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Metal transporter plant

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https://www.readbyqxmd.com/read/28525880/differential-sulphur-assimilation-mechanism-regulates-response-of-arabidopsis-thaliana-natural-variation-towards-arsenic-stress-under-limiting-sulphur-condition
#1
Ria Khare, Smita Kumar, Tapsi Shukla, Avriti Ranjan, Prabodh Kumar Trivedi
Arsenic (As) is a ubiquitous element, which imposes threat to crops productivity and human health through contaminated food chain. As a part of detoxification mechanism, As is chelated and sequestered into the vacuoles via sulphur containing compounds glutathione (GSH) and phytochelatins (PCs). Under limiting sulphur (LS) conditions, exposure of As leads to enhanced toxic effects in plants. Therefore, it is a prerequisite to understand molecular mechanisms involved in As stress response under sulphur deficiency conditions in plants...
May 8, 2017: Journal of Hazardous Materials
https://www.readbyqxmd.com/read/28508171/over-expression-of-tobacco-ubc1-encoding-a-ubiquitin-conjugating-enzyme-increases-cadmium-tolerance-by-activating-the-20s-26s-proteasome-and-by-decreasing-cd-accumulation-and-oxidative-stress-in-tobacco-nicotiana-tabacum
#2
Ramin Bahmani, DongGwan Kim, Byoung Doo Lee, Seongbin Hwang
Ubiquitin (Ub)-conjugating enzyme (UBC, E2) receives Ub from Ub-activating enzyme (E1) and transfers it to target proteins, thereby playing a key role in Ub/26S proteasome-dependent proteolysis. UBC has been reported to be involved in tolerating abiotic stress in plants, including drought, salt, osmotic and water stresses. To isolate the genes involved in Cd tolerance, we transformed WT (wild-type) yeast Y800 with a tobacco cDNA expression library and isolated a tobacco cDNA, NtUBC1 (Ub-conjugating enzyme), that enhances cadmium tolerance...
May 15, 2017: Plant Molecular Biology
https://www.readbyqxmd.com/read/28500270/heavy-metals-induce-iron-deficiency-responses-at-different-hierarchic-and-regulatory-levels
#3
Alexandra Leskova, Ricardo Fabiano Hettwer Giehl, Anja Hartmann, Agáta Fargasová, Nicolaus von Wirén
In plants, the excess of several heavy metals mimics Fe deficiency-induced chlorosis indicating a disturbance in Fe homeostasis. To examine at which level heavy metals interfere with Fe-deficiency responses, we carried out an in-depth characterization of Fe-related physiological, regulatory and morphological responses in Arabidopsis thaliana exposed to heavy metals. Enhanced Zn uptake closely mimicked Fe deficiency by leading to low chlorophyll but high ferric-chelate reductase activity and coumarin release...
May 12, 2017: Plant Physiology
https://www.readbyqxmd.com/read/28485980/peat-bogs-document-decades-of-declining-atmospheric-contamination-by-trace-metals-in-the-athabasca-bituminous-sands-region
#4
William Shotyk, Peter G Appleby, Beatriz Bicalho, Lauren J Davies, Duane Froese, Iain Grant-Weaver, Gabriel Magnan, Gillian Mullan-Boudreau, Tommy Noernberg, Rick Pelletier, Robert Shannon, Simon van Bellen, Claudio Zaccone
Peat cores were collected from five bogs in the vicinity of open pit mines and upgraders of the Athabasca Bituminous Sands, and from a control site (Utikuma) which is 264 km SW. Frozen cores were sectioned into 1 cm slices, and trace metals determined in the ultraclean SWAMP lab using ICP-QMS. The uppermost sections of the cores were age-dated with (210)Pb using ultralow background gamma spectrometry, and selected plant macrofossils dated using (14)C. At each site, trace metal concentrations as well as enrichment factors (calculated relative to the corresponding M/Th ratio of the Upper Continental Crust) reveal maximum values 10 to 40 cm below the surface which shows that the zenith of atmospheric contamination occurred in the past...
May 9, 2017: Environmental Science & Technology
https://www.readbyqxmd.com/read/28469631/genome-wide-identification-cloning-and-functional-analysis-of-the-zinc-iron-regulated-transporter-like-protein-zip-gene-family-in-trifoliate-orange-poncirus-trifoliata-l-raf
#5
Xing-Zheng Fu, Xue Zhou, Fei Xing, Li-Li Ling, Chang-Pin Chun, Li Cao, Mark G M Aarts, Liang-Zhi Peng
Zinc (Zn) and iron (Fe) deficiency are widespread among citrus plants, but the molecular mechanisms regarding uptake and transport of these two essential metal ions in citrus are still unclear. In the present study, 12 members of the Zn/Fe-regulated transporter (ZRT/IRT)-related protein (ZIP) gene family were identified and isolated from a widely used citrus rootstock, trifoliate orange (Poncirus trifoliata L. Raf.), and the genes were correspondingly named as PtZIPs according to the sequence and functional similarity to Arabidopsis thaliana ZIPs...
