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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
#1
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
#2
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
#3
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
#4
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
#5
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
#6
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
#7
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
#8
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
#9
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
https://www.readbyqxmd.com/read/28574163/heavy-metal-atpase-3-hma3-confers-cadmium-hypertolerance-on-the-cadmium-zinc-hyperaccumulator-sedum-plumbizincicola
#10
Huan Liu, Haixia Zhao, Longhua Wu, Anna Liu, Fang-Jie Zhao, Wenzhong Xu
Cadmium (Cd) is highly toxic to most organisms, but some rare plant species can hyperaccumulate Cd in aboveground tissues without suffering from toxicity. The mechanism underlying Cd detoxification by hyperaccumulators is interesting but unclear. Here, the heavy metal ATPase 3 (SpHMA3) gene responsible for Cd detoxification was isolated from the Cd/zinc (Zn) hyperaccumulator Sedum plumbizincicola. RNA interference (RNAi)-mediated silencing and overexpression of SpHMA3 were induced to investigate its physiological functions in S...
June 2, 2017: New Phytologist
https://www.readbyqxmd.com/read/28555148/genome-wide-identification-of-orthologous-zip-genes-associated-with-zinc-and-iron-translocation-in-setaria-italica
#11
Ganesh Alagarasan, Mahima Dubey, Kumar S Aswathy, Girish Chandel
Genes in the ZIP family encode transcripts to store and transport bivalent metal micronutrient, particularly iron (Fe) and or zinc (Zn). These transcripts are important for a variety of functions involved in the developmental and physiological processes in many plant species, including most, if not all, Poaceae plant species and the model species Arabidopsis. Here, we present the report of a genome wide investigation of orthologous ZIP genes in Setaria italica and the identification of 7 single copy genes. RT-PCR shows 4 of them could be used to increase the bio-availability of zinc and iron content in grains...
2017: Frontiers in Plant Science
https://www.readbyqxmd.com/read/28525880/differential-sulphur-assimilation-mechanism-regulates-response-of-arabidopsis-thaliana-natural-variation-towards-arsenic-stress-under-limiting-sulphur-condition
#12
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
#13
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
#14
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
#15
William Shotyk, Peter G Appleby, Beatriz Bicalho, Lauren J Davies, Duane Froese, Iain Grant-Weaver, Gabriel Magnan, Gillian Mullan-Boudreau, Tommy Noernberg, Rick Pelletier, Bob 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, the largest reservoir of bitumen in the world. 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 element/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...
June 6, 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
#16
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
#17
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
#18
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
#19
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...
August 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
#20
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
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