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Phytoremediation of heavy metal

Zhi Ran, Cheng Chen, Fabo Chen, Ming'an Liao, Lijin Lin, Xiulan Lv, Qunxian Deng, Xun Wang, Jin Wang, Yi Tang, Huaxiong Li
Plant hormones can improve the phytoremediation capabilities of heavy metal hyperaccumulator plants. In this study, different doses of indole-3-butytric acid (IBA) were sprayed on the leaves of the lead (Pb) and zinc (Zn) accumulator plant Pseudostellaria maximowicziana, which was planted in Pb-Zn contaminated soil, and the effects of IBA on Pb and Zn accumulation levels in P. maximowicziana were studied. Spraying 25- and 50-mg/L IBA doses increased the stem, leaf and shoot biomasses of P. maximowicziana compared with the control, while 75- and 100-mg/L IBA doses decreased them...
March 13, 2018: Environmental Monitoring and Assessment
Paola Mattei, Alessandro Gnesini, Cristina Gonnelli, Chiara Marraccini, Grazia Masciandaro, Cristina Macci, Serena Doni, Renato Iannelli, Stefano Lucchetti, Francesco P Nicese, Giancarlo Renella
Sediments dredged by an industrial port, slightly contaminated by heavy metals and petroleoum hydrocarbons, were phytoremediated and used as peat-free growing media for the red robin photinia (Photinia x fraseri L.). Plants were grown on sediment only (S), sediment mixed with composted pruning residues (S + PR), sediment fertilized with controlled release fertilizers (S + F) and peat-based growing media as control (C). Plant elongation and dry weight, leaf contents of chlorophyll, malondialdehyde (MDA), macronutrients and heavy metals were determined at the end of one growing season...
February 27, 2018: Chemosphere
Shunhui Yu, Li Sheng, Chunyan Zhang, Hongping Deng
The present paper deals with the physiological response of the changes in chemical contents of the root, stem and leaf of Arundo donax seedlings stressed by excess cadmium using Fourier transform infrared spectroscopy technique, cadmium accumulation in plant by atomic absorption spectroscopy were tested after different concentrations cadmium stress. The results showed that low cadmium concentrations (<1.0mg/L) the root tissue of Arundo donax uses osmosis of organic substances (e.g. carbohydrates and amino acids) to improve cadmium tolerance...
February 13, 2018: Spectrochimica Acta. Part A, Molecular and Biomolecular Spectroscopy
Aleksandra Koźmińska, Alina Wiszniewska, Ewa Hanus-Fajerska, Ewa Muszyńska
Avoidance and reduction of soil contamination with heavy metals is one of the most serious global challenges. Nowadays, science offers us new opportunities of utilizing plants to extract toxic elements from the soil by means of phytoremediation. Plant abilities to uptake, translocate, and transform heavy metals, as well as to limit their toxicity, may be significantly enhanced via genetic engineering. This paper provides a comprehensive review of recent strategies aimed at the improvement of plant phytoremediation potential using plant transformation and employing current achievements in nuclear and cytoplasmic genome transformation...
2018: Plant Biotechnology Reports
Xiaotong Wang, Junkai Zhi, Xinru Liu, Hao Zhang, Huabo Liu, Jichen Xu
Heavy metal ATPase (HMA) plays an important role in phytoremediation via long-distance transportation from root to shoot. In this report, we identified a heavy metal ATPase gene, PtoHMA5, from Populus tomentosa Carr. Its encoded peptide consists of 967 amino acids and has eight trans-membrane motifs inside. Tobacco plants were transformed with this gene via Agrobacterium tumefaciens-mediated method. After exposure to 50 mg/LCdCl2 for 10 d, the transgenic lines displayed higher cadmium accumulation in leaves than did the wild-type plants with an absolute increase of 25...
