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Metal transporter plant

Shimin Fu, Jonathan Shao, Changyong Zhou, John S Hartung
Citrus tristeza is one of the most destructive citrus diseases and is caused by the phloem-restricted Closterovirus, Citrus tristeza virus. Mild strain CTV-B2 does not cause obvious symptoms on indicators whereas severe strain CTV-B6 causes symptoms, including stem pitting, cupping, yellowing, and stiffening of leaves, and vein corking. Our laboratory has previously characterized changes in transcription in sweet orange separately infected with CTV-B2 and CTV-B6. In the present study, transcriptome analysis of Citrus sinensis in response to double infection by CTV-B2 and CTV-B6 was carried out...
2017: Frontiers in Plant Science
Manish Tiwari, Perumal Venkatachalam, Lola Penarrubia, Shivendra V Sahi
The mechanism of gold nanoparticle formation and genes involved in such processes, especially Au transport in plants are not understood. Previous reports pointed to the probable role of COPT2 in Au transport based on the transcript accumulation of COPT2 under Au exposure. Here, we provide evidence revealing the additional role of COPT2 for Au mobilization in yeast and Arabidopsis. The COPT2 transcripts significantly accumulated in the root of Arabidopsis under Au exposure. The expression of COPT2 restores Cu uptake ability in ctr1Δctr3Δ mutants and leads to Au sensitivity in yeast, which is comparable to Cu in growth kinetics experiments...
September 12, 2017: Scientific Reports
Jipeng Luo, Qi Tao, Keren Wu, Jinxing Li, Jie Qian, Yongchao Liang, Xiaoe Yang, Tingqiang Li
Interactions between roots and microbes affect plant's resistance to abiotic stress. However, the structural and functional variation of root-associated microbiomes and their effects on metal accumulation in hyperaccumulators remain poorly understood. Here, we characterize the root-associated microbiota of a hyperaccumulating (HP) and a non-hyperaccumulating (NHP) genotype of Sedum alfredii by 16S ribosomal RNA gene profiling. We show that distinct microbiomes are observed in four spatially separable compartments: the bulk soil, rhizosphere, rhizoplane, and endosphere...
September 11, 2017: Applied Microbiology and Biotechnology
Takeshi Senoura, Emi Sakashita, Takanori Kobayashi, Michiko Takahashi, May Sann Aung, Hiroshi Masuda, Hiromi Nakanishi, Naoko K Nishizawa
Rice OsYSL9 is a novel transporter for Fe(II)-nicotianamine and Fe(III)-deoxymugineic acid that is responsible for internal iron transport, especially from endosperm to embryo in developing seeds. Metal chelators are essential for safe and efficient metal translocation in plants. Graminaceous plants utilize specific ferric iron chelators, mugineic acid family phytosiderophores, to take up sparingly soluble iron from the soil. Yellow Stripe 1-Like (YSL) family transporters are responsible for transport of metal-phytosiderophores and structurally similar metal-nicotianamine complexes...
September 4, 2017: Plant Molecular Biology
Lu Qin, Peipei Han, Liyu Chen, Thomas C Walk, Yinshui Li, Xiaojia Hu, Lihua Xie, Hong Liao, Xing Liao
The NRAMP (natural resistance-associated macrophage protein) family of genes has been widely characterized in organisms ranging from bacteria to yeast, plants, mice, and humans. This gene family plays vital roles in divalent metal ion transport across cellular membranes. As yet, comprehensive analysis of NRAMP family genes has not been reported for soybean. In this study, bioinformatics analysis was conducted to identify 13 soybean NRAMP genes, along with their gene structures, phylogenetic relationships, and transmembrane domains...
2017: Frontiers in Plant Science
Jianxiang Feng, Yanyan Lin, Yao Yang, Qianqian Shen, Jianrong Huang, Shugong Wang, Xiaoshan Zhu, Zufu Li
In order to investigate the tolerance and bioaccumulation of Cd and Cu in the halophyte Sesuvium portulacastrum, seedlings were hydroponically cultured for 30 days using the modified 1/2 Hoagland nutrient solution with different concentrations of Cd (0, 5, 10, 15, and 20mgL(-1)) and Cu (0, 2.5, 5, 7.5, and 10mgL(-1)). Afterwards, the seedling height, leaf area, biomass, and mineral element contents (Fe, Mg, Cu, and Zn) in the roots, stems and leaves were measured, and the tolerance index, bioconcentration factor (BCF), transportation index, and removal rate were calculated...
