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heavy metal stress on plant

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https://www.readbyqxmd.com/read/28819820/genome-wide-characterization-of-the-wrky-gene-family-in-radish-raphanus-sativus-l-reveals-its-critical-functions-under-different-abiotic-stresses
#1
Bernard Kinuthia Karanja, Lianxue Fan, Liang Xu, Yan Wang, Xianwen Zhu, Mingjia Tang, Ronghua Wang, Fei Zhang, Everlyne M'mbone Muleke, Liwang Liu
The radish WRKY gene family was genome-widely identified and played critical roles in response to multiple abiotic stresses. The WRKY is among the largest transcription factors (TFs) associated with multiple biological activities for plant survival, including control response mechanisms against abiotic stresses such as heat, salinity, and heavy metals. Radish is an important root vegetable crop and therefore characterization and expression pattern investigation of WRKY transcription factors in radish is imperative...
August 17, 2017: Plant Cell Reports
https://www.readbyqxmd.com/read/28790991/bacteria-associated-to-plants-naturally-selected-in-a-historical-pcb-polluted-soil-show-potential-to-sustain-natural-attenuation
#2
Lorenzo Vergani, Francesca Mapelli, Ramona Marasco, Elena Crotti, Marco Fusi, Antonio Di Guardo, Stefano Armiraglio, Daniele Daffonchio, Sara Borin
The exploitation of the association between plants and microorganisms is a promising approach able to boost natural attenuation processes for soil clean-up in vast polluted areas characterized by mixed chemical contamination. We aimed to explore the selection of root-associated bacterial communities driven by different plant species spontaneously established in abandoned agricultural soils within a historical polluted site in north Italy. The site is highly contaminated by chlorinated persistent organic pollutants, mainly constituted by polychlorobiphenyls (PCBs), together with heavy metals and metalloids, in variable concentrations and uneven distribution...
2017: Frontiers in Microbiology
https://www.readbyqxmd.com/read/28760553/genome-wide-identification-of-sweet-orange-citrus-sinensis-metal-tolerance-proteins-and-analysis-of-their-expression-patterns-under-zinc-manganese-copper-and-cadmium-toxicity
#3
Xing-Zheng Fu, Ya-Hua Tong, Xue Zhou, Li-Li Ling, Chang-Pin Chun, Li Cao, Ming Zeng, Liang-Zhi Peng
Plant metal tolerance proteins (MTPs) play important roles in heavy metal homeostasis; however, related information in citrus plants is limited. Citrus genome sequencing and assembly have enabled us to perform a systematic analysis of the MTP gene family. We identified 12 MTP genes in sweet orange, which we have named as CitMTP1 and CitMTP3 to CitMTP12 based on their sequence similarity to Arabidopsis thaliana MTPs. The CitMTPs were predicted to encode proteins of 864 to 2556 amino acids in length that included 4 to 6 putative transmembrane domains (TMDs)...
July 28, 2017: Gene
https://www.readbyqxmd.com/read/28754626/in-sights-into-the-effect-of-heavy-metal-stress-on-the-endogenous-mustard-cystatin
#4
Shumaila Khan, Nafees A Khan, Bilqees Bano
Phytocystatins have been ascribed several protective roles against abiotic and biotic stress conditions. It was, therefore, thought worthwhile to document the effect of heavy metal stress on the endogenous plant cystatin. The mustard cystatin, purified from Brassica juncea (B.juncea) seeds retained its functional property of cysteine proteinase inhibition, despite exposure to high concentrations of metal ions, Cd(2+) and Ni(2+). An increase in inhibitory activity, ∼26% for Ni(2+) and ∼16% for Cd(2+) was observed, suggesting changes in protein conformation upon metal ion interaction...
July 25, 2017: International Journal of Biological Macromolecules
https://www.readbyqxmd.com/read/28747006/biotoxic-impact-of-heavy-metals-on-growth-oxidative-stress-and-morphological-changes-in-root-structure-of-wheat-triticum-aestivum-l-and-stress-alleviation-by-pseudomonas-aeruginosa-strain-cpsb1
#5
Asfa Rizvi, Mohd Saghir Khan
Rapid industrialization and uncontrolled metal discharge into environment is a global concern for crop production. Metal tolerant bacterium isolated from chilli rhizosphere was identified as Pseudomonas aeruginosa by 16S rDNA sequence analysis. Pseudomonas aeruginosa tolerated high concentrations of Cu (1400 μg ml(-1)), Cd (1000 μg ml(-1)) and Cr (1000 μg ml(-1)). Pseudomonas aeruginosa CPSB1 produced multiple plant growth promoting biomolecules in the presence and absence of metals. Strain CPSB1 solubilized P at 400 μg ml(-1) of Cd, Cr and Cu...
