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https://www.readbyqxmd.com/read/27931000/thorium-impact-on-tobacco-root-transcriptome
#1
Kateřina Mazari, Přemysl Landa, Sylva Přerostová, Karel Müller, Radomíra Vaňková, Petr Soudek, Tomáš Vaněk
Thorium is natural actinide metal with potential use in nuclear energetics. Contamination by thorium, originated from mining activities or spills, represents environmental risk due to its radioactivity and chemical toxicity. A promising approach for cleaning of contaminated areas is phytoremediation, which need to be based, however, on detail understanding of the thorium effects on plants. In this study we investigated transcriptomic response of tobacco roots exposed to 200μM thorium for one week. Thorium application resulted in up-regulation of 152 and down-regulation of 100 genes (p-value <0...
November 30, 2016: Journal of Hazardous Materials
https://www.readbyqxmd.com/read/27888434/a-novel-heavy-metal-atpase-peptide-from-prosopis-juliflora-is-involved-in-metal-uptake-in-yeast-and-tobacco
#2
Nisha S Keeran, G Ganesan, Ajay K Parida
Heavy metal pollution of agricultural soils is one of the most severe ecological problems in the world. Prosopis juliflora, a phreatophytic tree species, grows well in heavy metal laden industrial sites and is known to accumulate heavy metals. Heavy Metal ATPases (HMAs) are ATP driven heavy metal pumps that translocate heavy metals across biological membranes thus helping the plant in heavy metal tolerance and phytoremediation. In the present study we have isolated and characterized a novel 28.9 kDa heavy metal ATPase peptide (PjHMT) from P...
November 25, 2016: Transgenic Research
https://www.readbyqxmd.com/read/27880006/impairing-both-hma4-homeologs-is-required-for-cadmium-reduction-in-tobacco
#3
Verena Liedschulte, Hélène Laparra, James Nicolas Duncan Battey, Joanne Deborah Schwaar, Hervé Broye, Régis Mark, Markus Klein, Simon Goepfert, Lucien Bovet
In tobacco, the heavy metal P1B-ATPases HMA4.1 and HMA4.2 function in root-to-shoot zinc and cadmium transport. We present greenhouse and field data that dissect the possibilities to impact the two homeologous genes in order to define the best strategy for leaf cadmium reduction. In a first step, both genes were silenced using an RNAi approach leading to >90% reduction of leaf cadmium content. To modulate HMA4 function more precisely, mutant HMA4.1 and HMA4.2 alleles of a TILLING population were combined...
November 23, 2016: Plant, Cell & Environment
https://www.readbyqxmd.com/read/27877177/comparative-transcriptomic-analyses-of-differentially-expressed-genes-in-transgenic-melatonin-biosynthesis-ovine-hiomt-gene-in-switchgrass
#4
Shan Yuan, Cong Guan, Sijia Liu, Yanhua Huang, Danyang Tian, Xin Cui, Yunwei Zhang, Fuyu Yang
Melatonin serves pleiotropic functions in prompting plant growth and resistance to various stresses. The accurate biosynthetic pathway of melatonin remains elusive in plant species, while the N-acetyltransferase and O-methyltransferase were considered to be the last two key enzymes during its biosynthesis. To investigate the biosynthesis and metabolic pathway of melatonin in plants, the RNA-seq profile of overexpression of the ovine HIOMT was analyzed and compared with the previous transcriptome of transgenic oAANAT gene in switchgrass, a model plant for cellulosic ethanol production...
2016: Frontiers in Plant Science
https://www.readbyqxmd.com/read/27837364/translocation-of-metal-ions-from-soil-to-tobacco-roots-and-their-concentration-in-the-plant-parts
#5
Cleber Pinto da Silva, Thiago E de Almeida, Rosimara Zittel, Tatiana R de Oliveira Stremel, Cinthia E Domingues, Januário Kordiak, Sandro Xavier de Campos
This paper presents a study on the translocation factors (TFs) and bioconcentration factors (BCFs) of copper (Cu), manganese (Mn), zinc (Zn), cobalt (Co), chromium (Cr), cadmium (Cd), lead (Pb), iron (Fe), nickel (Ni), and arsenic (As) ions in roots, stems, and leaves of tobacco. The results revealed that during the tobacco growth, the roots are able to increase the sensitiveness of the physiological control, reducing the translocation of the metals Ni (0.38) and Pb (0.48) to the leaves. Cd and Zn presented factors TF and BCF >1 in the three tissues under analysis, which indicates the high potential for transportation and accumulation of these metals in all plant tissues...
