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https://www.readbyqxmd.com/read/28432978/cadmium-hampers-salt-tolerance-of-sesuvium-portulacastrum
#1
Mariem Wali, Soledad Martos, Laura Pérez-Martín, Chedly Abdelly, Tahar Ghnaya, Charlotte Poschenrieder, Benet Gunsé
It is well known that salinity reduces cadmium toxicity in halophytes. However, the possible interference of Cd with the mechanisms of salt tolerance is poorly explored. The aim of this study was to see whether Cd affects salt tolerance mechanisms in the halophyte Sesuvium portulacastrum. S. portulacastrum plants obtained from cuttings were grown in hydroponics for 3 weeks and then exposed to low (0.09 mM) or moderate (200 mM) NaCl concentrations, alone or in combination with 25 μM CdCl2. Microscopy observation revealed two strategies of salt tolerance: euhalophytism and secretion of salt by bladder cells...
April 13, 2017: Plant Physiology and Biochemistry: PPB
https://www.readbyqxmd.com/read/28432964/phytate-induced-arsenic-uptake-and-plant-growth-in-arsenic-hyperaccumulator-pteris-vittata
#2
Xue Liu, Jing-Wei Fu, Ni Tang, E B da Silva, Yue Cao, Benjamin L Turner, Yanshan Chen, Lena Q Ma
Phytate is abundant in soils, which is stable and unavailable for plant uptake. However, it occurs in root exudates of As-hyperaccumulator Pteris vittata (PV). To elucidate its effect on As uptake and growth, P. vittata were grown on agar media (63 μM P) containing 50 μM As and/or 50 or 500 μM phytate with non As-hyperaccumulator Pteris ensiformis (PE) as a congeneric control for 60 d. Phytate induced efficient As and P uptake, and enhanced growth in PV, but had little effects on PE. The As concentrations in PV fronds and roots were 157 and 31 mg kg(-1) in As50+phytate50, 2...
April 19, 2017: Environmental Pollution
https://www.readbyqxmd.com/read/28432507/study-of-the-potential-of-barnyard-grass-for-the-remediation-of-cd-and-pb-contaminated-soil
#3
Jianling Xu, Qiongyao Cai, Hanxi Wang, Xuejun Liu, Jing Lv, Difu Yao, Yue Lu, Wei Li, Yuanyuan Liu
In this study, the microwave digestion method was used to determine total cadmium (Cd) and lead (Pb) concentrations, the BCR method was used to determine different states of Cd and Pb, and atomic absorption spectroscopy (AAS) and inductively coupled plasma optical emission spectrometry (ICP-OES) were used to determine Cd and Pb concentrations in simulated soil and barnyard grass before and after planting barnyard grass to provide a theoretical basis for the remediation of Cd- and Pb-contaminated soil. The results showed that the bioconcentration factor changes with different Cd concentrations are relatively complex and that the removal rate increases regularly...
May 2017: Environmental Monitoring and Assessment
https://www.readbyqxmd.com/read/28428810/recent-achievements-obtained-by-chloroplast-transformation
#4
REVIEW
Muhamed Adem, Dereje Beyene, Tileye Feyissa
Chloroplasts play a great role for sustained wellbeing of life on the planet. They have the power and raw materials that can be used as sophisticated biological factories. They are rich in energy as they have lots of pigment-protein complexes capable of collecting sunlight, in sugar produced by photosynthesis and in minerals imported from the plant cell. Chloroplast genome transformation offers multiple advantages over nuclear genome which among others, include: integration of the transgene via homologus recombination that enables to eliminate gene silencing and position effect, higher level of transgene expression resulting into higher accumulations of foreign proteins, and significant reduction in environmental dispersion of the transgene due to maternal inheritance which helps to minimize the major critic of plant genetic engineering...
2017: Plant Methods
https://www.readbyqxmd.com/read/28427272/biological-technologies-for-the-remediation-of-co-contaminated-soil
#5
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/28423946/tween-80-surfactant-enhanced-bioremediation-toward-a-solution-to-the-soil-contamination-by-hydrophobic-organic-compounds
#6
Min Cheng, Guangming Zeng, Danlian Huang, Chunping Yang, Cui Lai, Chen Zhang, Yang Liu
The occurrence of hydrophobic organic compounds (HOCs) in the soil has become a highly significant environmental issue. This problem has been exacerbated by the strong sorption of HOCs to the soils, which makes them unavailable for most remediation processes. More and more works show that surfactant-enhanced biological technologies offer a great potential to clear up HOCs-contaminated soils. This article is a critical review of HOCs removal from soils using Tween 80 (one of the mostly used nonionic surfactants) aided biological remediation technologies...
