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https://www.readbyqxmd.com/read/28642762/arbuscular-mycorrhiza-augments-arsenic-tolerance-in-wheat-triticum-aestivum-l-by-strengthening-antioxidant-defense-system-and-thiol-metabolism
#1
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
#2
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
https://www.readbyqxmd.com/read/28623505/assessment-of-arsenic-content-in-soil-rice-grains-and-groundwater-and-associated-health-risks-in-human-population-from-ropar-wetland-india-and-its-vicinity
#3
Sakshi Sharma, Inderpreet Kaur, Avinash Kaur Nagpal
In the present study, potential health risks posed to human population from Ropar wetland and its vicinity, by consumption of inorganic arsenic (i-As) via arsenic contaminated rice grains and groundwater, were assessed. Total arsenic (t-As) in soil and rice grains were found in the range of 0.06-0.11 mg/kg and 0.03-0.33 mg/kg, respectively, on dry weight basis. Total arsenic in groundwater was in the range of 2.31-15.91 μg/L. i-As was calculated from t-As using relevant conversion factors. Rice plants were found to be arsenic accumulators as bioconcentration factor (BCF) was observed to be >1 in 75% of rice grain samples...
June 16, 2017: Environmental Science and Pollution Research International
https://www.readbyqxmd.com/read/28622092/exogenous-proline-enhances-the-sensitivity-of-tobacco-by-2-cells-to-arsenate
#4
Mst Nur-E-Nazmun Nahar, Mohammad Muzahidul Islam, Md Anamul Hoque, Anna Yonezawa, Md Yeasin Prodhan, Toshiyuki Nakamura, Yoshimasa Nakamura, Shintaro Munemasa, Yoshiyuki Murata
Arsenic causes physiological and structural disorders in plants. Proline is accumulated as a compatible solute in plants under various stress conditions and mitigates stresses. Here, we investigated the effects of exogenous proline on tobacco Bright Yellow-2 (BY-2) cultured cells under [Formula: see text] stress. Arsenate did not inhibit BY-2 cell growth at 40 and 50 μM but did it at 60 μM. Proline at 0.5 to 10 mM did not affect the cell growth but delayed it at 20 mM. At 40 μM [Formula: see text], neither 0...
June 16, 2017: Bioscience, Biotechnology, and Biochemistry
https://www.readbyqxmd.com/read/28621830/phytochelatin-synthase-ospcs1-plays-a-crucial-role-in-reducing-arsenic-levels-in-rice-grains
#5
Shimpei Hayashi, Masato Kuramata, Tadashi Abe, Hiroki Takagi, Kenjirou Ozawa, Satoru Ishikawa
Reduction of the levels of arsenic (As) in rice grains is an important challenge for agriculture. A recent study reported that the OsABCC1 transporter prevents As accumulation in grains by sequestering As-phytochelatin complexes into vacuoles in the upper nodes. However, how phytochelatins are provided in response to As remains unclear. Here, we show that the phytochelatin synthase OsPCS1 plays a crucial role in reducing As levels in rice grains. Using a forward genetic approach, we isolated two rice mutants (has1 and has2) in which As levels were much higher in grains but significantly lower in node I in comparison with the wild type...
June 16, 2017: Plant Journal: for Cell and Molecular Biology
https://www.readbyqxmd.com/read/28620728/contents-of-heavy-metals-in-chinese-edible-herbs-evidence-from-a-case-study-of-epimedii-folium
#6
Xiao-Hua Yang, Hua-Feng Zhang, Li-Li Niu, Ying Wang, Jiang-Hua Lai
Toxic heavy metal contamination in Chinese edible herbs has raised a worldwide concern. In this study, heavy metals in Epimedii Folium, an edible medicinal plant in China, were quantitatively analyzed. Variations of heavy metals in different species, in various organs (i.e., leaves, stems, and roots), in wild-growing and cultivated plants, and in 35 market samples of Epimedii Folium, were systematically investigated. In all of Epimedium samples, Hg (mercury) was not detectable (0.00 μg/g). Four species, Epimedium pubescens, Epimedium sagittatum, Epimedium brevicornu, and Epimedium wushanense, were found to contain Cu (copper) and Pb (lead)...