2017: Frontiers in Plant Science
https://www.readbyqxmd.com/read/28461715/glutathione-in-plants-biosynthesis-and-physiological-role-in-environmental-stress-tolerance
#6
REVIEW
Mirza Hasanuzzaman, Kamrun Nahar, Taufika Islam Anee, Masayuki Fujita
Glutathione (GSH; γ-glutamyl-cysteinyl-glycine) is a small intracellular thiol molecule which is considered as a strong non-enzymatic antioxidant. Glutathione regulates multiple metabolic functions; for example, it protects membranes by maintaining the reduced state of both α-tocopherol and zeaxanthin, it prevents the oxidative denaturation of proteins under stress conditions by protecting their thiol groups, and it serves as a substrate for both glutathione peroxidase and glutathione S-transferase. By acting as a precursor of phytochelatins, GSH helps in the chelating of toxic metals/metalloids which are then transported and sequestered in the vacuole...
April 2017: Physiology and Molecular Biology of Plants: An International Journal of Functional Plant Biology
https://www.readbyqxmd.com/read/28461400/metal-tolerance-protein-8-mediates-manganese-homeostasis-and-iron-re-allocation-during-seed-development-and-germination
#7
Seckin Eroglu, Ricardo Fabiano Hettwer Giehl, Bastian Meier, Michiko Takahashi, Yasuko Terada, Konstantin Ignatiev, Elisa Andresen, Hendrik Kupper, Edgar Peiter, Nicolaus von Wirén
Metal accumulation in seeds is a prerequisite for germination and establishment of plants but also for micronutrient delivery to humans. To investigate metal transport processes and their interactions in seeds, we focused on METAL TOLERANCE PROTEIN 8 (MTP8), a tonoplast transporter of the Mn subclade of cation diffusion facilitators, which in Arabidopsis thaliana is expressed in embryos of seeds. X-ray fluorescence imaging showed that expression of MTP8 was responsible for Mn localization in subepidermal cells on the abaxial side of the cotyledons and in cortical cells of the hypocotyl...
May 1, 2017: Plant Physiology
https://www.readbyqxmd.com/read/28460235/first-charosphere-view-towards-the-transport-and-transformation-of-cd-with-addition-of-manure-derived-biochar
#8
Lu Wang, Jun Meng, Zhangtao Li, Xingmei Liu, Fang Xia, Jianming Xu
The specific area between biochar and soil surfaces is termed the "charosphere", which is analogous to the rhizosphere between plant roots and soil. Physicochemical properties of charosphere soil differ from natural soil. A double-layer mesh bag experiment was conducted to separate the charosphere soil (>2 mm) from biochar (derived from manure pyrolyzed at 300, 500, 700 °C) and the bulk soil. A 95-day experiment determined the availability, total concentration and speciation of Cd in charosphere soil and the total and available Cd in biochar...
April 28, 2017: Environmental Pollution
https://www.readbyqxmd.com/read/28455771/cadmium-and-zinc-activate-adaptive-mechanisms-in-nicotiana-tabacum-similar-to-those-observed-in-metal-tolerant-plants
#9
Rosario Vera-Estrella, María F Gómez-Méndez, Julio C Amezcua-Romero, Bronwyn J Barkla, Paul Rosas-Santiago, Omar Pantoja
Tobacco germinated and grew in the presence of high concentrations of cadmium and zinc without toxic symptoms. Evidence suggests that these ions are sequestered into the vacuole by heavy metal/H (+) exchanger mechanisms. Heavy metal hyperaccumulation and hypertolerance are traits shared by a small set of plants which show specialized physiological and molecular adaptations allowing them to accumulate and sequester toxic metal ions. Nicotiana tabacum was used to test its potential as a metal-accumulator in a glass house experiment...
April 28, 2017: Planta
https://www.readbyqxmd.com/read/28445036/silver-nanoparticles-and-wheat-roots-a-complex-interplay
#10
Ana E Pradas Del Real, Vladimir Vidal, Marie Carrière, Hiram Castillo-Michel, Clément Levard, Perrine Chaurand, Géraldine Sarret
Agricultural soils are major sinks of silver nanoparticles in the environment, and crops are directly exposed to these emerging contaminants. A clear picture of their chemical transformations, uptake and transport mechanisms, and phytotoxic impacts is still lacking. In this work, wheat plants were exposed to pristine metallic (Ag-NPs) and sulfidized (Ag2S-NPs) silver nanoparticles and ionic Ag. Data on Ag distribution and speciation, phytotoxicity markers, and gene expression were studied. A multi-technique and multi-scale approach was applied, combining innovating tools at both the laboratory and synchrotron...
