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https://www.readbyqxmd.com/read/28735243/interactions-between-pteris-vittata-l-genotypes-and-a-polycyclic-aromatic-hydrocarbon-pah-degrading-bacterium-alcaligenes-sp-in-arsenic-uptake-and-pah-dissipation
#1
Lu Sun, Ganghui Zhu, Xiaoyong Liao, Xiulan Yan
The effects of two Pteris vittata L. accessions and a polycyclic aromatic hydrocarbon (PAH)-degrading bacterium (Alcaligenes sp.) on arsenic (As) uptake and phenanthrene dissipation were studied. The Alcaligenes sp. survived in the rhizosphere and improved soil As bioavailability with co-exposure. However, bacterial inoculation altered Pteris vittata L. stress tolerance, and substantially affected the As distribution in the rhizosphere of the two P. vittata accessions. Bacterial inoculation was beneficial to protect the Guangxi accession against the toxic effects, and significantly increased plant As and phenanthrene removal ratios by 27...
July 20, 2017: Environmental Pollution
https://www.readbyqxmd.com/read/28708621/treatment-of-a-mixed-wood-preservative-leachate-by-a-hybrid-constructed-wetland-and-a-willow-planted-filter
#2
S Lévesque, E Demers, J Brisson, Y Comeau
The performance and removal mechanisms of a hybrid constructed wetland (HCW) followed by a willow planted filter (WPF) were evaluated for the treatment of a leachate contaminated by wood pole preservatives (pentachlorophenol (PCP) and chromated copper arsenate) to reach the storm sewer discharge limits. The HCW aimed to dechlorinate the PCP and polychlorodibenzo-p-dioxins/polychlorodibenzofuran (PCDD/F) and to remove metals by adsorption and precipitation. The HCW was efficient in removing PCP (>98.6%), oil, arsenic (99...
July 2017: Water Science and Technology: a Journal of the International Association on Water Pollution Research
https://www.readbyqxmd.com/read/28708308/arsenic-resistant-and-plant-growth-promoting-firmicutes-and-%C3%AE-proteobacteria-species-from-industrially-polluted-irrigation-water-and-corresponding-cropland
#3
Nayab Qamar, Yasir Rehman, Shahida Hasnain
AIMS: The aim of the study was to explore irrigation water polluted with industrial waste and corresponding cropland to screen bacteria for As-detoxification and plant growth promotion. METHODS AND RESULTS: Plant growth promoting As-resistant cropland bacteria were isolated from contaminated irrigation water and corresponding agricultural soil. Phylogenetic analysis revealed that the isolates belonged to 2 distinct bacterial lineages; Firmicutes and γ-Proteobacteria...
July 14, 2017: Journal of Applied Microbiology
https://www.readbyqxmd.com/read/28704693/investigation-of-arsenic-accumulation-and-biochemical-response-of-in-vitro-developed-vetiveria-zizanoides-plants
#4
Shraddha Singh, Suvarna Sounderajan, Kiran Kumar, D P Fulzele
Vetiver grass (Vetiveria zizanoides L. Nash) is found to be a suitable candidate for the phytoremediation of heavy metals. An investigation of arsenic (As) accumulation, translocation and tolerance was conducted in V. zizanoides plantlets upon exposure to different concentrations of arsenic (10, 50, 100 and 200µM) for 7 and 14 d. V. zizanoides plants were found effective in remediation of As, maximum being at 200µM after 14 d of exposure. The results of TBARS and photosynthetic pigments demonstrated that plants did not experience significant toxicity at all the concentrations of As after 7 days, however an increase in their level was found after 14 d...
July 10, 2017: Ecotoxicology and Environmental Safety
https://www.readbyqxmd.com/read/28702037/transcriptomic-response-of-purple-willow-salix-purpurea-to-arsenic-stress
#5
Aymeric Yanitch, Nicholas J B Brereton, Emmanuel Gonzalez, Michel Labrecque, Simon Joly, Frederic E Pitre
Arsenic (As) is a toxic element for plants and one of the most common anthropogenic pollutants found at contaminated sites. Despite its severe effects on plant metabolism, several species can accumulate substantial amounts of arsenic and endure the associated stress. However, the genetic mechanisms involved in arsenic tolerance remains obscure in many model plant species used for land decontamination (phytoremediation), including willows. The present study assesses the potential of Salix purpurea cv. 'Fish Creek' for arsenic phytoextraction and reveals the genetic responses behind arsenic tolerance, phytoextraction and metabolism...