June 16, 2017: Biological Trace Element Research
https://www.readbyqxmd.com/read/28620222/nitric-oxide-mediated-transcriptional-modulation-enhances-plant-adaptive-responses-to-arsenic-stress
#7
Pradyumna Kumar Singh, Yuvraj Indoliya, Abhisekh Singh Chauhan, Surendra Pratap Singh, Amit Pal Singh, Sanjay Dwivedi, Rudra Deo Tripathi, Debasis Chakrabarty
Arsenic (As) contamination in rice leads to yield decline and causes carcinogenic risk to human health. Although the role of nitric oxide (NO) in reducing As toxicity is known, NO-mediated genetic modulation in the plant during arsenic toxicity has not yet been established. We analyzed the key components of NO metabolism and the correlations between NO interaction and arsenic stress using rice as a relevant model plant. Illumina sequencing was used to investigate the NO-mediated genome-wide temporal transcriptomic modulation in rice root upon AsIII exposure during 12 days (d) of the growth period...
June 15, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28618663/chemical-characteristics-and-source-apportionment-of-pm2-5-in-lanzhou-china
#8
Jihua Tan, Leiming Zhang, Xueming Zhou, Jingchun Duan, Yan Li, Jingnan Hu, Kebin He
Daily PM2.5 samples were collected during winter 2012 and summer 2013 at an urban site in Lanzhou and were analyzed for chemical compounds including water soluble inorganic ions (WSIN), trace elements, water soluble organic carbon (WSOC), carbonaceous species (OC/EC), polycyclic aromatic hydrocarbons (PAHs), and humic-like substances (HULIS). The seasonal-average reconstructed PM2.5 mass was 120.5μgm(-3) in winter and 34.1μgm(-3) in summer. The top three groups of species in PM2.5 were OC (35.4±13.9μgm(-3)), WSIN (34...
June 10, 2017: Science of the Total Environment
https://www.readbyqxmd.com/read/28613914/effect-of-rhizobacteria-on-arsenic-uptake-by-macrophyte-eichhornia-crassipes-mart-solms
#9
Parvinder Kaur, Simranjeet Singh, Vivek Kumar, Nasib Singh, Joginder Singh
Wastewater from municipal systems and industrial processes carries several trace metals including metalloid arsenic (As) which are considered serious environmental contaminants due to toxicity, and recalcitrant nature. In this study, we determined the phytoremediation of As by Eichhornia crassipes (Mart.) Solms either alone or in association with plant growth promoting rhizobacteria. Pseudomonas and Azotobacter inoculation to E. crassipes resulted in enhanced As removal compared to uninoculated control. Co-inoculation with a consortium of Pseudomonas, Azotobacter, Azospirillum, Actinomyces and Bacillus resulted in higher As (p<0...
June 14, 2017: International Journal of Phytoremediation
https://www.readbyqxmd.com/read/28599126/effect-of-water-management-and-silicon-on-germination-growth-phosphorus-and-arsenic-uptake-in-rice
#10
Zahida Zia, Hafiz Faiq Bakhat, Zulfiqar Ahmad Saqib, Ghulam Mustafa Shah, Shah Fahad, Muhammad Rizwan Ashraf, Hafiz Mohkum Hammad, Wajid Naseem, Muhammad Shahid
Silicon (Si) is the 2nd most abundant element in soil which is known to enhance stress tolerance in wide variety of crops. Arsenic (As), a toxic metalloid enters into the human food chain through contaminated water and food or feed. To alleviate the deleterious effect of As on human health, it is a need of time to find out an effective strategy to reduce the As accumulation in the food chain. The experiments were conducted during September-December 2014, and 2016 to optimize Si concentration for rice (Oryza sativa L...
June 6, 2017: Ecotoxicology and Environmental Safety
https://www.readbyqxmd.com/read/28597423/illumina-based-transcriptomic-profiling-of-panax-notoginseng-in-response-to-arsenic-stress
#11
Yanfang Liu, Yanhua Mi, Jianhua Zhang, Qiwan Li, Lu Chen
BACKGROUND: Panax notoginseng, a famous herbal medicine, has recently attracted great attention on its safety and quality since P. notoginseng can accumulate and tolerate As from growing environment. For the purpose of understanding As damage to the quality of P. notoginseng as well as corresponding tolerance mechanisms, genes involved in As stress response were identified using Illumina sequencing. RESULTS: Totally 91,979,946 clean reads were generated and were de novo assembled into 172,355 unigenes...