October 2017: Chemosphere
https://www.readbyqxmd.com/read/28730330/effect-of-the-phosphogypsum-amendment-of-saline-and-agricultural-soils-on-growth-productivity-and-antioxidant-enzyme-activities-of-tomato-solanum-lycopersicum-l
#6
Mariem Smaoui-Jardak, Walid Kriaa, Mohamed Maalej, Mohamed Zouari, Lotfi Kamoun, Wassim Trabelsi, Ferjani Ben Abdallah, Nada Elloumi
The objective of this study was to investigate the effects of phosphogypsum (PG) amendment on the physiochemical proprieties of saline and agricultural soils along with the growth, productivity and antioxidant enzyme activities of tomato plants ( Solanum lycopersicum L.) grown on the amended soils under controlled conditions. Obtained results showed that the amendment of saline soil (H) by PG induced a decrease in pH as well as in electrical conductivity. However, for the non saline soil (MC), there was a decrease in pH associated with an increase in electrical conductivity...
July 20, 2017: Ecotoxicology
https://www.readbyqxmd.com/read/28715750/polyamines-may-influence-phytochelatin-synthesis-during-cd-stress-in-rice
#7
Magda Pál, Gabriella Csávás, Gabriella Szalai, Tímea Oláh, Radwan Khalil, Rusina Yordanova, Gyöngyvér Gell, Zsófia Birinyi, Edit Németh, Tibor Janda
Although the metabolism of phytochelatins and higher polyamines are linked with each other, the direct relationship between them under heavy metal stress has not yet been clarified. Two approaches were used to reveal the influence of polyamine content on cadmium stress responses, particularly with regard to phytochelatin synthesis: putrescine pre-treatment of rice plants followed by cadmium stress, and treatment with the putrescine synthesis inhibitor, 2-(difluoromethyl)ornithine combined with cadmium treatment...
July 8, 2017: Journal of Hazardous Materials
https://www.readbyqxmd.com/read/28712470/field-proteomics-of-populus-alba-grown-in-a-heavily-modified-environment-an-example-of-a-tannery-waste-landfill
#8
Agnieszka Szuba, Gabriela Lorenc-Plucińska
Tannery waste is highly toxic and dangerous to living organisms because of the high heavy metal content, especially chromium [Cr(III)]. This study analysed the proteomic response of the Populus alba L. clone 'Villafranca' grown for 4years on a tannery waste landfill. In this extremely hostile environment, the plants struggled with continuous stress, which inhibited growth by 54%, with a 67% decrease in tree height and diameter at breast height compared to those of the forest reference plot, respectively. The leaves and roots of the tannery landfill-grown plants produced strong proteomic stress signals for protection against reactive oxygen species (ROS) and repair to ROS-damaged proteins and DNA as well as signals for protection of the photosynthetic apparatus...
July 13, 2017: Science of the Total Environment
https://www.readbyqxmd.com/read/28702790/heavy-metal-induced-oxidative-stress-on-seed-germination-and-seedling-development-a-critical-review
#9
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
https://www.readbyqxmd.com/read/28702035/the-soybean-basic-helix-loop-helix-transcription-factor-org3-like-enhances-cadmium-tolerance-via-increased-iron-and-reduced-cadmium-uptake-and-transport-from-roots-to-shoots
#10
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
https://www.readbyqxmd.com/read/28686889/serpentine-endophytic-bacterium-pseudomonas-azotoformans-ass1-accelerates-phytoremediation-of-soil-metals-under-drought-stress
#11
Ying Ma, Mani Rajkumar, António Moreno, Chang Zhang, Helena Freitas
This study evaluates the potential of serpentine endophytic bacterium to foster phytoremediation efficiency of Trifolium arvense grown on multi-metal (Cu, Zn and Ni) contaminated soils under drought stress. A drought resistant endophytic bacterial strain ASS1 isolated from the leaves of Alyssum serpyllifolium grown in serpentine soils was identified as Pseudomonas azotoformans based on biochemical tests and partial 16S rRNA gene sequencing. P. azotoformans ASS1 possessed abiotic stress resistance (heavy metals, drought, salinity, antibiotics and extreme temperature) and plant growth promoting (PGP) properties (phosphate solubilization, nitrogen fixation, production of 1-aminocyclopropane-1-carboxylate deaminase, siderophore and ammonia)...
