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https://www.readbyqxmd.com/read/30316153/ectomycorrhizal-fungi-may-not-act-as-a-barrier-inhibiting-host-plant-absorption-of-heavy-metals
#1
Yangze Tang, Liang Shi, Kecheng Zhong, Zhenguo Shen, Yahua Chen
Whether the huge external hyphal system of ectomycorrhizae that promotes host plants' acquisition of water and nutrients can selectively inhibit their transport of heavy metals at the same time remains unclear. In this experiment, we designed and conducted two types of soil-pot test to clarify the effects of EMF on the absorption and transport of copper (Cu) and cadmium (Cd) by host Pinus thunbergii seedlings. In the root-bag test, external hyphae took the initiative into the Cu/Cd-contaminated bulk soil, absorb and transport Cu and Cd to the rhizosphere soils and further transport it to the shoots of the host plants...
October 4, 2018: Chemosphere
https://www.readbyqxmd.com/read/30312968/a-stress-associated-protein-lmsap-from-the-halophyte-lobularia-maritima-provides-tolerance-to-heavy-metals-in-tobacco-through-increased-ros-scavenging-and-metal-detoxification-processes
#2
Rania Ben Saad, Anis Ben Hsouna, Walid Saibi, Karim Ben Hamed, Faical Brini, Thaura Ghneim-Herrera
Agricultural soil pollution by heavy metals is a severe global ecological problem. We recently showed that overexpression of LmSAP, a member of the stress-associated protein (SAP) gene family isolated from Lobularia maritima, in transgenic tobacco led to enhanced tolerance to abiotic stress. In this study, we characterised the response of LmSAP transgenic tobacco plants to metal stresses (cadmium (Cd), copper (Cu), manganese (Mn), and zinc (Zn)). In L. maritima, LmSAP expression increased after 12 h of treatment with these metals, suggesting its involvement in the plant response to heavy metal stress...
September 29, 2018: Journal of Plant Physiology
https://www.readbyqxmd.com/read/30312890/identification-and-comprehensive-analysis-of-the-characteristics-and-roles-of-leucine-rich-repeat-receptor-like-protein-kinase-lrr-rlk-genes-in-sedum-alfredii-hance-responding-to-cadmium-stress
#3
Xuelian He, Tongyu Feng, Dayi Zhang, Renying Zhuo, Mingying Liu
Sedum alfredii Hance is a Zn/Cd co-hyperaccumulator and its underlying molecular mechanism of Cd tolerance is worthy to be elucidated. Although numerous studies have reported the uptake, sequestration and detoxification of Cd in S. alfredii Hance, how it senses Cd-stress stimuli and transfers signals within tissues remains unclear. Leucine-rich repeat receptor-like protein kinases (LRR-RLKs) are vital for plant growth, development, immunity and signal transduction. Till now, there is lack of comprehensive studies addressing their functions in S...
October 9, 2018: Ecotoxicology and Environmental Safety
https://www.readbyqxmd.com/read/30311662/the-wrky-transcription-factor-wrky13-activates-pdr8-expression-to-positively-regulate-cadmium-tolerance-in-arabidopsis
#4
Yibao Sheng, Xingxing Yan, Ying Huang, Yangyang Han, Cheng Zhang, Yongbing Ren, Tingting Fan, Fangming Xiao, Yongsheng Liu, Shuqing Cao
Cadmium (Cd) extrusion is an important mechanism conferring Cd tolerance by decreasing its accumulation in plants. Previous studies have identified an Arabidopsis ABC transporter, PDR8, as a Cd extrusion pump conferring Cd tolerance. However, the regulation of PDR8 in response to Cd stress is still largely unknown. In this study, we identified an Arabidopsis cadmium-tolerant dominant mutant, designated xcd3-D, from the XVE-tagging T-DNA insertion lines by a gain-of-function genetic screen. The corresponding gene was cloned and shown to encode a nuclear WRKY transcription factor WRKY13...
October 12, 2018: Plant, Cell & Environment
https://www.readbyqxmd.com/read/30310947/metal-tolerance-capability-of-helichrysum-microphyllum-cambess-subsp-tyrrhenicum-bacch-brullo-giusso-a-candidate-for-phytostabilization-in-abandoned-mine-sites
#5
G Bacchetta, M E Boi, G Cappai, G De Giudici, M Piredda, M Porceddu
Sardinia was known as an important mine pole in Europe during his history. Still after decades from mine closure, 75.000.000 m3 of mine waste, rich in heavy metals, were left abandoned causing a huge environmental legacy on the mine district area. Consequently, cost effective remediation is required. In this frame, phytoremediation is considered a feasible candidate. This research was focused on Helichrysum microphyllum subsp. tyrrhenicum, which is pioneer in xeric soils with low-functions, like mine tailings...