December 0: Environmental Monitoring and Assessment
https://www.readbyqxmd.com/read/27799422/monensin-sensitivity-1-mon1-calcium-caffeine-zinc-sensitivity-1-ccz1-mediated-rab7-activation-regulates-tapetal-programmed-cell-death-and-pollen-development
#6
Yong Cui, Qiong Zhao, Hong-Tao Xie, Wing Shing Wong, Xiangfeng Wang, Caiji Gao, Yu Ding, Yuqi Tan, Takashi Ueda, Yan Zhang, Liwen Jiang
Program cell death (PCD)-triggered degradation of plant tapetum is essential for microspore development and pollen coat formation, however, little is known about the cellular mechanism regulating tapetal PCD. Here, we demonstrate that Rab7-mediated vacuolar transport of tapetum degradation-related cysteine proteases is crucial for tapetal PCD and pollen development in Arabidopsis, with the following evidence: 1) The mon1 mutants, which are defective in Rab7 activation, showed impaired male fertility due to a combined defect in both tapetum and male gametophyte development; 2) In anthers, MON1 showed preferential high level expression in tapetal cell layers and pollen; 3) The mon1 mutants exhibited delayed tapetum degeneration and tapetal PCD, resulting in abnormal pollen coat formation and decreased male fertility; 4) MON1/CCZ1-mediated Rab7 activation was indispensable for vacuolar trafficking of tapetum degradation-related cysteine proteases, supporting that PCD-triggered tapetum degeneration requires Rab7-mediated vacuolar trafficking of these cysteine proteases; and 5) MON1 mutations also resulted in defective pollen germination and tube growth...
October 31, 2016: Plant Physiology
https://www.readbyqxmd.com/read/27734509/zinc-hyperaccumulation-substitutes-for-defense-failures-beyond-salicylate-and-jasmonate-signaling-pathways-of-alternaria-brassicicola-attack-in-noccaea-caerulescens
#7
Berta Gallego, Soledad Martos, Catalina Cabot, Juan Barceló, Charlotte Poschenrieder
The hypothesis of metal defense as a substitute for a defective biotic stress signaling system in metal hyperaccumulators was tested using the pathosystem Alternaria brassicicola - Noccaea caerulescens under low (2 μM), medium (12 μM), and high (102 μM) Zn supply. Regardless the Zn supply, N. caerulescens responded to fungal attack with the activation of both HMA4 coding for a Zn transporter, and biotic stress signaling pathways. Salicylate, jasmonate, abscisic acid, and indoleacetic acid concentrations, as well as biotic stress marker genes (PDF1...
October 13, 2016: Physiologia Plantarum
https://www.readbyqxmd.com/read/27729476/analysis-of-high-iron-rice-lines-reveals-new-mirnas-that-target-iron-transporters-in-roots
#8
Soumitra Paul, Dipak Gayen, Swapan K Datta, Karabi Datta
The present study highlights the molecular regulation of iron transport in soyFER1-overexpressing transgenic rice. Accumulation of iron in three different seed developmental stages, milk, dough, and mature, has been examined. The transgenic seeds of the milk stage showed significant augmentation of iron and zinc levels compared with wild-type seeds, and similar results were observed throughout the dough and mature stages. To investigate the regulation of iron transport, the role of miRNAs was studied in roots of transgenic rice...
October 2016: Journal of Experimental Botany
https://www.readbyqxmd.com/read/27633505/the-expression-of-heterologous-fe-iii-phytosiderophore-transporter-hvys1-in-rice-increases-fe-uptake-translocation-and-seed-loading-and-excludes-heavy-metals-by-selective-fe-transport
#9
Raviraj Banakar, Ána Alvarez Fernández, Javier Abadía, Teresa Capell, Paul Christou
Many metal transporters in plants are promiscuous, accommodating multiple divalent cations including some which are toxic to humans. Previous attempts to increase the iron (Fe) and zinc (Zn) content of rice endosperm by overexpressing different metal transporters have therefore led unintentionally to the accumulation of copper (Cu), manganese (Mn) and cadmium (Cd). Unlike other metal transporters, barley Yellow Stripe 1 (HvYS1) is specific for Fe. We investigated the mechanistic basis of this preference by constitutively expressing HvYS1 in rice under the control of the maize ubiquitin1 promoter and comparing the mobilization and loading of different metals...
September 16, 2016: Plant Biotechnology Journal
https://www.readbyqxmd.com/read/27602024/the-regulatory-protein-rosr-affects-rhizobium-leguminosarum-bv-trifolii-protein-profiles-cell-surface-properties-and-symbiosis-with-clover
#10
Kamila Rachwał, Aleksandra Boguszewska, Joanna Kopcińska, Magdalena Karaś, Marek Tchórzewski, Monika Janczarek
Rhizobium leguminosarum bv. trifolii is capable of establishing a symbiotic relationship with plants from the genus Trifolium. Previously, a regulatory protein encoded by rosR was identified and characterized in this bacterium. RosR possesses a Cys2-His2-type zinc finger motif and belongs to Ros/MucR family of rhizobial transcriptional regulators. Transcriptome profiling of the rosR mutant revealed a role of this protein in several cellular processes, including the synthesis of cell-surface components and polysaccharides, motility, and bacterial metabolism...