May 5, 2017: Environmental Science & Technology
https://www.readbyqxmd.com/read/28441590/screening-arabidopsis-mutants-in-genes-useful-for-phytoremediation
#11
María Sanz-Fernández, María Rodríguez-Serrano, Ana Sevilla-Perea, Liliana Pena, M Dolores Mingorance, Luisa M Sandalio, María C Romero-Puertas
Emissions of heavy metals have risen over the past 200 years and significantly exceed those from natural sources. Phytoremediation strategies may be able to recover soil productivity in self-sustaining ecosystems; however, our knowledge of the molecular mechanisms involved in plant heavy-metal perception and signalling is scarce. The aim of this study was to assemble a "molecular tool box" of genes useful for phytoremediation. To identify mutants with different heavy-metal-tolerance, we first selected a medium from mixtures containing three metals based on their presence in two Spanish mining areas and then screened about 7000 lines of Arabidopsis T-DNA mutants and found 74 lines more resistant and 56 more susceptible than the wild type (WT)...
April 7, 2017: Journal of Hazardous Materials
https://www.readbyqxmd.com/read/28439024/nip1-2-is-a-plasma-membrane-localized-transporter-mediating-aluminum-uptake-translocation-and-tolerance-in-arabidopsis
#12
Yuqi Wang, Ruihong Li, Demou Li, Xiaomin Jia, Dangwei Zhou, Jianyong Li, Sangbom M Lyi, Siyu Hou, Yulan Huang, Leon V Kochian, Jiping Liu
Members of the aquaporin (AQP) family have been suggested to transport aluminum (Al) in plants; however, the Al form transported by AQPs and the roles of AQPs in Al tolerance remain elusive. Here we report that NIP1;2, a plasma membrane-localized member of the Arabidopsis nodulin 26-like intrinsic protein (NIP) subfamily of the AQP family, facilitates Al-malate transport from the root cell wall into the root symplasm, with subsequent Al xylem loading and root-to-shoot translocation, which are critical steps in an internal Al tolerance mechanism in Arabidopsis We found that NIP1;2 transcripts are expressed mainly in the root tips, and that this expression is enhanced by Al but not by other metal stresses...
April 24, 2017: Proceedings of the National Academy of Sciences of the United States of America
https://www.readbyqxmd.com/read/28436673/unique-rhizosphere-microcharacteristics-facilitate-phytoextraction-of-multiple-metals-in-soil-by-the-hyperaccumulating-plant-sedum-alfredii
#13
Dandi Hou, Kai Wang, Ting Liu, Haixin Wang, Zhi Lin, Jie Qian, Lingli Lu, Shengke Tian
Understanding the strategies that the roots of hyperaccumulating plants use to extract heavy metals from soils is important for optimizing phytoremediation. The rhizosphere characteristics of Sedum alfredii, a hyperaccumulator, were investigated 6 months after it had been planted in weathered field soils contaminated with 5.8 μg of Cd g(-1), 1985.1 μg of Zn g(-1), 667.5 μg of Pb g(-1), and 698.8 μg of Cu g(-1). In contrast with the non-hyperaccumulating ecotype (NHE), the hyperaccumulating ecotype (HE) of S...
May 3, 2017: Environmental Science & Technology
https://www.readbyqxmd.com/read/28436146/improving-zinc-accumulation-in-barley-endosperm-using-hvmtp1-a-transition-metal-transporter
#14
Paloma Menguer, Thomas Vincent, Anthony J Miller, James K M Brown, Eva Vincze, Søren Borg, Preben Bach Holm, Dale Sanders, Dorina Podar
Zinc (Zn) is essential for all life forms, including humans. It is estimated that around two billion people are deficient in their Zn intake. Human dietary Zn intake relies heavily on plants, which in many developing countries consists mainly of cereals. The inner part of cereal grain, the endosperm, is the part that is eaten after milling but contains only a quarter of the total grain Zn. Here we present results demonstrating that endosperm Zn content can be enhanced through expression of a transporter responsible for vacuolar Zn accumulation in cereals...
