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https://www.readbyqxmd.com/read/28716414/functional-characterization-of-the-sbnrat1-gene-in-sorghum
#1
Muxue Lu, Zhigang Wang, Shan Fu, Guangzhe Yang, Mingxing Shi, Youshe Lu, Xiaohu Wang, Jixing Xia
The Natural Resistance Associated Macrophage Protein (Nramp) members play diverse roles in metal transport in plants. Recent studies have showed that OsNrat1 (OsNramp4) encodes an Al transporter, which is required for rice Al tolerance. In this study, we functionally characterized a Nramp member in sorghum, SbNrat1, which is homologous to OsNrat1 with 88% identity. SbNrat1 was expressed in both roots and shoots, and its expression was not induced by Al treatment. When expressed in yeast, SbNrat1 transports trivalent Al ion, but not Mn and Cd...
September 2017: Plant Science: An International Journal of Experimental Plant Biology
https://www.readbyqxmd.com/read/28702790/heavy-metal-induced-oxidative-stress-on-seed-germination-and-seedling-development-a-critical-review
#2
Mihiri Seneviratne, Nishanta Rajakaruna, Muhammad Rizwan, H M S P Madawala, Yong Sik Ok, Meththika Vithanage
Heavy metal contamination in soils can influence plants and animals, often leading to toxicosis. Heavy metals can impact various biochemical processes in plants, including enzyme and antioxidant production, protein mobilization and photosynthesis. Hydrolyzing enzymes play a major role in seed germination. Enzymes such as acid phosphatases, proteases and α-amylases are known to facilitate both seed germination and seedling growth via mobilizing nutrients in the endosperm. In the presence of heavy metals, starch is immobilized and nutrient sources become limited...
July 12, 2017: Environmental Geochemistry and Health
https://www.readbyqxmd.com/read/28702035/the-soybean-basic-helix-loop-helix-transcription-factor-org3-like-enhances-cadmium-tolerance-via-increased-iron-and-reduced-cadmium-uptake-and-transport-from-roots-to-shoots
#3
Zhaolong Xu, Xiaoqing Liu, Xiaolan He, Ling Xu, Yihong Huang, Hongbo Shao, Dayong Zhang, Boping Tang, Hongxiang Ma
Cadmium (Cd) is one of the most dangerous heavy metal pollutants in the environment and is toxic to animal and plant cells. On the other hand, iron (Fe) is an essential element for plant growth and development. The chlorosis of plant leaves under cadmium stress is similar to the typical symptom of iron deficiency. Recently, several Arabidopsis basic/helix-loop-helix (bHLH) transcription factors have been identified that are involved in the interactions between Cd and Fe. In the present study, over-expression the ORG3-like gene GmORG3, a bHLH transcription factor OBP3-responsive gene (ORG), enhanced Cd tolerance and stabilized Fe homeostasis...
2017: Frontiers in Plant Science
https://www.readbyqxmd.com/read/28690617/transcriptomic-analysis-of-soil-grown-t-aestivum-cv-root-to-reveal-the-changes-in-expression-of-genes-in-response-to-multiple-nutrients-deficiency
#4
Saurabh Gupta, Brijesh S Yadav, Utkarsh Raj, Shiri Freilich, Pritish K Varadwaj
Deficiency of necessary macronutrients, i.e., Potassium (K), Magnesium (Mg), Nitrogen (N), Phosphorus (P), and Sulfate (S) in the soil leads to a reduction in plant growth and yield, which is a result of changes in expression level of various genes. This study was performed to identify the differentially expressed genes and its associated metabolic pathways occurred in soil grown wheat root samples excavated from the control and treated fields. To identify the difference in gene expression levels due to deficiency of the said nutrients, a transcriptomic, meta-analysis was performed on array expression profile data...
2017: Frontiers in Plant Science
https://www.readbyqxmd.com/read/28674257/a-novel-role-of-merc-in-methylmercury-transport-and-phytoremediation-of-methylmercury-contamination
#5
Yuka Sone, Shimpei Uraguchi, Yasukazu Takanezawa, Ryosuke Nakamura, Hidemitsu Pan-Hou, Masako Kiyono
MerC, encoded by merC in the transposon Tn21 mer operon, is a heavy metal transporter with potential applications for phytoremediation of heavy metals such as mercuric ion and cadmium. In this study, we demonstrate that MerC also acts as a transporter for methylmercury. When MerC was expressed in Escherichia coli XL1-Blue, cells became hypersensitive to CH3Hg(I) and the uptake of CH3Hg(I) by these cells was higher than that by cells of the isogenic strain. Moreover, transgenic Arabidopsis plants expressing bacterial MerC or MerC fused to plant soluble N-ethylmaleimide-sensitive factor attachment protein receptors (SNAREs) accumulated CH3Hg(I) effectively and their growth was comparable to the wild-type plants...