2017: Frontiers in Plant Science
https://www.readbyqxmd.com/read/28684222/redox-biotransformation-of-arsenic-along-with-plant-growth-promotion-by-multi-metal-resistance-pseudomonas-sp-mx6
#6
Maria Shafique, Aqsa Jawaid, Yasir Rehman
Remediation of toxic metal-polluted sites by microorganisms is an environment-friendly remediation technique. Multi-metal-resistant bacteria were isolated from a wastewater treatment plant showing resistance against As(III), As(V), Cr, Co, Cu, Cd, Hg, Ni, Pb, Se and Zn. Maximum resistance against all metals was shown by the bacterial isolate MX-6 (As 20mM, Cd 30mM, Cr 5.0mM, Co 25mM, Cu 25mM, Ni 20mM, Zn 30mM, Pb 15mM, Se 20mM and Hg 2.5mM), which was identified as Pseudomonas sp. through 16S rDNA sequencing...
July 3, 2017: Comptes Rendus Biologies
https://www.readbyqxmd.com/read/28681292/biochars-mitigate-greenhouse-gas-emissions-and-bioaccumulation-of-potentially-toxic-elements-and-arsenic-speciation-in-phaseolus-vulgaris-l
#7
Muhammad Ibrahim, Gang Li, Sardar Khan, Qiaoqiao Chi, Yaoyang Xu
Anthropogenic and natural activities can lead to increased greenhouse gas emissions and discharge of potentially toxic elements (PTEs) into soil environment. Biochar amendment to soils is a cost-effective technology and sustainable approach used to mitigate greenhouse gas emissions, improve phytoremediation, and minimize the health risks associated with consumption of PTE-contaminated vegetables. Greenhouse pot experiments were conducted to investigate the effects of peanut shell biochar (PNB) and sewage sludge biochar (SSB) on greenhouse gas (GHG) emissions, plant growth, PTE bioaccumulation, and arsenic (As) speciation in bean plants...
July 5, 2017: Environmental Science and Pollution Research International
https://www.readbyqxmd.com/read/28679153/rice-planted-along-with-accumulators-in-arsenic-amended-plots-reduced-arsenic-uptake-in-grains-and-shoots
#8
Ashish Praveen, Sonali Mehrotra, Nandita Singh
An experiment was designed using phytoremadiation technology to obtain grains of rice safe for consumption. Sixteen plots of size 2 × 2 m were prepared (8 plots were treated with 50 mg kg(-1) of sodium arsenate and rest 8 without any treatment). The study was done for two plantations (1st and 2nd plantation). Rice was planted with three accumulators (Phragmites australis, Vetiveria zizanioides and Pteris vitatta) in treated and untreated plot. Arsenic in grains of Actr (R + Pt, R + Ph and R + Vt) for 1st plantation was 0...
October 2017: Chemosphere
https://www.readbyqxmd.com/read/28676914/influence-of-sulfur-on-the-arsenic-phytoremediation-using-vallisneria-natans-lour-hara
#9
Guoliang Chen, Tao Feng, Zhixian Li, Zhang Chen, Yuanqi Chen, Haihua Wang, Yanci Xiang
Influences of sulfur (S) on the accumulation and detoxification of arsenic (As) in Vallisneria natans (Lour.) Hara, an arsenic hyperaccumulating submerged aquatic plant, were investigated. At low sulfur levels (<20 mg/L), the thiols and As concentrations in the plant increased significantly with increasing sulfate nutrient supply. If sulfur levels were above 20 mg/L, the thiols and As concentrations in the plant did not increase further. There was a significant positive correlation between thiols and As in the plant...
July 4, 2017: Bulletin of Environmental Contamination and Toxicology
https://www.readbyqxmd.com/read/28676805/the-journey-of-arsenic-from-soil-to-grain-in-rice
#10
REVIEW
Surabhi Awasthi, Reshu Chauhan, Sudhakar Srivastava, Rudra D Tripathi
Arsenic (As) is a non-essential toxic metalloid whose elevated concentration in rice grains is a serious issue both for rice yield and quality, and for human health. The rice-As interactions, hence, have been studied extensively in past few decades. A deep understanding of factors influencing As uptake and transport from soil to grains can be helpful to tackle this issue so as to minimize grain As levels. As uptake at the root surface by rice plants depends on factors like iron plaque and radial oxygen loss...