October 11, 2018: Bulletin of Environmental Contamination and Toxicology
https://www.readbyqxmd.com/read/30308892/cadmium-accumulation-capacity-and-resistance-strategies-of-a-cadmium-hypertolerant-fern-microsorum-fortunei
#6
Yun-Yun Yan, Bin Yang, Xin-Yu Lan, Xin-Yuan Li, Fu-Liu Xu
Microsorum fortunei (M. fortunei), a close relative to the cadmium (Cd) hyperaccumulator Microsorum pteropus, is an epiphytic Polypodiaceae fern with strong antioxidant activity. The Cd-accumulation capacities and Cd-resistance mechanisms of M. fortunei were analyzed in this study by measuring metal contents (Cd, Fe, Mg, Ca, Zn, Mn, K and Na) and chlorophyll fluorescence parameters (Fv /Fm , qN, qP, Y(II), Y(NPQ) and Y(NO)) and by performing an RNA-sequencing analysis. M. fortunei could accumulate up to 2249...
February 1, 2019: Science of the Total Environment
https://www.readbyqxmd.com/read/30305995/-dreb2-dehydration-responsive-element-binding-protein-2-type-transcription-factor-in-sorghum-sorghum-bicolor-genome-wide-identification-characterization-and-expression-profiles-under-cadmium-and-salt-stresses
#7
M Aydın Akbudak, Ertugrul Filiz, Kubra Kontbay
Biotic and abiotic stresses negatively affect fitness, biomass production, and crop yield in plants. The dehydration-responsive element-binding proteins ( DREB ) are important transcription factors (TFs), and are induced by abiotic and biotic stresses. In this study, genome-wide identification, in silico sequence, and phylogenetic analyses and expression analyses of DREB2 genes under cadmium (Cd) and salt (NaCl) stresses in sorghum ( Sorghum bicolor , Sb ) were performed. Six putative SbDREB2 genes were identified in sorghum genome and all contained AP2 domain (PF00847)...
October 2018: 3 Biotech
https://www.readbyqxmd.com/read/30297625/silicon-mediated-enhancement-of-heavy-metal-tolerance-in-rice-at-different-growth-stages
#8
Fei Huang, Xiao-Hui Wen, Yi-Xia Cai, Kun-Zheng Cai
Silicon (Si) plays important roles in alleviating heavy metal stress in rice plants. Here we investigated the physiological response of rice at different growth stages under the silicon-induced mitigation of cadmium (Cd) and zinc (Zn) toxicity. Si treatment increased the dry weight of shoots and roots and reduced the Cd and Zn concentrations in roots, stems, leaves and grains. Under the stress of exposure to Cd and Zn, photosynthetic parameters including the chlorophyll content and chlorophyll fluorescence decreased, while the membrane permeability and malondialdehyde (MDA) increased...
October 8, 2018: International Journal of Environmental Research and Public Health
https://www.readbyqxmd.com/read/30292971/exogenous-foliar-application-of-fulvic-acid-alleviate-cadmium-toxicity-in-lettuce-lactuca-sativa-l
#9
Yanmei Wang, Ruixi Yang, Jiaying Zheng, Zhenguo Shen, Xiaoming Xu
It was reported that fulvic acid (FA) has a positive effect on enhancing plant tolerance to various environmental stresses, including salinity stress and drought stress and so on. However, there is little study regarding the effects of FA on plants in response to heavy metal stress. Hence, the objective of this study was to investigate the potential effects of fulvic acid (FA) on cadmium (Cd) toxicity alleviation in lettuce seedlings. Our results showed that application of 0.5 g/L FA significantly mitigate Cd-induced toxic symptoms in lettuce seedlings...
October 4, 2018: Ecotoxicology and Environmental Safety
https://www.readbyqxmd.com/read/30280336/metals-in-a-northern-nile-delta-lake-water-suspended-particulates-sediments-and-biota
#10
Mohamed A Okbah, Ahmed M Abdelhalim, Mohamed A Abu El-Regal, Naglaa F Soliman, Mohammed E M Nassar
Lake Edku is one of the important fishing areas in the Nile Delta. It is exposed to different quantities of serious pollutants in particular metals. To overall appraise the risk and status of metals in the lake, a comprehensive study of total concentrations of cadmium (Cd), chromium (Cr), copper (Cu), iron (Fe), manganese (Mn), nickel (Ni), and zinc (Zn) in sediments and spatial-temporal variations of these metals in the dissolved and suspended particulates, and some tissues of Tilapias niloticus, was conducted from ten sampling sites during 2016...
