including the role of endophytic bacteria. This review highlights the services provided by Juncus spp. wetland plants, from phytoremediation of soils and groundwater with heavy metals and/or organics to municipal or industrial wastewater treatment in constructed wetlands. The data presented also provide information on the efficiency of specific Juncus spp. in response to various metals and organic compounds, in an effort to exploit the natural capabilities of autochthonous over exotic species in phytoremediation strategies...
December 28, 2016: New Biotechnology
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