2016: Frontiers in Microbiology
https://www.readbyqxmd.com/read/27593943/effects-of-different-sewage-sludge-applications-on-heavy-metal-accumulation-growth-and-yield-of-spinach-spinacia-oleracea-l
#11
Ebrahem M Eid, Ahmed F El-Bebany, Sulaiman A Alrumman, Abd El-Latif Hesham, Mostafa A Taher, Khaled F Fawy
In this study, we present the response of spinach to different amendment rates of sewage sludge (0, 10, 20, 30, 40 and 50 g kg(-1)) in a greenhouse pot experiment, where plant growth, biomass and heavy metal uptake were measured. The results showed that sewage sludge application increased soil EC, organic matter, chromium and zinc concentrations and decreased soil pH. All heavy metal concentrations of the sewage sludge were below the permissible limits for land application of sewage sludge recommended by the Council of the European Communities...
September 3, 2016: International Journal of Phytoremediation
https://www.readbyqxmd.com/read/27591370/transcriptional-up-regulation-of-genes-involved-in-photosynthesis-of-the-zn-cd-hyperaccumulator-sedum-alfredii-in-response-to-zinc-and-cadmium
#12
Lu Tang, Aijun Yao, Ming Yuan, Yetao Tang, Jian Liu, Xi Liu, Rongliang Qiu
Zinc (Zn) and cadmium (Cd) are two closely related chemical elements with very different biological roles in photosynthesis. Zinc plays unique biochemical functions in photosynthesis. Previous studies suggested that in some Zn/Cd hyperaccumulators, many steps in photosynthesis may be Cd tolerant or even Cd stimulated. Using RNA-seq data, we found not only that Cd and Zn both up-regulated the CA1 gene, which encodes a β class carbonic anhydrase (CA) in chloroplasts, but that a large number of other Zn up-regulated genes in the photosynthetic pathway were also significantly up-regulated by Cd in leaves of the Zn/Cd hyperaccumulator Sedum alfredii...
December 2016: Chemosphere
https://www.readbyqxmd.com/read/27590015/genome-based-insights-into-the-resistome-and-mobilome-of-multidrug-resistant-aeromonas-sp-arm81-isolated-from-wastewater
#13
Marcin Adamczuk, Lukasz Dziewit
The draft genome of multidrug-resistant Aeromonas sp. ARM81 isolated from a wastewater treatment plant in Warsaw (Poland) was obtained. Sequence analysis revealed multiple genes conferring resistance to aminoglycosides, β-lactams or tetracycline. Three different β-lactamase genes were identified, including an extended-spectrum β-lactamase gene bla PER-1. The antibiotic susceptibility was experimentally tested. Genome sequencing also allowed us to investigate the plasmidome and transposable mobilome of ARM81...
September 2, 2016: Archives of Microbiology
https://www.readbyqxmd.com/read/27566167/multi-element-bioimaging-of-arabidopsis-thaliana-roots
#14
Daniel Pergament Persson, Anle Chen, Mark G M Aarts, David E Salt, Jan K Schjoerring, Søren Husted
Better understanding of root function is central for the development of plants with more efficient nutrient uptake and translocation. We here present a method for multielement bioimaging at the cellular level in roots of the genetic model system Arabidopsis (Arabidopsis thaliana). Using conventional protocols for microscopy, we observed that diffusible ions such as potassium and sodium were lost during sample dehydration. Thus, we developed a protocol that preserves ions in their native, cellular environment...
October 2016: Plant Physiology
https://www.readbyqxmd.com/read/27547212/regulating-subcellular-metal-homeostasis-the-key-to-crop-improvement
#15
REVIEW
Khurram Bashir, Sultana Rasheed, Takanori Kobayashi, Motoaki Seki, Naoko K Nishizawa
Iron (Fe), zinc (Zn), manganese (Mn), and copper (Cu) are essential micronutrient mineral elements for living organisms, as they regulate essential cellular processes, such as chlorophyll synthesis and photosynthesis (Fe, Cu, and Mn), respiration (Fe and Cu), and transcription (Zn). The storage and distribution of these minerals in various cellular organelles is strictly regulated to ensure optimal metabolic rates. Alteration of the balance in uptake, distribution, and/or storage of these minerals severely impairs cellular metabolism and significantly affects plant growth and development...