February 28, 2018: International Journal of Biological Macromolecules
Jennifer L Wood, Caixian Tang, Ashley E Franks
Understanding how biotic and abiotic factors govern the assembly of rhizosphere-microbial communities is a long-standing goal in microbial ecology. In phytoremediation research, where plants are used to remediate heavy metal-contaminated soils, a deeper understanding of rhizosphere-microbial ecology is needed to fully exploit the potential of microbial-assisted phytoremediation. This study investigated whether Grime's competitor/stress-tolerator/ruderal (CSR) theory could be used to describe the impact of cadmium (Cd) and the presence of a Cd-accumulating plant, Carpobrotus rossii (Haw...
2018: Frontiers in Microbiology
Pungtip Kaewtubtim, Weeradej Meeinkuirt, Sumalee Seepom, John Pichtel
This study determines uptake and accumulation of radionuclides and heavy metals by Pluchea indica and Avicennia marina and evaluates phytoremediation potential via greenhouse and field experiments. P. indica and A. marina are considered excluders for40 K and262 Ra, and Pb since roots accumulated them in higher quantities compared to other plant parts, and the bioconcentration factor (BCF) and transfer factor (TF) values for Pb, and40 K and262 Ra were >1, respectively. Absorbed dose rate in air (D) showed significant values in sediments, which were generally over the maximum recommended value of 55nGyh-1 ...
February 2018: Marine Pollution Bulletin
Xiaoyan Liu, Xiaoxin Hu, Xinying Zhang, Xueping Chen, Jing Chen, Xiaoyu Yuan
A complex mix of organic pollutants and heavy metal made the remediation of contaminated wetlands more difficult. Few research focus on the remediation for pyrene enhanced by chemical reagents and pyrene degrading bacteria in the nickel co-contaminated soil. In this paper, the effect of chemical reagents (nitrilotriacetic acid and alkyl polyglucoside) and Bacillus subtilis on pyrene dissipation in phytoremediation of nickel co-contaminated soil by Scirpus triqueter was investigated. Similar seedlings of Scirpus triqueter were moved to uncontaminated soil and pyrene-nickel co-contaminated soil...
February 14, 2018: Ecotoxicology and Environmental Safety
Liping Sun, Yifeng Ma, Huihong Wang, Weipeng Huang, Xiaozhu Wang, Li Han, Wanmei Sun, Erqin Han, Bangjun Wang
Mercury (Hg) is a highly biotoxic heavy metal that contaminates the environment. Phytoremediation is a green technology for environmental remediation and is used to clean up Hg contaminated soil in recent years. In this study, we isolated an ATP-binding cassette (ABC) transporter gene PtABCC1 from Populus trichocarpa and overexpressed it in Arabidopsis and poplar. The transgenic plants conferred higher Hg tolerance than wild type (WT) plants, and overexpression of PtABCC1 could lead to 26-72% or 7-160% increase of Hg accumulation in Arabidopsis or poplar plants, respectively...
February 15, 2018: Biochemical and Biophysical Research Communications
Jin-Song Luo, Jing Huang, Da-Li Zeng, Jia-Shi Peng, Guo-Bin Zhang, Hai-Ling Ma, Yuan Guan, Hong-Ying Yi, Yan-Lei Fu, Bin Han, Hong-Xuan Lin, Qian Qian, Ji-Ming Gong
Pollution by heavy metals limits the area of land available for cultivation of food crops. A potential solution to this problem might lie in the molecular breeding of food crops for phytoremediation that accumulate toxic metals in straw while producing safe and nutritious grains. Here, we identify a rice quantitative trait locus we name cadmium (Cd) accumulation in leaf 1 (CAL1), which encodes a defensin-like protein. CAL1 is expressed preferentially in root exodermis and xylem parenchyma cells. We provide evidence that CAL1 acts by chelating Cd in the cytosol and facilitating Cd secretion to extracellular spaces, hence lowering cytosolic Cd concentration while driving long-distance Cd transport via xylem vessels...