2017: Frontiers in Plant Science
https://www.readbyqxmd.com/read/28672705/human-health-risk-assessment-and-riskiest-heavy-metal-origin-identification-in-urban-soils-of-yerevan-armenia
#11
Gevorg Tepanosyan, Lilit Sahakyan, Olga Belyaeva, Nairuhi Maghakyan, Armen Saghatelyan
The pollution of urban soils by heavy metals remains a topical issue because of the risks it represents to human health. Heavy metal pollution levels of Yerevan's soils were evaluated using Pollution index and Enrichment factor, while associated health risk was assessed by US EPA model. The heavy metals with significant amount of PI > 1 values were observed for V (100%), Cr (95.4%), Ni (92.5%), Cu (95.6%), Zn (92.9%), Hg (89.0%), Pb (99.9%), As (72.0%), and Ba (61.6% of samples). EF showed that Yerevan topsoils were significantly contaminated with Hg, and moderately contaminated with V, Ni, Cu, Zn, Cr, and As...
October 2017: Chemosphere
https://www.readbyqxmd.com/read/28668750/arsenic-contamination-in-irrigation-water-agricultural-soil-and-maize-crop-from-an-abandoned-smelter-site-in-matehuala-mexico
#12
Esther Aurora Ruíz-Huerta, Alonso de la Garza Varela, Juan Miguel Gómez-Bernal, Francisco Castillo, Miguel Avalos-Borja, Bhaskar SenGupta, Nadia Martínez-Villegas
Mobility of Arsenic (As) from metallurgical wastes in Matehuala, Mexico has been accounted for ultra-high concentration of As in water (4.8-158mg/L) that is used for recreational purposes as well as cultivation of maize. In this study, we (i) measured As concentrations in soils irrigated with this water, (ii) investigated the geochemical controls of available As, and (iii) measured bioaccumulation of As in maize. Water, soil, and maize plant samples were collected from 3 different plots to determine As in environmental matrices as well as water soluble As in soils...
June 21, 2017: Journal of Hazardous Materials
https://www.readbyqxmd.com/read/28667636/assessment-of-phytoremediation-ability-of-coriander-sativum-for-soil-and-water-co-contaminated-with-lead-and-arsenic-a-small-scale-study
#13
Nisha Gaur, Aayush Kukreja, Mahavir Yadav, Archana Tiwari
A study was conducted to access the phytoremediation potential of Coriandrum sativum for lead (Pb) and Arsenic (As). Metal tolerance index and pot experiment were conducted. Viable seeds were spread on filter paper and planted in soil placed in pots. The amount of Pb and As in control and in tailing soil was 0.27, 0.141, 1.77, and 0.35 ppm. The study was carried out in triplicates for a period of 4 weeks under natural conditions. The physico-chemical properties of soil were determined using the standard methods...
July 2017: 3 Biotech
https://www.readbyqxmd.com/read/28667412/exogenous-salicylic-acid-mediated-modulation-of-arsenic-stress-tolerance-with-enhanced-accumulation-of-secondary-metabolites-and-improved-size-of-glandular-trichomes-in-artemisia-annua-l
#14
Anjana Kumari, Neha Pandey, Shashi Pandey-Rai
The present study was undertaken to find out individual and interactive effects of arsenic (As) and salicylic acid (SA) on an important medicinal plant, Artemisia annua. As uptake and its accumulation was detected and found to be maximum in roots at higher As concentration (150 μM). Under As treatments, H2O2 and MDA content were induced. Biomass and chlorophyll content were negatively affected under As treatments. Furthermore, enzymatic (SOD, CAT, APX, and GR) and non-enzymatic antioxidants were also enhanced under As treatments...
June 30, 2017: Protoplasma
https://www.readbyqxmd.com/read/28664715/the-history-of-arsenical-pesticides-and-health-risks-related-to-the-use-of-agent-blue
#15
Vladimir Bencko, Florence Yan Li Foong
Arsenicals in agriculture. Beginning in the 1970s, the use of arsenic compounds for such purposes as wood preservatives, began to grow. By 1980, in the USA, 70% of arsenic had been consumed for the production of wood preservatives. This practice was later stopped, due to the US Environmental Protection Agency (EPA) ban of the arsenic-and chromium-based wood preservative chromated copper arsenate. In the past, arsenical herbicides containing cacodylic acid as an active ingredient have been used extensively in the USA, from golf courses to cotton fields, and drying-out the plants before harvesting...