2017: Biological & Pharmaceutical Bulletin
https://www.readbyqxmd.com/read/28672234/zinc-fertilisation-increases-grain-zinc-and-reduces-grain-lead-and-cadmium-concentrations-more-in-zinc-biofortified-than-standard-wheat-cultivar
#6
Muhammad Qaswar, Shahid Hussain, Zed Rengel
Given that plant uptake and transport systems for metals have some similarities, zinc (Zn)-biofortified cultivars may concurrently accumulate non-essential toxic heavy metals in grains. However, Zn-biofortified cultivars have never been tested for heavy metal accumulation in grains. In a pot experiment, we compared Zn-biofortified wheat (Zincol-2016) with a standard wheat (Faisalabad-2008) cultivar on heavy-metal-contaminated soils for yield response and grain accumulation of Zn, lead (Pb) and cadmium (Cd), without or with Zn fertilisation (8mgZnkg(-1))...
June 30, 2017: Science of the Total Environment
https://www.readbyqxmd.com/read/28667858/pollution-and-ecological-risk-assessment-of-heavy-metals-in-the-soil-plant-system-and-the-sediment-water-column-around-a-former-pb-zn-mining-area-in-ne-morocco
#7
Abdellah El Azhari, Ali Rhoujjati, Moulay Laârabi El Hachimi, Jean-Paul Ambrosi
This study discussed the environmental fate and ecological hazards of heavy metals in the soil-plant system and sediment-water column around the former Pb-Zn mining Zeïda district, in Northeastern Morocco. Spatial distribution, pollution indices, and cluster analysis were applied for assessing Pb, Zn, As, Cu and Cd pollution levels and risks. The geo-accumulation index (Igeo) was determined using two different geochemical backgrounds: i) the commonly used upper crust values, ii) local geochemical background calculated with exploratory data analysis...
June 28, 2017: Ecotoxicology and Environmental Safety
https://www.readbyqxmd.com/read/28657742/microrna268-overexpression-affects-rice-seedling-growth-under-cadmium-stress
#8
Yanfei Ding, Yi Wang, Zhihua Jiang, Feijuan Wang, Qiong Jiang, Junwei Sun, Zhixiang Chen, Cheng Zhu
MicroRNAs (miRNAs) are 21-24 nucleotide RNAs that function as ubiquitous post-transcriptional regulators of gene expression in plants and animals. Increasing evidence points to the important role of miRNAs in plant responses to abiotic and biotic stresses. Cadmium (Cd) is a non-essential heavy metal highly toxic to plants. Although many genes encoding metal transporters have been characterized, the mechanisms for the regulation of the expression of the heavy metal transporter genes are largely unknown. In this study, we found that the expression of rice miR268 was significantly induced under Cd stress...
June 28, 2017: Journal of Agricultural and Food Chemistry
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
#9
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/28645067/using-a-detailed-inventory-of-a-large-wastewater-treatment-plant-to-estimate-the-relative-importance-of-construction-to-the-overall-environmental-impacts
#10
Serni Morera, Lluís Corominas, Miquel Rigola, Manel Poch, Joaquim Comas
The aim of this work is to quantify the relative contribution to the overall environmental impact of the construction phase compared to the operational phase for a large conventional activated sludge wastewater treatment plant (WWTP). To estimate these environmental impacts, a systematic procedure was designed to obtain the detailed Life Cycle Inventories (LCI) for civil works and equipment, taking as starting point the construction project budget and the list of equipment installed at the Girona WWTP, which are the most reliable information sources of materials and resources used during the construction phase...