April 20, 2017: Critical Reviews in Biotechnology
https://www.readbyqxmd.com/read/28413994/biological-methods-for-heavy-metal-decontamination-a-patent-review
#7
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/28411320/addition-of-straw-from-hyperaccumulator-plants-to-cadmium-contaminated-soil-increases-cadmium-uptake-by-loquat-seedlings
#8
Lijin Lin, Ming'an Liao, Xiulan Lv, Dong Liang, Hui Xia, Jin Wang, Xun Wang
The straw from three different cadmium (Cd) hyperaccumulators (Galinsoga parviflora, Youngia erythrocarpa, and Solanum photeinocarpum) was added to Cd-contaminated soil, and its effects on plant growth and Cd accumulation in loquat seedlings were evaluated. Straw from each of G. parviflora, Y. erythrocarpa, and S. photeinocarpum was added to Cd-contaminated soil before planting seedlings of two varieties of loquat (Dawuxing and Chuanzao). Addition of straw from G. parviflora and S. photeinocarpum increased the root and shoot biomasses of both loquat varieties, compared with that in the control...
May 2017: Environmental Monitoring and Assessment
https://www.readbyqxmd.com/read/28402310/treatment-of-urea-manufacturing-facility-effluent-by-hopea-odorata-and-khaya-ivorensis
#9
Sara Yavari, Amirhossein Malakahmad, Nasiman B Sapari, Saba Yavari
Phytoremediation is an environmentally friendly and sustainable alternative for treatment of nitrogen-enriched wastewaters. In this study, Ta-khian (Hopea odorata) and Lagos mahogany (Khaya ivorensis), two tropical timber plants, were investigated for their performances in treatment of urea manufacturing factory effluent with high nitrogen (N) content. Plant seedlings received four concentrations of N (190, 240, 290 and 340 mg/L N) in laboratory-scale constructed wetlands every 4 days for a duration of 8 weeks...
April 2017: Water Science and Technology: a Journal of the International Association on Water Pollution Research
https://www.readbyqxmd.com/read/28398082/transcriptomic-response-of-arabidopsis-thaliana-l-heynh-roots-to-ibuprofen
#10
Premysl Landa, Sylva Prerostova, Lenka Langhansova, Petr Marsik, Tomas Vanek
Surface waters in urban areas are contaminated by ibuprofen (IBP), a popular and extensively used anti-inflammatory drug. In this study, we investigated the transcriptomic response in Arabidopsis thaliana (L.) Heynh. roots with the aim of revealing genes that are potentially involved in IBP detoxification and to elucidate the effect of IBP on plants. IBP up-regulated 63 and down-regulated 38 transcripts (p-value < 0.1, fold change ≥ 2) after two-day exposure to a 5 µM (1.03 mg L(-1)) concentration of IBP under hydroponic conditions...
April 11, 2017: International Journal of Phytoremediation
https://www.readbyqxmd.com/read/28397062/multi-metal-resistance-and-plant-growth-promotion-potential-of-a-wastewater-bacterium-pseudomonas-aeruginosa-and-its-synergistic-benefits
#11
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/28391121/uptake-and-elimination-kinetics-of-perfluoroalkyl-substances-in-submerged-and-free-floating-aquatic-macrophytes-results-of-mesocosm-experiments-with-echinodorus-horemanii-and-eichhornia-crassipes
#12
N Pi, J Z Ng, B C Kelly
Studies investigating the bioaccumulation behavior of perfluoroalkyl substances (PFASs) in aquatic macrophytes are limited. The present study involved controlled mesocosm experiments to assess uptake and elimination rate constants (ku,ke), bioconcentration factors (BCFs) and translocation factors (TFs) of several perfluoroalkyl carboxylic acids (PFCAs) and perfluoroalkane sulfonic acids (PFSAs) in two aquatic plant species, including one submerged species (Echinodorus horemanii) and one free-floating species (Eichhornia crassipes)...