August 28, 2017: Ecotoxicology and Environmental Safety
Premysl Landa, Pavel Dytrych, Sylva Prerostova, Sarka Petrova, Radomira Vankova, Tomas Vanek
Engineered nanoparticles (ENPs) exhibit unique properties advantageous in a number of applications, but they also represent potential health and environmental risks. In this study, we investigated the phytotoxic mechanism of CuO ENPs using transcriptomic analysis and compared this response with the response to CuO bulk particles and ionic Cu(2+). Ionic Cu(2+) at the concentration of 0.16 mg L(-1) changed transcription of 2692 genes (p value of <0.001, fold change of ≥2) after 7 days of exposure, whereas CuO ENPs and bulk particles (both in the concentration of 10 mg L(-1)) altered the expression of 922 and 482 genes in Arabidopsis thaliana roots, respectively...
September 7, 2017: Environmental Science & Technology
Saleh Shahabivand, Azar Parvaneh, Ali Asghar Aliloo
Cadmium (Cd) pollution in the soil threatens the quality of environmental health, and deleteriously affects physiological activities of crops. Symbiosis of endophytic fungi with various plants is a promising manner to improving numerous plant characteristics and remediating heavy metal-polluted soils. In this pot experiment, the influence of root endophyte fungus Piriformospora indica on growth, physiological parameters and organs Cd accumulation in sunflower cv. Zaria plants under the toxic levels of Cd (0, 40, 80 and 120mg/kg soil) were studied...
August 4, 2017: Ecotoxicology and Environmental Safety
Chun Chen, Olga V Tsyusko, Dave H McNear, Jonathan Judy, Ricky W Lewis, Jason M Unrine
Concern has grown regarding engineered nanomaterials (ENMs) entering agricultural soils through the application of biosolids and their possible effects on agroecosystems, even though the ENMs are extensively transformed. The effects of exposure to biosolids containing transformation products of these ENMs at low concentrations remain largely unexplored. We examined the responses of Medicago truncatula and its symbiotic rhizobia Sinorhizobium meliloti exposed to soil amended with biosolids from WWTP containing low added concentrations of ENMs (ENM Low), bulk/dissolved metals (bulk/dissolved Low), or no metal additions (control)...
December 31, 2017: Science of the Total Environment
Zhen Liu, Lei Wang, Chenye Wang, Shujuan Sun, Li Qin, Yi An, Yanshuai Xing, Hongwen Sun
Emerging contaminants that can complex with heavy metals might affect the speciation of coexisting metals and result in different ecological risks. As a widely used metal corrosion inhibitor, 1H-benzotriazole (BTR) is frequently detected in the environments, sometimes at very high levels. In this study, rice (Oryza sativa L.) was used to assess the ecological risk of combined exposure to cadmium (Cd) and BTR in plants and discuss the potential effects of exposure sequence on the uptake and translocation of Cd under hydroponic culture...
November 2017: Chemosphere
Isidro Abreu, Ángela Saéz, Rosario Castro-Rodríguez, Viviana Escudero, Benjamín Rodríguez-Haas, Marta Senovilla, Camille Larue, Daniel Grolimund, Manuel Tejada-Jiménez, Juan Imperial, Manuel González-Guerrero
Zinc is a micronutrient required for symbiotic nitrogen fixation. It has been proposed that in model legume Medicago truncatula, zinc is delivered by the root vasculature into the nodule and released in the infection/differentiation zone. There, transporters must introduce this element into rhizobia-infected cells to metallate the apoproteins that use zinc as a cofactor. MtZIP6 (Medtr4g083570) is a M. truncatula Zinc-Iron Permease (ZIP) that is expressed only in roots and nodules, with the highest expression levels in the infection/differentiation zone...
July 21, 2017: Plant, Cell & Environment
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
Juanjuan Feng, Weitao Jia, Sulian Lv, Hexigeduleng Bao, Fangfang Miao, Xuan Zhang, Jinhui Wang, Jihong Li, Dongsheng Li, Cheng Zhu, Shizhong Li, Yinxin Li
Cadmium (Cd) is a widespread soil contaminant threatening human health. As an ideal energy plant, sweet sorghum (Sorghum bicolor (L.) Moench) has great potential in phytoremediation of Cd-polluted soils, although the molecular mechanisms are largely unknown. In this study, key factors responsible for differential Cd accumulation between two contrasting sweet sorghum genotypes (high-Cd accumulation one H18, and low-Cd accumulation one L69) were investigated. H18 exhibited a much higher ability of Cd uptake and translocation than L69...
July 13, 2017: Plant Biotechnology Journal
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
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
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
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
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))...
December 15, 2017: Science of the Total Environment
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
Yanfei Ding, Yi Wang, Zhihua Jiang, Feijuan Wang, Qiong Jiang, Junwei Sun, Zhixiang Chen, Cheng Zhu
MicroRNAs (miRNAs) are 21-24-nucleotide-long 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 nonessential 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 miR268 in rice was significantly induced under Cd stress...
July 26, 2017: Journal of Agricultural and Food Chemistry
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