June 12, 2017: Annals of Agricultural and Environmental Medicine: AAEM
https://www.readbyqxmd.com/read/28660288/influence-of-water-management-on-the-active-root-associated-microbiota-involved-in-arsenic-iron-and-sulfur-cycles-in-rice-paddies
#16
Sarah Zecchin, Anna Corsini, Maria Martin, Lucia Cavalca
In recent years, the role of microorganisms inhabiting rice rhizosphere in promoting arsenic contamination has emerged. However, little is known concerning the species and metabolic properties involved in this phenomenon. In this study, the influence of water management on the rhizosphere microbiota in relation to arsenic dissolution in soil solution was tested. Rice plants were cultivated in macrocosms under different water regimes: continuous flooding, continuous flooding with a 2-week period drainage before flowering, and dry soil watered every 10 days...
June 28, 2017: Applied Microbiology and Biotechnology
https://www.readbyqxmd.com/read/28656245/synergistic-cytotoxic-effects-of-arsenite-and-tetrandrine-in-human-breast-cancer-cell-line-mcf-7
#17
Mingjiang Yao, Bo Yuan, Xiao Wang, Ai Sato, Kana Sakuma, Kurumi Kaneko, Hana Komuro, Ayane Okazaki, Hideki Hayashi, Hiroo Toyoda, Xiaohua Pei, Xiaomei Hu, Toshihiko Hirano, Norio Takagi
To provide novel insight into the development of new therapeutic strategies to combat breast cancer using trivalent arsenic (AsIII)-based combination therapy, the cytotoxicity of a combination of AsIII and tetrandrine (Tetra), a Chinese plant-derived alkaloid, was investigated in the human breast cancer cell line MCF-7. Cytotoxicity was evaluated using cell viability, colony formation, wound healing, lactate dehydrogenase leakage and cell cycle assay. Alterations of genes associated with cell proliferation and death were analyzed using real-time PCR and western blotting...
June 23, 2017: International Journal of Oncology
https://www.readbyqxmd.com/read/28646312/silicon-and-rhizophagus-irregularis-potential-candidates-for-ameliorating-negative-impacts-of-arsenate-and-arsenite-stress-on-growth-nutrient-acquisition-and-productivity-in-cajanus-cajan-l-millsp-genotypes
#18
Neera Garg, Lakita Kashyap
Arsenic (As) gets accumulated in plants via phosphorous transporters and water channels and interferes with nutrient and water uptake, adversely affecting growth and productivity. Although, Si and AM have been reported to combat arsenic stress, their comparative and interactive roles in ameliorating As V and As III toxicities have not been reported. Study evaluated effects of Si and Rhizophagus irregularis on growth, As uptake and yield under arsenate and arsenite stress in two pigeonpea genotypes (metal tolerant-Pusa 2002 and metal sensitive-Pusa 991)...
June 23, 2017: Environmental Science and Pollution Research International
https://www.readbyqxmd.com/read/28642762/arbuscular-mycorrhiza-augments-arsenic-tolerance-in-wheat-triticum-aestivum-l-by-strengthening-antioxidant-defense-system-and-thiol-metabolism
#19
Surbhi Sharma, Garima Anand, Neeraja Singh, Rupam Kapoor
Arbuscular mycorrhiza (AM) can help plants to tolerate arsenic (As) toxicity. However, plant responses are found to vary with the host plant and the AM fungal species. The present study compares the efficacy of two AM fungi Rhizoglomus intraradices (M1) and Glomus etunicatum (M2) in amelioration of As stress in wheat (Triticum aestivum L. var. HD-2967). Mycorrhizal (M) and non-mycorrhizal (NM) wheat plants were subjected to four levels of As (0, 25, 50, and 100 mg As kg(-1) soil). Although As additions had variable effects on the percentage of root colonized by the two fungal inoculants, each mycobiont conferred benefits to the host plant...
2017: Frontiers in Plant Science
https://www.readbyqxmd.com/read/28626450/microbial-phosphorus-solubilization-and-its-potential-for-use-in-sustainable-agriculture
#20
REVIEW
Elizabeth T Alori, Bernard R Glick, Olubukola O Babalola
The use of excess conventional Phosphorus (P) fertilizers to improve agricultural productivity, in order to meet constantly increasing global food demand, potentially causes surface and ground water pollution, waterway eutrophication, soil fertility depletion, and accumulation of toxic elements such as high concentration of selenium (Se), arsenic (As) in the soil. Quite a number of soil microorganisms are capable of solubilizing/mineralizing insoluble soil phosphate to release soluble P and making it available to plants...
2017: Frontiers in Microbiology
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