June 2, 2017: Water Research
https://www.readbyqxmd.com/read/28642761/overexpression-of-bdmate-gene-improves-aluminum-tolerance-in-setaria-viridis
#11
Ana P Ribeiro, Wagner R de Souza, Polyana K Martins, Felipe Vinecky, Karoline E Duarte, Marcos F Basso, Bárbara A D B da Cunha, Raquel B Campanha, Patrícia A de Oliveira, Danilo C Centeno, Geraldo M A Cançado, Jurandir V de Magalhães, Carlos A F de Sousa, Alan C Andrade, Adilson K Kobayashi, Hugo B C Molinari
Acidic soils are distributed worldwide, predominantly in tropical and subtropical areas, reaching around 50% of the arable soil. This type of soil strongly reduces crop production, mainly because of the presence of aluminum, which has its solubility increased at low pH levels. A well-known physiological mechanism used by plants to cope with Al stress involves activation of membrane transporters responsible for organic acid anions secretion from the root apex to the rhizosphere, which chelate Al, preventing its absorption by roots...
2017: Frontiers in Plant Science
https://www.readbyqxmd.com/read/28633293/the-tonoplast-localized-transporter-mtp8-2-contributes-to-manganese-detoxification-in-the-shoots-and-roots-of-oryza-sativa-l
#12
Yuma Takemoto, Yuta Tsunemitsu, Miho Fujii-Kashino, Namiki Mitani-Ueno, Naoki Yamaji, Jian Feng Ma, Shin-Ichiro Kato, Kozo Iwasaki, Daisei Ueno
Manganese (Mn) cation diffusion facilitators (Mn-CDFs) play important roles in the Mn homeostasis of plants. In rice, the tonoplast-localized Mn-CDF metal tolerance protein 8.1 (MTP8.1) is involved in Mn detoxification in the shoots. This study functionally characterized the Mn-CDF MTP8.2 and determined its contribution to Mn tolerance. MTP8.2 was found to share 68% identity with MTP8.1 and was expressed in both the shoots and roots, but its transcription level was lower than that of MTP8.1. Transient expression of the MTP8...
June 13, 2017: Plant & Cell Physiology
https://www.readbyqxmd.com/read/28631167/copper-and-ectopic-expression-of-the-arabidopsis-transport-protein-copt1-alter-iron-homeostasis-in-rice-oryza-sativa-l
#13
Amparo Andrés-Bordería, Fernando Andrés, Antoni Garcia-Molina, Ana Perea-García, Concha Domingo, Sergi Puig, Lola Peñarrubia
Copper deficiency and excess differentially affect iron homeostasis in rice and overexpression of the Arabidopsis high-affinity copper transporter COPT1 slightly increases endogenous iron concentration in rice grains. Higher plants have developed sophisticated mechanisms to efficiently acquire and use micronutrients such as copper and iron. However, the molecular mechanisms underlying the interaction between both metals remain poorly understood. In the present work, we study the effects produced on iron homeostasis by a wide range of copper concentrations in the growth media and by altered copper transport in Oryza sativa plants...
June 19, 2017: Plant Molecular Biology
https://www.readbyqxmd.com/read/28630437/phylogenetic-analysis-of-f-bzip-transcription-factors-indicates-conservation-of-the-zinc-deficiency-response-across-land-plants
#14
Pedro Humberto Castro, Grmay H Lilay, Antonio Muñoz-Mérida, Jan K Schjoerring, Herlânder Azevedo, Ana G L Assunção
Basic leucine zipper (bZIP) transcription factors control important developmental and physiological processes in plants. In Arabidopsis thaliana, the three gene F-bZIP subfamily has been associated with zinc deficiency and salt stress response. Benefiting from the present abundance of plant genomic data, we performed an evolutionary and structural characterization of plant F-bZIPs. We observed divergence during seed plant evolution, into two groups and inferred different selective pressures for each. Group 1 contains AtbZIP19 and AtbZIP23 and appears more conserved, whereas Group 2, containing AtbZIP24, is more prone to gene loss and expansion events...
June 19, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28620857/distribution-of-potentially-toxic-elements-ptes-in-tailings-soils-and-plants-around-gol-e-gohar-iron-mine-a-case-study-in-iran
#15
Naghmeh Soltani, Behnam Keshavarzi, Farid Moore, Armin Sorooshian, Mohamad Reza Ahmadi
This study investigated the concentration of potentially toxic elements (PTEs) including Al, As, Cd, Co, Cr, Cu, Fe, Hg, Mn, Mo, Ni, Pb, Sb, V, and Zn in 102 soils (in the Near and Far areas of the mine), 7 tailings, and 60 plant samples (shoots and roots of Artemisia sieberi and Zygophylum species) collected at the Gol-E-Gohar iron ore mine in Iran. The elemental concentrations in tailings and soil samples (in Near and Far areas) varied between 7.4 and 35.8 mg kg(-1) for As (with a mean of 25.39 mg kg(-1) for tailings), 7...