October 2017: Chemosphere
https://www.readbyqxmd.com/read/28670772/the-ca-2-cam2-binding-transcription-factor-tga3-elevates-lcd-expression-and-h2-s-production-to-bolster-cr-6-tolerance-in-arabidopsis
#12
Huihui Fang, Zhiqiang Liu, Yanping Long, Yali Liang, Zhuping Jin, Liping Zhang, Danmei Liu, Hua Li, Jixian Zhai, Yanxi Pei
Heavy metals (HMs) contamination on agricultural lands not only reduces crop yield but also causes human health concerns. As a plant gasotransmitter, hydrogen sulfide (H2 S) can trigger various defense responses and help reduce HMs accumulation in plants; however, little is known about the regulatory mechanisms of H2 S signaling. Here, we provided evidence to answer the long-standing question how H2 S production is elevated in plant defense against HMs stress. During Arabidopsis' response to chromium (Cr(6+) ) stress, the transcription of L-cysteine desulfhydrase (LCD), the key enzyme for H2 S production, was enhanced through the calcium (Ca(2+) )/calmodulin2 (CaM2)-mediated pathway...
July 3, 2017: Plant Journal: for Cell and Molecular Biology
https://www.readbyqxmd.com/read/28667860/poplar-response-to-cadmium-and-lead-soil-contamination
#13
Ivana Radojčić Redovniković, Alessandra De Marco, Chiara Proietti, Karla Hanousek, Marija Sedak, Nina Bilandžić, Tamara Jakovljević
An outdoor pot experiment was designed to study the potential of poplar (Populus nigra 'Italica') in phytoremediation of cadmium (Cd) and lead (Pb). Poplar was treated with a combination of different concentrations of Cd (w = 10, 25, 50mgkg(-1) soil) and Pb (400, 800, 1200mgkg(-1) soil) and several physiological and biochemical parameters were monitored including the accumulation and distribution of metals in different plant parts (leaf, stem, root). Simultaneously, the changes in the antioxidant system in roots and leaves were monitored to be able to follow synergistic effects of both heavy metals...
June 28, 2017: Ecotoxicology and Environmental Safety
https://www.readbyqxmd.com/read/28646310/effects-of-a-dark-septate-endophyte-dse-on-growth-cadmium-content-and-physiology-in-maize-under-cadmium-stress
#14
Yongmei He, Zhixin Yang, Mingrui Li, Ming Jiang, Fangdong Zhan, Yanqun Zu, Tao Li, Zhiwei Zhao
Dark septate endophytes (DSE) are widely distributed in plant roots grown in stressful habitats, especially in heavy metal-polluted soils. But little is known about the physiological interactions between DSE and plants under heavy metal stress. In the present study, the growth, Cd content, and physiological response of Zea mays L. to a root-colonized DSE, Exophiala pisciphila, were analyzed under Cd stress (0, 5, 10, 20, and 40 mg/kg) in a sand culture experiment. Under high Cd (10, 20, and 40 mg/kg) stress, the DSE colonization in roots increased the maize growth, kept more Cd in roots, and decreased Cd content in shoots...
June 23, 2017: Environmental Science and Pollution Research International
https://www.readbyqxmd.com/read/28643161/nonlinear-biotic-ligand-model-for-assessing-alleviation-effects-of-ca-mg-and-k-on-cd-toxicity-to-soybean-roots
#15
Bo-Ching Chen, Pin-Jie Wang, Pei-Chi Ho, Kai-Wei Juang
Developing a nonlinear biotic ligand model (BLM) that considers the geometrical constraints for binding of different cations on biotic ligands will provide more reliable details about the hypothetical mechanism governing the alleviation of cadmium (Cd) toxicity by coexistent cations. Soybean seedlings under Cd stress produced by various activities of coexistent cations such as calcium (Ca(2+)), magnesium (Mg(2+)), and potassium (K(+)) were hydroponically assayed for Cd toxicity to soybean roots. The Cd(2+) activity resulting in 50% reduction of root elongation (RE), EA 50, was used for assessing the Cd toxicity to the soybean seedling...