October 2, 2018: Environmental Science and Pollution Research International
https://www.readbyqxmd.com/read/30278354/effects-of-ocean-warming-and-acidification-on-accumulation-and-cellular-responsiveness-to-cadmium-in-mussels-mytilus-galloprovincialis-importance-of-the-seasonal-status
#11
Alessandro Nardi, Maura Benedetti, Giuseppe d'Errico, Daniele Fattorini, Francesco Regoli
Ocean warming and acidification could represent an additional threat to marine organisms already coping with other anthropogenic impacts, such as chemical contamination in coastal areas. In this study, interactions between such multiple stressors and their synergistic effects in terms of accumulation, detoxification and biological effects of metals were investigated in the Mediterranean mussel Mytilus galloprovincialis. Organisms sampled during the winter period were exposed for 28 days to different combinations of two temperatures (10 °C and 15 °C), two pH/pCO2 (8...
September 18, 2018: Aquatic Toxicology
https://www.readbyqxmd.com/read/30278125/coopting-the-lap-system-of-pseudomonas-fluorescens-to-reversibly-customize-bacterial-cell-surfaces
#12
T Jarrod Smith, Holger Sondermann, George A O'Toole
Initial attachment to a surface is a key and highly regulated step in biofilm formation. In this study, we present a platform for reversibly functionalizing bacterial cell surfaces, with an emphasis on designing biofilms. We engineered the Lap system of Pseudomonas fluorescens Pf0-1, which is normally used to regulate initial cell surface attachment, to display various protein cargo at the bacterial cell surface and control extracellular release of the cargo in response to changing levels of the second messenger c-di-GMP...
October 2, 2018: ACS Synthetic Biology
https://www.readbyqxmd.com/read/30276702/sulfate-supply-enhances-cadmium-tolerance-in-vicia-faba-l-plants
#13
Jiawen Wu, Hans-Peter Mock, Karl-Hermann Mühling
Sulfur deficiency and cadmium (Cd) pollution are two ubiquitous constraints affecting plant growth in agricultural soils. However, facing the situation of sulfur deficiency, whether surplus sulfate supply can affect Cd toxicity in plants is still unclear. Therefore, in the present study, experiments with deficient, sufficient, and excess sulfate levels under Cd stress were conducted in faba bean plants hydroponically. We found that sulfate supply significantly increased biomass of Cd-stressed plants when compared with deficient sulfate treatment...
October 2, 2018: Environmental Science and Pollution Research International
https://www.readbyqxmd.com/read/30276423/heavy-metal-accumulation-in-lathyrus-sativus-growing-in-contaminated-soils-and-identification-of-symbiotic-resistant-bacteria
#14
Souhir Abdelkrim, Salwa Harzalli Jebara, Omar Saadani, Manel Chiboub, Ghassen Abid, Khediri Mannai, Moez Jebara
In this study, two populations of leguminous plants Lathyrus sativus were grown in four soils that were collected from sites differently contaminated by heavy metals. Evaluations included basic soil properties, concentrations of major nutrients and four metals (copper, zinc, lead and cadmium) in these soils. Investigation of Lathyrus sativus response to contamination showed that the increase of heavy metal concentration in soils affected biomass of plant, number of nodules and plant metal uptake. Heavy metal tolerance of 46 isolated bacteria from the root nodules was evaluated and demonstrated that the maximum concentration of Cd, Pb, Cu and Zn tolerated by strains were 0...
October 1, 2018: Archives of Microbiology
https://www.readbyqxmd.com/read/30272967/hyperaccumulator-plants-from-china-a-synthesis-of-the-current-state-of-knowledge
#15
Jin-Tian Li, Hanumanth Kumar Gurajala, Longhua Wu, Antony van der Ent, Rong-Liang Qiu, Alan John Martin Baker, Ye-Tao Tang, Xiaoe Yang, Wensheng Shu
Hyperaccumulator plants are the material basis for phytoextraction research and for practical applications in decontaminating polluted soils and industrial wastes. China's high biodiversity and substantial mineral resources make it a global hotspot for hyperaccumulator plant species. Intensive screening efforts over the past 20 years by researchers working in China have led to the discovery of many different hyperaccumulators for a range of elements. In this review, we present the state of knowledge on all currently reported hyperaccumulator species from China, including Cardamine violifolia (selenium, Se), Dicranopteris dichotoma (rare earth elements, REEs), Elsholtzia splendens (copper, Cu), Phytolacca americana (manganese, Mn), Pteris vittata (arsenic, As), Sedum alfredii and Sedum plumbizicola (cadmium/zinc, Cd/Zn)...