June 15, 2017: Environmental Science and Pollution Research International
https://www.readbyqxmd.com/read/28620222/nitric-oxide-mediated-transcriptional-modulation-enhances-plant-adaptive-responses-to-arsenic-stress
#16
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/28601654/natural-radionuclides-in-plants-soils-and-sediments-affected-by-u-rich-coal-mining-activities-in-brazil
#17
Juliana Aparecida Galhardi, Rafael García-Tenorio, Daniel Marcos Bonotto, Inmaculada Díaz Francés, João Gabriel Motta
Mining activities can increase the mobility of metals by accelerating the dissolution and leaching of minerals from the rocks and tailing piles to the environment and, consequently, their availability for plants and subsequent transfer to the food chain. The weathering of minerals and the disposal of coal waste in tailing piles can accelerate the generation of acid mine drainage (AMD), which is responsible for the higher dissolution of metals in mining areas. In this context, the behavior of U, Th and K in soils and sediment, and the transfer factor (TF) of (238)U, (234)U and (210)Po for soybean, wheat, pine and eucalyptus cultivated around a coal mine in southern Brazil was evaluated...
June 8, 2017: Journal of Environmental Radioactivity
https://www.readbyqxmd.com/read/28598201/fate-of-heavy-metals-in-vertical-subsurface-flow-constructed-wetlands-treating-secondary-treated-petroleum-refinery-wastewater-in-kaduna-nigeria
#18
Hassana Ibrahim Mustapha, J J A van Bruggen, P N L Lens
This study examined the performance of pilot scale vertical subsurface flow constructed wetlands (VSF-CW) planted with three indigenous plants, i.e. Typha latifolia, Cyperus alternifolius and Cynodon dactylon, in removing heavy metals from secondary treated refinery wastewater under tropical conditions. The T. latifolia planted VSF-CW had the best heavy metal removal performance, followed by the C. alternifolius planted VSF CW and then the C. dactylon planted VSF-CW. The data indicated that Cu, Cr, Zn, Pb, Cd and Fe were accumulated in the plants at all the three VSF-CWs...
June 9, 2017: International Journal of Phytoremediation
https://www.readbyqxmd.com/read/28588597/protein-biochemistry-and-expression-regulation-of-cadmium-zinc-pumping-atpases-in-the-hyperaccumulator-plants-arabidopsis-halleri-and-noccaea-caerulescens
#19
Seema Mishra, Archana Mishra, Hendrik Küpper
P1B-ATPases are decisive for metal accumulation phenotypes, but mechanisms of their regulation are only partially understood. Here, we studied the Cd/Zn transporting ATPases NcHMA3 and NcHMA4 from Noccaea caerulescens as well as AhHMA3 and AhHMA4 from Arabidopsis halleri. Protein biochemistry was analyzed on HMA4 purified from roots of N. caerulescens in active state. Metal titration of NcHMA4 protein with an electrochromic dye as charge indicator suggested that HMA4 reaches maximal ATPase activity when all internal high-affinity Cd(2+) binding sites are occupied...
2017: Frontiers in Plant Science
https://www.readbyqxmd.com/read/28588593/salinity-induced-palmella-formation-mechanism-in-halotolerant-algae-dunaliella-salina-revealed-by-quantitative-proteomics-and-phosphoproteomics
#20
Sijia Wei, Yangyang Bian, Qi Zhao, Sixue Chen, Jiawei Mao, Chunxia Song, Kai Cheng, Zhen Xiao, Chuanfang Zhang, Weimin Ma, Hanfa Zou, Mingliang Ye, Shaojun Dai
Palmella stage is critical for some unicellular algae to survive in extreme environments. The halotolerant algae Dunaliella salina is a good single-cell model for studying plant adaptation to high salinity. To investigate the molecular adaptation mechanism in salinity shock-induced palmella formation, we performed a comprehensive physiological, proteomics and phosphoproteomics study upon palmella formation of D. salina using dimethyl labeling and Ti(4+)-immobilized metal ion affinity chromatography (IMAC) proteomic approaches...
2017: Frontiers in Plant Science
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