December 2016: Botanical Studies (Taipei, Taiwan)
https://www.readbyqxmd.com/read/28595096/occurrence-and-mobility-of-toxic-elements-in-coals-from-endemic-fluorosis-areas-in-the-three-gorges-region-sw-china
#12
Yan Xiong, Tangfu Xiao, Yizhang Liu, Jianming Zhu, Zengping Ning, Qingxiang Xiao
Fluorine (F) is a topic of great interest in coal-combustion related endemic fluorosis areas. However, little extent research exists regarding the environmental geochemistry of toxic elements that are enriched in coals and coal wastes in traditional endemic fluorosis areas, particularly focusing on their occurrences and mobilities during the weathering-leaching processes of coals and coal wastes in the surface environment. This paper addressed the issue of toxic elements in coals and coal wastes in the Three Gorges Region, Southwest (SW) China, where endemic fluorosis has historically prevailed, and investigated the distribution, occurrence, mobility features, and associated potential health risks...
June 5, 2017: Ecotoxicology and Environmental Safety
https://www.readbyqxmd.com/read/28584523/corrigendum-the-involvement-of-nitric-oxide-in-integration-of-plant-physiological-and-ultrastructural-adjustments-in-response-to-arsenic
#13
Fernanda S Farnese, Juraci A Oliveira, Elder A S Paiva, Paulo E Menezes-Silva, Adinan A da Silva, Fernanda V Campos, Cléberson Ribeiro
[This corrects the article on p. 516 in vol. 8, PMID: 28469622.].
2017: Frontiers in Plant Science
https://www.readbyqxmd.com/read/28577167/bacterial-rhizoplane-colonization-patterns-of-buchloe-dactyloides-growing-in-metalliferous-mine-tailings-reflect-plant-status-and-biogeochemical-conditions
#14
Linnea K Honeker, Julia W Neilson, Robert A Root, Juliana Gil-Loaiza, Jon Chorover, Raina M Maier
Plant establishment during phytostabilization of legacy mine tailings in semiarid regions is challenging due to low pH, low organic carbon, low nutrients, and high toxic metal(loid) concentrations. Plant-associated bacterial communities are particularly important under these harsh conditions because of their beneficial services to plants. We hypothesize that bacterial colonization profiles on rhizoplane surfaces reflect deterministic processes that are governed by plant health and the root environment. The aim of this study was to identify associations between bacterial colonization patterns on buffalo grass (Buchloe dactyloides) rhizoplanes and both plant status (leaf chlorophyll and plant cover) and substrate biogeochemistry (pH, electrical conductivity, total organic carbon, total nitrogen, and rhizosphere microbial community)...
June 2, 2017: Microbial Ecology
https://www.readbyqxmd.com/read/28573965/characterization-of-croatian-rape-brassica-sp-honey-by-pollen-spectrum-physicochemical-characteristics-and-multielement-analysis-by-icp-oes
#15
Blanka Bilić Rajs, Ivana Flanjak, Jelena Mutić, Vesna Vukojević, Slađana Đurđić, Ljiljana Primorac
Rape (Brassica sp.) unifloral honey from Croatia was characterized by certain physicochemical parameters, micro- and macroelement content, and pollen spectrum, as determined in 21 honey samples. The Brassica sp. pollen type was predominant in the analyzed samples and ranged between 60 and 98%, with Trifolium spp., Robinia pseudoacacia, Rosaceae, Helianthus annuus, Salix spp., and Taraxacum officinale as the main accompanying pollen types. The electrical conductivity mean value was 0.22 ± 0.05 mS/cm and the glucose/fructose ratio mean value was 1...
June 1, 2017: Journal of AOAC International
https://www.readbyqxmd.com/read/28551741/soil-calcium-significantly-promotes-uptake-of-inorganic-arsenic-by-garland-chrysanthemum-chrysanthemuml-coronarium-fertilized-with-chicken-manure-bearing-roxarsone-and-its-metabolites
#16
Lixian Yao, Lianxi Huang, Cuihua Bai, Zhaohuan He, Changmin Zhou
Roxarsone (ROX), a widely used feed organoarsenic additive, occurs as itself and its metabolites in animal manure that is commonly land used as fertilizer. Soil property impacts arsenic (As) speciation and bioavailability. Fourteen soils across China were used to conduct culture experiments to investigate As uptake by garland chrysanthemum (ChrysanthemumL coronarium), with the soils fertilized with chicken manure bearing ROX and its metabolites. The results show As(III) was the sole As form in garland chrysanthemum shoots, and As(III) and As(V) occurred in roots...