April 4, 2017: Water Research
https://www.readbyqxmd.com/read/28388670/transcriptomic-and-physiological-analyses-of-medicago-sativa-l-roots-in-response-to-lead-stress
#13
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/28387235/streptomyces-pactum-assisted-phytoremediation-in-zn-pb-smelter-contaminated-soil-of-feng-county-and-its-impact-on-enzymatic-activities
#14
Amjad Ali, Di Guo, Amanullah Mahar, Fang Ma, Ronghua Li, Feng Shen, Ping Wang, Zengqiang Zhang
Anthropogenic activities, such as industrial expansion, smelting, mining and agricultural practices, have intensified the discharge of potentially toxic trace elements (PTEs) into the environment, threatening human health and other organisms. To assist phytoremediation by sorghum in soil contaminated by smelters/mines in Feng County (FC), a pot experiment was performed to examine the phytoremediation potential of Streptomyces pactum (Act12) + biochar. The results showed that root uptake of Zn and Cd was reduced by 45 and 22%, respectively, while the uptake of Pb and Cu increased by 17 and 47%, respectively...
April 7, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28386947/the-potential-of-genetic-engineering-of-plants-for-the-remediation-of-soils-contaminated-with-heavy-metals
#15
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/28386902/effect-of-earthworms-on-growth-photosynthetic-efficiency-and-metal-uptake-in-brassica-juncea-l-plants-grown-in-cadmium-polluted-soils
#16
Parminder Kaur, Shagun Bali, Anket Sharma, Adarsh Pal Vig, Renu Bhardwaj
The present study has been carried out to examine the role of earthworms in phytoremediation of Cd and its effect on growth, pigment content, expression of genes coding key enzymes of pigments, photosynthetic efficiency and osmoprotectants in Brassica juncea L. plants grown under cadmium (Cd) metal stress. The effect of different Cd concentrations (0.50, 0.75, 1.0, 1.25 mM) was studied in 30 and 60-day-old plants grown in soils containing earthworms. It was observed that earthworm inoculation showed stimulatory effect on phytoremediation capacity and Cd uptake has increased by 49% (in 30-day-old plants) and 35% (in 60-day-old plants) in shoots and 13...
April 7, 2017: Environmental Science and Pollution Research International
https://www.readbyqxmd.com/read/28374199/efficiency-and-mechanism-of-the-phytoremediation-of-decabromodiphenyl-ether-contaminated-sediments-by-aquatic-macrophyte-scirpus-validus
#17
Liangyuan Zhao, Jinhui Jiang, Chuanhong Chen, Shuie Zhan, Jiaoyan Yang, Shao Yang
Phytoremediation is an economic and promising technique for removing toxic pollutants from the environment. Freshwater sediments are regarded as the ultimate sink of the widely used PBDE congener decabromodiphenyl ether (BDE-209) in the environment. In the study, the aquatic macrophyte Scirpus validus was selected to remove BDE-209 from three types of sediments (silt, clay, and sand) at an environmentally relevant concentration. After 18 months of phytoremediation experiment, S. validus significantly enhanced the dissipation rates of BDE-209 in all the sediments compared to the controls...
April 3, 2017: Environmental Science and Pollution Research International
https://www.readbyqxmd.com/read/28372821/a-review-of-germination-and-early-growth-as-a-proxy-for-plant-fitness-under-petrogenic-contamination-knowledge-gaps-and-recommendations
#18
REVIEW
Navjot Kaur, Todd E Erickson, Andrew S Ball, Megan H Ryan
Germination-an important stage in the life cycle of plants-is susceptible to the presence of soil contaminants. Since the early 1990s, the use of germination tests to screen multiple plant species to select candidates for phytoremediation has received much attention. This is due to its inexpensive methodology and fast assessment relative to greenhouse or field growth studies. Surprisingly, no comprehensive synthesis is available of these studies in the scientific literature. As more plant species are added to phytoremediation databases, it is important to encapsulate the knowledge thus far and revise protocols...
March 31, 2017: Science of the Total Environment
https://www.readbyqxmd.com/read/28365510/drivers-and-applications-of-integrated-clean-up-technologies-for-surfactant-enhanced-remediation-of-environments-contaminated-with-polycyclic-aromatic-hydrocarbons-pahs
#19
REVIEW
Xujun Liang, Chuling Guo, Changjun Liao, Shasha Liu, Lukas Y Wick, Dan Peng, Xiaoyun Yi, Guining Lu, Hua Yin, Zhang Lin, Zhi Dang
Surfactant-enhanced remediation (SER) is considered as a promising and efficient remediation approach. This review summarizes and discusses main drivers on the application of SER in removing polycyclic aromatic hydrocarbons (PAHs) from contaminated soil and water. The effect of PAH-PAH interactions on SER efficiency is, for the first time, illustrated in an SER review. Interactions between mixed PAHs could enhance, decrease, or have no impact on surfactants' solubilization power towards PAHs, thus affecting the optimal usage of surfactants for SER...
March 29, 2017: Environmental Pollution
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
#20
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...
March 26, 2017: Chemosphere
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