2016: Frontiers in Plant Science
https://www.readbyqxmd.com/read/27524990/transition-metal-transport-in-plants-and-associated-endosymbionts-arbuscular-mycorrhizal-fungi-and-rhizobia
#16
REVIEW
Manuel González-Guerrero, Viviana Escudero, Ángela Saéz, Manuel Tejada-Jiménez
Transition metals such as iron, copper, zinc, or molybdenum are essential nutrients for plants. These elements are involved in almost every biological process, including photosynthesis, tolerance to biotic and abiotic stress, or symbiotic nitrogen fixation. However, plants often grow in soils with limiting metallic oligonutrient bioavailability. Consequently, to ensure the proper metal levels, plants have developed a complex metal uptake and distribution system, that not only involves the plant itself, but also its associated microorganisms...
2016: Frontiers in Plant Science
https://www.readbyqxmd.com/read/27448721/physiological-and-molecular-responses-to-heavy-metal-stresses-suggest-different-detoxification-mechanism-of-populus-deltoides-and-p-x-canadensis
#17
Dániel Benyó, Edit Horváth, Edit Németh, Tünde Leviczky, Kinga Takács, Nóra Lehotai, Gábor Feigl, Zsuzsanna Kolbert, Attila Ördög, Róbert Gallé, Jolán Csiszár, László Szabados, László Erdei, Ágnes Gallé
Plants have divergent defense mechanisms against the harmful effects of heavy metals present in excess in soils and groundwaters. Poplars (Populus spp.) are widely cultivated because of their rapid growth and high biomass production, and members of the genus are increasingly used as experimental model organisms of trees and for phytoremediation purposes. Our aim was to investigate the copper and zinc stress responses of three outstanding biomass producer bred poplar lines to identify such transcripts of genes involved in the detoxification mechanisms, which can play an important role in the protection against heavy metals...
August 20, 2016: Journal of Plant Physiology
https://www.readbyqxmd.com/read/27359107/zinc-isotope-fractionation-in-the-hyperaccumulator-noccaea-caerulescens-and-the-nonaccumulating-plant-thlaspi-arvense-at-low-and-high-zn-supply
#18
Ye-Tao Tang, Christophe Cloquet, Teng-Hao-Bo Deng, Thibault Sterckeman, Guillaume Echevarria, Wen-Jun Yang, Jean-Louis Morel, Rong-Liang Qiu
On the basis of our previous field survey, we postulate that the pattern and degree of zinc (Zn) isotope fractionation in the Zn hyperaccumulator Noccaea caerulescens (J. & C. Presl) F. K. Mey may reflect a relationship between Zn bioavailability and plant uptake strategies. Here, we investigated Zn isotope discrimination during Zn uptake and translocation in N. caerulescens and in a nonaccumulator Thlaspi arvense L. with a contrasting Zn accumulation ability in response to low (Zn-L) and high (Zn-H) Zn supplies...
August 2, 2016: Environmental Science & Technology
https://www.readbyqxmd.com/read/27318481/morphophysiological-characteristic-analysis-demonstrated-the-potential-of-sweet-sorghum-sorghum-bicolor-l-moench-in-the-phytoremediation-of-cadmium-contaminated-soils
#19
Weitao Jia, Sulian Lv, Juanjuan Feng, Jihong Li, Yinxin Li, Shizhong Li
Cadmium (Cd) contamination is a worldwide environmental problem, and remediation of Cd pollution is of great significance for food production as well as human health. Here, the responses of sweet sorghum cv. 'M-81E' to cadmium stress were studied for its potential as an energy plant in restoring soils contaminated by cadmium. In hydroponic experiments, the biomass of 'M-81E' showed no obvious change under 10 μM cadmium treatment. Cadmium concentration was the highest in roots of seedlings as well as mature plants, but in agricultural practice, the valuable and harvested parts of sweet sorghum are shoots, so promoting the translocation of cadmium to shoots is of great importance in order to improve its phytoremediation capacity...
September 2016: Environmental Science and Pollution Research International
https://www.readbyqxmd.com/read/27243644/mother-plant-mediated-pumping-of-zinc-into-the-developing-seed
#20
Lene Irene Olsen, Thomas H Hansen, Camille Larue, Jeppe Thulin Østerberg, Robert D Hoffmann, Johannes Liesche, Ute Krämer, Suzy Surblé, Stéphanie Cadarsi, Vallerie Ann Samson, Daniel Grolimund, Søren Husted, Michael Palmgren
Insufficient intake of zinc and iron from a cereal-based diet is one of the causes of 'hidden hunger' (micronutrient deficiency), which affects some two billion people(1,2). Identifying a limiting factor in the molecular mechanism of zinc loading into seeds is an important step towards determining the genetic basis for variation of grain micronutrient content and developing breeding strategies to improve this trait(3). Nutrients are translocated to developing seeds at a rate that is regulated by transport processes in source leaves, in the phloem vascular pathway, and at seed sinks...
2016: Nature Plants
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