February 13, 2018: Nature Communications
Ming-Bao Luan, Jian-Bo Jian, Ping Chen, Jun-Hui Chen, Jian-Hua Chen, Qiang Gao, Gang Gao, Ju-Hong Zhou, Kun-Mei Chen, Xuan-Min Guang, Ji-Kang Chen, Qian-Qian Zhang, Xiao-Fei Wang, Long Fang, Zhi-Min Sun, Ming-Zhou Bai, Xiao-Dong Fang, Shan-Cen Zhao, He-Ping Xiong, Chun-Ming Yu, Ai-Guo Zhu
Ramie, Boehmeria nivea (L.) Gaudich, family Urticaceae, is a plant native to eastern Asia, and one of the world's oldest fiber crops. It is also used as animal feed and for the phytoremediation of heavy metal-contaminated farmlands. Thus, the genome sequence of ramie was determined to explore the molecular basis of its fiber quality, protein content, and phytoremediation. For further understanding ramie genome, different paired-end and mate-pair libraries were combined to generate 134.31 Gb of raw DNA sequences using the Illumina whole-genome shotgun sequencing approach...
February 8, 2018: Molecular Ecology Resources
Miaochun Fan, Xiao Xiao, Yanqing Guo, Jun Zhang, Entao Wang, Weimin Chen, Yanbing Lin, Gehong Wei
Heavy metals can cause serious contamination of soils, especially in mining regions. A detailed understanding of the effects of heavy metals on plants and root-associated microbial communities could help to improve phytoremediation systems. In this study, black locust (Robinia pseudoacacia) seedlings with or without rhizobial inoculation were planted in soils contaminated with different levels of heavy metals. Bacterial communities in rhizosphere and bulk soil samples were analyzed using 16S rRNA gene sequencing on the Illumina MiSeq platform and shotgun metagenome sequencing on the Illumina HiSeq platform...
February 2, 2018: Chemosphere
Vitor S Liduino, Eliana F C Servulo, Fernando J S Oliveira
This study evaluated the use of commercial rhamnolipid biosurfactant supplementation in the phytoremediation of a soil via sunflower (Helianthus annuus L.) cultivation. The soil, obtained from an industrial area, was co-contaminated with heavy metals and petroleum hydrocarbons. The remediation tests were monitored for 90 days. The best results for removal of contaminants were obtained from the tests in which the sunflower plants were cultivated in soil with 4 mg kg-1 of the rhamnolipid. Under these conditions, reductions of 58% and 48% were obtained in the total petroleum hydrocarbon (TPH) and polycyclic aromatic hydrocarbon (PAH) concentrations, respectively; reductions in the concentrations of the following metals were also achieved: Ni (41%), Cr (30%), Pb (29%), and Zn (20%)...
February 1, 2018: Journal of Environmental Science and Health. Part A, Toxic/hazardous Substances & Environmental Engineering
Feng Qian, Xiangdong Zhu, Yuchen Liu, Quan Shi, Longhua Wu, Shicheng Zhang, Jianmin Chen, Zhiyong Jason Ren
Waste Sedum plumbizincicola (SP), a zinc (Zn) hyperaccumulator from phytoremediation, was recycled via a subcritical hydrothermal liquefaction (HTL) reaction into multiple streams of valuable products, including hydrochar, bio-oil, and carboxylic acids. Results show approximately 90% of Zn was released from the SP biomass during HTL at an optimized temperature of 220 °C, and the hazardous risk was mitigated via HTL reaction for hydrochar production. The low-Zn hydrochar could be further upgraded into porous carbon (PC) with high porosity and excellent capability of carbon dioxide (CO2) capture...