June 22, 2017: Ecotoxicology
https://www.readbyqxmd.com/read/28617190/experimental-and-theoretical-studies-of-cadmium-ions-absorption-by-a-new-reduced-recombinant-defensin
#16
Karim Mahnam, Samira Foruzandeh, Neda Mirakhorli, Behnaz Saffar
Heavy metal pollutants such as Cd, Hg, Pb, As and Se are considered as both a global problem and a growing threat to the humanity. Being strongly poisonous to the metal-sensitive enzymes and leading to the growth inhibition and death of organisms, these metals have a toxic impact on the plants and animals. Inducing the metal-binding cysteine-rich peptides such as metallothioneins, phytochelatins, and defensins, higher organisms like plants and animals usually react to the heavy metal stress. In this study, a recombinant defensin protein was expressed in bean and its ability in the cadmium absorption was determined...
June 15, 2017: Journal of Biomolecular Structure & Dynamics
https://www.readbyqxmd.com/read/28613326/arbuscular-mycorrhizal-fungi-enhance-the-copper-tolerance-of-tagetes-patula-through-the-sorption-and-barrier-mechanisms-of-intraradical-hyphae
#17
Xishi Zhou, Lei Fu, Yan Xia, Luqing Zheng, Chen Chen, Zhenguo Shen, Yahua Chen
Arbuscular mycorrhizal fungi (AMF) are widespread soil fungi that can form endosymbiotic structures with the root systems of most plants and can improve the tolerance of host plants to heavy metals. In the present study, we investigated the effects of AMF (Glomus coronatum) inoculation on the tolerance of Tagetes patula L. to Cu. Almost all of the non-mycorrhizal plants exposed to 100 μM Cu died after 3 d, whereas phytotoxicity was only observed in mycorrhizal plants that were exposed to Cu concentrations greater than 100 μM...
July 19, 2017: Metallomics: Integrated Biometal Science
https://www.readbyqxmd.com/read/28605408/casparian-bands-and-suberin-lamellae-in-exodermis-of-lateral-roots-an-important-trait-of-roots-system-response-to-abiotic-stress-factors
#18
Edita Tylová, Eva Pecková, Zuzana Blascheová, Aleš Soukup
Background and Aims: Root absorptive characteristics rely on the presence of apoplastic barriers. However, little is known about the establishment of these barriers within a complex root system, particularly in a major portion of them - the lateral roots. In Zea mays L., the exodermis differentiates under the influence of growth conditions. Therefore, the species presents a suitable model to elucidate the cross-talk among environmental conditions, branching pattern and the maturation of barriers within a complex root system involved in the definition of the plant-soil interface...
June 12, 2017: Annals of Botany
https://www.readbyqxmd.com/read/28595554/sulphur-containing-amino-acids-protective-role-against-free-radicals-and-heavy-metals
#19
Mirjana B Čolović, Vesna M Vasić, Dragan M Djuric, Danijela Z Krstić
Sulphur is an abundant element in biological systems, which plays an important role in processes essential for life as a constituent of proteins, vitamins and other crucial biomolecules. The major source of sulphur for humans is plants being able to use inorganic sulphur in the purpose of sulphur-containing amino acids synthesis. Sulphur-containing amino acids include methionine, cysteine, homocysteine, and taurine. Among them, methionine and cysteine are classified as proteinogenic, canonic amino acids incorporated in proteins structure...
June 8, 2017: Current Medicinal Chemistry
https://www.readbyqxmd.com/read/28593515/cu-resistant-kocuria-sp-crb15-a-potential-pgpr-isolated-from-the-dry-tailing-of-rakha-copper-mine
#20
Arti Hansda, Vipin Kumar, Anshumali
Rhizobacteria may enhance biomass production and heavy metal tolerance of plants under stress conditions. The present study was carried out for isolation of metal-resistant bacteria that can be further utilized for phytoremediation process. A potential metal-resistant strain CRB15 was isolated from rhizospheric region of Saccharum spontaneum that was found to be resistant against Cu (6.29 mM), Zn (3.25 mM), Pb (1.5 mM), Ni (1.25 mM), and Cd (0.25 mM). SEM analysis was performed for evaluation of morphological changes on bacterial isolate...
June 2017: 3 Biotech
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