May 27, 2017: Environmental Science and Pollution Research International
https://www.readbyqxmd.com/read/28550601/potential-toxicity-of-trace-elements-and-nanomaterials-to-chinese-cabbage-in-arsenic-and-lead-contaminated-soil-amended-with-biochars
#17
Yasser Mahmoud Awad, Meththika Vithanage, Nabeel Khan Niazi, Muhammad Rizwan, Jörg Rinklebe, Jae E Yang, Yong Sik Ok, Sang Soo Lee
To our knowledge, this is the first report on exploring the interactive effects of various biochars (BCs) and nanomaterials (NMs) on plant growth and bioavailability of trace elements in soil. This study evaluated the bioavailability and toxicity of arsenic (As), lead (Pb), and NMs to cabbage plants. The BCs were produced from rice husk (RB), sewage sludge, and bamboo wood (WB). The BCs at 2.5 and 5% (w w(-1)), NMs for removing As (NMs-As) and heavy metals (NMs-HM) at 3000 mg kg(-1), and multi-walled carbon nanotubes (CNT) at 1000 mg kg(-1) were applied in bioassay and incubation experiments (40 days), along with the unamended soil as the control...
May 26, 2017: Environmental Geochemistry and Health
https://www.readbyqxmd.com/read/28545213/safe-utilization-of-heavy-metal-contaminated-farmland-by-mulberry-tree-cultivation-and-silk-production
#18
Xiaoming Wan, Mei Lei, Tongbin Chen, Yongbi Tan, Junxing Yang
Heavy-metal-contaminated soil threatens human health and environmental safety. Complete remediation of contaminated soil is expensive; therefore, phytomanagement has emerged as a cost-effective alternative. The current study investigated mulberry tree (Morus alba) plantation, silkworm cultivation, and silk production as phytomanagement options. Results defined the safety of planting mulberry trees in soils with lead (Pb) and arsenic (As) concentrations lower than 369 and 180mgkg(-1), respectively. Silkworms fed with mulberry leaves collected from slightly contaminated soil exhibited productive growth and normal silk production...
December 1, 2017: Science of the Total Environment
https://www.readbyqxmd.com/read/28539916/endophytic-fungi-piriformospora-indica-mediated-protection-of-host-from-arsenic-toxicity
#19
Shayan Mohd, Jagriti Shukla, Aparna S Kushwaha, Kapil Mandrah, Jai Shankar, Nidhi Arjaria, Prem N Saxena, Ram Narayan, Somendu K Roy, Manoj Kumar
Complex intercellular interaction is a common theme in plant-pathogen/symbiont relationship. Cellular physiology of both the partners is affected by abiotic stress. However, little is known about the degree of protection each offers to the other from different types of environmental stress. Our current study focused on the changes in response to toxic arsenic in the presence of an endophytic fungus Piriformospora indica that colonizes the paddy roots. The primary impact of arsenic was observed in the form of hyper-colonization of fungus in the host root and resulted in the recovery of its overall biomass, root damage, and chlorophyll due to arsenic toxicity...
2017: Frontiers in Microbiology
https://www.readbyqxmd.com/read/28537029/arsenic-accumulation-and-physiological-attributes-of-spinach-in-the-presence-of-amendments-an-implication-to-reduce-health-risk
#20
Muhammad Shahid, Marina Rafiq, Nabeel Khan Niazi, Camille Dumat, Saliha Shamshad, Sana Khalid, Irshad Bibi
The current study examined the effect of calcium (Ca) and ethylenediaminetetraacetic acid (EDTA) on arsenic (As) uptake and toxicity to spinach (Spinacia oleracea) as well as assessed the potential human health risks. Spinach seedlings were exposed to three levels of As (25, 125, and 250 μM) alone or together with three levels of EDTA (25, 125, and 250 μM) and Ca (1, 5, and 10 mM). The effect of EDTA and Ca was assessed in terms of As contents in roots and shoots, hydrogen peroxide production, chlorophyll contents, and lipid peroxidation...
May 24, 2017: Environmental Science and Pollution Research International
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