January 27, 2018: Environmental Science & Technology
Jie Zhang, Enrico Martinoia, Youngsook Lee
Soil contamination by heavy metals and metalloids such as cadmium (Cd) and arsenic (As) poses a major threat to the environment and to human health. Vacuolar sequestration is one of the main mechanisms by which plants control toxic materials including Cd and As. Understanding the mechanisms of heavy metal tolerance and accumulation can be useful both for phytoremediation and safe crop development. In this review, we summarize recent advances in deciphering the molecular mechanisms underlying vacuolar sequestration of Cd and As, and discuss potential biotechnological applications of this knowledge and efforts towards attaining these goals...
January 18, 2018: Plant & Cell Physiology
Candice McGladdery, David C Weindorf, Somsubhra Chakraborty, Bin Li, Laura Paulette, Dorina Podar, Delaina Pearson, Nana Yaw O Kusi, Bogdan Duda
Elemental concentrations in vegetation are of critical importance, whether establishing plant essential element concentrations (toxicity vs. deficiency) or investigating deleterious elements (e.g., heavy metals) differentially extracted from the soil by plants. Traditionally, elemental analysis of vegetation has been facilitated by acid digestion followed by quantification via inductively coupled plasma (ICP) or atomic absorption (AA) spectroscopy. Previous studies have utilized portable X-ray fluorescence (PXRF) spectroscopy to quantify elements in soils, but few have evaluated the vegetation...
January 15, 2018: Journal of Environmental Management
Xiaomin Gong, Danlian Huang, Yunguo Liu, Guangming Zeng, Rongzhong Wang, Jingjing Wei, Chao Huang, Piao Xu, Jia Wan, Chen Zhang
This study aimed to investigate the effect of pyrolysis on the stabilization of heavy metals in plant residues obtained after phytoremediation. Ramie residues, being collected after phytoremediation of metal contaminated sediments, were pyrolyzed at different temperatures (300-700 °C). Results indicated that pyrolysis was effective in the stabilization of Cd, Cr, Zn, Cu, and Pb in ramie residues by converting the acid-soluble fraction of metals into residual form and decreasing the TCLP-leachable metal contents...
January 5, 2018: Bioresource Technology
Reza Hesami, Azam Salimi, Seyed Majid Ghaderian
In the current study, soils of Tang-e Douzan mine, located in Isfahan, Iran, were collected and analyzed for soluble, exchangeable, and total amounts of Pb, Zn, Cd, Ca, and Mg. The maximum Pb, Zn, Cd, Ca, and Mg concentrations in soils were 2500, 1100, 59, 43,800, and 1320 mg/kg for total metals, 86, 83, 6.3, 4650, and 48 mg/kg for their exchangeable fractions, and 59, 3.7, 0.53, 430, and 6.4 mg/kg for their soluble fractions, respectively. All specimens collected, including 69 plant species, were analyzed for Pb, Zn, and Cd...
January 10, 2018: Environmental Science and Pollution Research International
Shrutika L Wadgaonkar, Yarlagadda V Nancharaiah, Giovanni Esposito, Piet N L Lens
Selenium concentrations in the soil environment are directly linked to its transfer in the food chain, eventually causing either deficiency or toxicity associated with several physiological dysfunctions in animals and humans. Selenium bioavailability depends on its speciation in the soil environment, which is mainly influenced by the prevailing pH, redox potential, and organic matter content of the soil. The selenium cycle in the environment is primarily mediated through chemical and biological selenium transformations...
January 5, 2018: Critical Reviews in Biotechnology
Wei Fan, Qing Guo, ChangYing Liu, Xueqin Liu, Meng Zhang, Dingpei Long, Zhonghuai Xiang, Aichun Zhao
Phytochelatin synthase (PCS) is an enzyme involved in the synthesis of phytochelatins, cysteine-rich peptides which play a key role in heavy metal (HM) detoxification of plants. Mulberry (Morus L.), one of the most ecologically and economically important tree genera, has the potential to remediate HM-contaminated soils. However, genes involved in HM detoxification in Morus, such as the PCS genes, have not been identified and characterized. In this study, we identified two Morus notabilis PCS genes based on a genome-wide analysis of the Morus genome database...
December 22, 2017: Gene
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