April 24, 2017: Plant Biotechnology Journal
https://www.readbyqxmd.com/read/28430017/two-nramp6-isoforms-function-as-iron-and-manganese-transporters-and-contribute-to-disease-resistance-in-rice
#15
Cristina Peris-Peris, Albert Serra-Cardona, Ferrán Sánchez-Sanuy, Sonia Campo, Joaquin Ariño, Blanca San Segundo
Metal ions are essential elements for all living organisms. However, metals can be toxic when present in excess. In plants, metal homeostasis is partly achieved through the function of metal transporters, including the diverse natural resistance-associated macrophage proteins (NRAMP). Among them, the OsNramp6 gene encodes a previously uncharacterized member of the rice NRAMP family that undergoes alternative splicing to produce different NRAMP6 proteins. In this work, we determined the metal transport activity and biological role of the full-length and the shortest NRAMP6 proteins (l-NRAMP6 and s-NRAMP6, respectively)...
May 2017: Molecular Plant-microbe Interactions: MPMI
https://www.readbyqxmd.com/read/28428797/silicon-regulates-antioxidant-activities-of-crop-plants-under-abiotic-induced-oxidative-stress-a-review
#16
REVIEW
Yoon-Ha Kim, Abdul L Khan, Muhammad Waqas, In-Jung Lee
Silicon (Si) is the second most abundant element in soil, where its availability to plants can exhilarate to 10% of total dry weight of the plant. Si accumulation/transport occurs in the upward direction, and has been identified in several crop plants. Si application has been known to ameliorate plant growth and development during normal and stressful conditions over past two-decades. During abiotic (salinity, drought, thermal, and heavy metal etc) stress, one of the immediate responses by plant is the generation of reactive oxygen species (ROS), such as singlet oxygen ((1)O2), superoxide ([Formula: see text]), hydrogen peroxide (H2O2), and hydroxyl radicals (OH), which cause severe damage to the cell structure, organelles, and functions...
2017: Frontiers in Plant Science
https://www.readbyqxmd.com/read/28422193/challenges-in-developing-direct-carbon-fuel-cells
#17
REVIEW
Cairong Jiang, Jianjun Ma, Gael Corre, Sneh L Jain, John T S Irvine
A direct carbon fuel cell (DCFC) can produce electricity with both superior electrical efficiency and fuel utilisation compared to all other types of fuel cells. Although the first DCFC prototype was proposed in 1896, there was, until the 1970s, little sustained effort to investigate further, because of technology development issues. Interest in DCFCs has recently been reinvigorated as a possible method of replacing conventional coal-fired power plants to meet the demands for lower CO2 emissions, and indeed for efficient utilisation of waste derived chars...
April 19, 2017: Chemical Society Reviews
https://www.readbyqxmd.com/read/28421082/insights-into-the-structure-function-and-ion-mediated-signaling-pathways-transduced-by-plant-integrin-linked-kinases
#18
Sorina C Popescu, Elizabeth K Brauer, Gizem Dimlioglu, George V Popescu
Kinases facilitate detection of extracellular signals and set in motion cellular responses for plant adaptation and survival. Some of the energy utilized for kinase signal processing is produced through the activity of ion transporters. Additionally, the synergy between cellular ions and signal transduction influences plant response to pathogens, and their growth and development. In plants, the signaling elements that connect cell wall and membrane sensors with ion homeostasis and transport-mediated processes are largely unknown...
2017: Frontiers in Plant Science
https://www.readbyqxmd.com/read/28411572/adaptive-response-of-arbuscular-mycorrhizal-symbiosis-to-accumulation-of-elements-and-translocation-in-phragmites-australis-affected-by-cadmium-stress
#19
Xiaochen Huang, Shih-Hsin Ho, Shishu Zhu, Fang Ma, Jieting Wu, Jixian Yang, Li Wang
Arbuscular mycorrhizal (AM) fungi have been reported to play a central role in improving plant tolerance to cadmium (Cd)-contaminated sites. This is achieved by enhancing both the growth of host plants and the nutritive elements in plants. This study assessed potential regulatory effects of AM symbiosis with regard to nutrient uptake and transport, and revealed different response strategies to various Cd concentrations. Phragmites australis was inoculated with Rhizophagus irregularis in the greenhouse cultivation system, where it was treated with 0-20 mg L(-1) of Cd for 21days to investigate growth parameters, as well as Cd and nutritive element distribution in response to AM fungus inoculation...
April 12, 2017: Journal of Environmental Management
https://www.readbyqxmd.com/read/28394944/identification-of-a-rice-metal-tolerance-protein-osmtp11-as-a-manganese-transporter
#20
Mei Zhang, Baoxiu Liu
Metal tolerance proteins (MTPs) are a gene family of cation efflux transporters that occur widely in plants and might serve an essential role in metal homeostasis and tolerance. Our research describes the identification, characterization, and localization of OsMTP11, a member of the MTP family from rice. OsMTP11 was expressed constitutively and universally in different tissues in rice plant. Heterologous expression in yeast showed that OsMTP11 complemented the hypersensitivity of mutant strains to Mn, and also complemented yeast mutants to other metals, including Co and Ni...
2017: PloS One
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