October 1, 2018: Environmental Science & Technology
https://www.readbyqxmd.com/read/30269017/exogenous-citrate-and-malate-alleviate-cadmium-stress-in-oryza-sativa-l-probing-role-of-cadmium-localization-and-iron-nutrition
#16
Abin Sebastian, M N V Prasad
Organic acids play an important role in metal uptake and trafficking in plants. Therefore, the role of exogenous citrate and malate on Cd tolerance was studied in the seedlings of Oryza sativa L. cv MTU 7029. Seedlings were exposed to Cd plus organic acids in hydroponics and monitored changes in Cd accumulation, expression of metal transporters, chlorophyll fluorescence, and antioxidants. It found that organic acid supplements decrease Cd accumulation in leaf because of up-regulation of tonoplast localized heavy metal ATPase (OsHMA3) which allows vacuolar sequestration of Cd in the root...
September 27, 2018: Ecotoxicology and Environmental Safety
https://www.readbyqxmd.com/read/30266832/structural-and-functional-characterization-of-the-transcriptional-regulator-rv3488-of-mycobacterium-tuberculosis-h37rv
#17
Meera Kumari, Ravi Kant Pal, Alok K Mishra, Sarita Tripathi, Bichitra Kumar Biswal, Kishore K Srivastava, Ashish Arora
Rv3488 of Mycobacterium tuberculosis H37Rv has been assigned to the phenolic acid decarboxylase repressor (PadR) family of transcriptional regulators that play key roles in multi-drug resistance and virulence of prokaryotes. The binding of cadmium, zinc, and several other metals to Rv3488 was discovered and characterized by ITC to be an exothermic process. Crystal structures of apo-Rv3488 and Rv3488 in complex with cadmium or zinc ions were determined by X-ray crystallography. Structure of Rv3488 revealed a dimeric protein with N-terminal winged-helix-turn-helix DNA-binding domains composed of helices α1, α2, α3, strand β1 and β2, with the dimerization interface being formed of helices α4 and α1...
September 28, 2018: Biochemical Journal
https://www.readbyqxmd.com/read/30259382/cadmium-toxicity-degree-on-tomato-development-is-associated-with-disbalances-in-b-and-mn-status-at-early-stages-of-plant-exposure
#18
Marcia Eugenia Amaral Carvalho, Fernando Angelo Piotto, Mônica Regina Franco, Karina Lima Reis Borges, Salete Aparecida Gaziola, Paulo Roberto Camargo Castro, Ricardo Antunes Azevedo
Cadmium (Cd) toxicity is frequently coupled to its accumulation in plants, but not always the highest Cd concentration triggers the worst damages, indicating that additional events influence the magnitude of Cd side-effects. We investigated the early mechanisms behind the differential Cd-induced impacts on plant development of four tomato accessions with contrasting tolerance to Cd toxicity. At organ level, the highest Cd concentration was not associated with the largest biomass losses. In leaves, changes in superoxide dismutase and catalase activities were not related to differences in Cd concentration, which was unable to provoke H2 O2 overproduction on the sixth day of plant exposure to this metal...
September 26, 2018: Ecotoxicology
https://www.readbyqxmd.com/read/30259326/the-effect-of-hydro-and-proline-seed-priming-on-growth-proline-and-sugar-content-and-antioxidant-activity-of-maize-under-cadmium-stress
#19
Erna Karalija, Alisa Selović
We tested the effect of seed hydro- and proline-priming on cadmium (Cd) tolerance in maize plants. Soil supplemented with two concentrations of cadmium was used for the investigation. Cadmium content, fresh and dry mass, shoot length, leaf length and width, chlorophyll, proline, sugar and protein content, and antioxidant potential in 4-week-old plants were analysed. Cadmium content in soil and maize shoots was determined by flame atomic absorption spectrometry. Accumulation of Cd was observed for all plants, and highest Cd concentration was recorded in seedlings grown from proline-primed seeds with no visual signs of Cd toxicity...
September 27, 2018: Environmental Science and Pollution Research International
https://www.readbyqxmd.com/read/30257650/comparative-analysis-of-cd-responsive-maize-and-rice-transcriptomes-highlights-cd-co-modulated-orthologs
#20
Dan Cheng, Mingpu Tan, Haijuan Yu, Liang Li, Dandan Zhu, Yahua Chen, Mingyi Jiang
BACKGROUND: Metal tolerance is often an integrative result of metal uptake and distribution, which are fine-tuned by a network of signaling cascades and metal transporters. Thus, with the goal of advancing the molecular understanding of such metal homeostatic mechanisms, comparative RNAseq-based transcriptome analysis was conducted to dissect differentially expressed genes (DEGs) in maize roots exposed to cadmium (Cd) stress. RESULTS: To unveil conserved Cd-responsive genes in cereal plants, the obtained 5166 maize DEGs were compared with 2567 Cd-regulated orthologs in rice roots, and this comparison generated 880 universal Cd-responsive orthologs groups composed of 1074 maize DEGs and 981 rice counterparts...
September 26, 2018: BMC Genomics
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