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heavy metal stress on plant

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https://www.readbyqxmd.com/read/28646310/effects-of-a-dark-septate-endophyte-dse-on-growth-cadmium-content-and-physiology-in-maize-under-cadmium-stress
#1
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
#2
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
#3
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
#4
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...
June 14, 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
#5
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
#6
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
#7
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
https://www.readbyqxmd.com/read/28578238/combined-effects-of-environmental-disturbance-and-climate-warming-on-insect-herbivory-in-mountain-birch-in-subarctic-forests-results-of-26-year-monitoring
#8
M V Kozlov, V Zverev, E L Zvereva
Both pollution and climate affect insect-plant interactions, but the combined effects of these two abiotic drivers of global change on insect herbivory remain almost unexplored. From 1991 to 2016, we monitored the population densities of 25 species or species groups of insects feeding on mountain birch (Betula pubescens ssp. czerepanovii) in 29 sites and recorded leaf damage by insects in 21 sites in subarctic forests around the nickel-copper smelter at Monchegorsk, north-western Russia. The leaf-eating insects demonstrated variable, and sometimes opposite, responses to pollution-induced forest disturbance and to climate variations...
June 1, 2017: Science of the Total Environment
https://www.readbyqxmd.com/read/28573335/combined-effect-of-24-epibrassinolide-and-salicylic-acid-mitigates-lead-pb-toxicity-by-modulating-various-metabolites-in-brassica-juncea-l-seedlings
#9
Sukhmeen Kaur Kohli, Neha Handa, Anket Sharma, Vandana Gautam, Saroj Arora, Renu Bhardwaj, Mohammed Nasser Alyemeni, Leonard Wijaya, Parvaiz Ahmad
The present study demonstrated the combined effect of 24-epibrassinolide and salicylic acid against lead (Pb, 0.25, 0.50, and 0.75 mM) toxicity in Brassica juncea seedlings. Various parameters including water status, metal uptake, total water- and lipid-soluble antioxidants, metal chelator content (total thiols, protein-bound thiols, and non-protein-bound thiols), phenolic compounds (flavonoids, anthocyanins, and polyphenols), and organic acids were studied in 10-day-old seedlings. Dry matter content and the heavy metal tolerance index were reduced by 42...
June 1, 2017: Protoplasma
https://www.readbyqxmd.com/read/28565883/hydrogen-rich-water-alleviates-the-toxicities-of-different-stresses-to-mycelial-growth-in-hypsizygus-marmoreus
#10
Jinjing Zhang, Haibo Hao, Mingjie Chen, Hong Wang, Zhiyong Feng, Hui Chen
In plants, hydrogen gas (H2) enhances tolerance to several abiotic stresses, including salinity and heavy metals. However, the effect of H2 on fungal growth under different stresses remains largely unclear. In this study, hydrogen-rich water (HRW) was employed to characterize physiological roles and molecular mechanisms of H2 in the alleviation of three different stresses in basidiomycete Hypsizygus marmoreus. Our results showed that HRW treatment, of which the H2 concentration was 0.8 mM, significantly reduced the toxicities of CdCl2, NaCl and H2O2, leading to significantly improved mycelial growth and biomass...
December 2017: AMB Express
https://www.readbyqxmd.com/read/28556819/extraction-of-rice-phenological-differences-under-heavy-metal-stress-using-evi-time-series-from-hj-1a-b-data
#11
Shuyuan Liu, Xiangnan Liu, Meiling Liu, Ling Wu, Chao Ding, Zhi Huang
An effective method to monitor heavy metal stress in crops is of critical importance to assure agricultural production and food security. Phenology, as a sensitive indicator of environmental change, can respond to heavy metal stress in crops and remote sensing is an effective method to detect plant phenological changes. This study focused on identifying the rice phenological differences under varied heavy metal stress using EVI (enhanced vegetation index) time-series, which was obtained from HJ-1A/B CCD images and fitted with asymmetric Gaussian model functions...
May 30, 2017: Sensors
https://www.readbyqxmd.com/read/28540554/understanding-brassinosteroid-regulated-mechanisms-to-improve-stress-tolerance-in-plants-a-critical-review
#12
Fahim Nawaz, Muhammad Naeem, Bilal Zulfiqar, Asim Akram, Muhammad Yasin Ashraf, Muhammad Raheel, Rana Nauman Shabbir, Rai Altaf Hussain, Irfan Anwar, Muhammad Aurangzaib
Brassinosteroids (BRs) are steroidal plant hormones involved in regulation of physiological and molecular processes to ameliorate various biotic and abiotic stresses. Exogenous application of BRs to improve stress tolerance in plants has recently become a high research priority. Several studies have revealed the involvement of these steroidal hormones in upregulation of stress-related defense genes and their cross talk with other metabolic pathways. This is likely to stimulate research on many unanswered questions regarding their role in enhancing the ability of plants to tolerate adverse environmental conditions...
May 24, 2017: Environmental Science and Pollution Research International
https://www.readbyqxmd.com/read/28532161/modelling-of-phytoextraction-efficiency-of-microbially-stimulated-salix-dasyclados-l-in-the-soils-with-different-speciation-of-heavy-metals
#13
Michał Złoch, Tomasz Kowalkowski, Jarosław Tyburski, Katarzyna Hrynkiewicz
Bioaugmentation of soils with selected microorganisms during phytoextraction can be the key solution, but the actual efficacy of this technology should be confirmed for different physicochemical soil parameters and heavy metal availability to guarantee the universality of this method. Equally important is development of the accurate prediction tool to manage phytoremediation process.The main objective of this study was to evaluate the role of three metalotolerant siderophore-producing Streptomyces sp. B1-B3 strains in the phytoremediation of heavy metals with the use of S...
May 22, 2017: International Journal of Phytoremediation
https://www.readbyqxmd.com/read/28507557/exogenous-glutathione-enhances-mercury-tolerance-by-inhibiting-mercury-entry-into-plant-cells
#14
Yeon-Ok Kim, Hyeun-Jong Bae, Eunjin Cho, Hunseung Kang
Despite the increasing understanding of the crucial roles of glutathione (GSH) in cellular defense against heavy metal stress as well as oxidative stress, little is known about the functional role of exogenous GSH in mercury (Hg) tolerance in plants. Here, we provide compelling evidence that GSH contributes to Hg tolerance in diverse plants. Exogenous GSH did not mitigate the toxicity of cadmium (Cd), copper (Cu), or zinc (Zn), whereas application of exogenous GSH significantly promoted Hg tolerance during seed germination and seedling growth of Arabidopsis thaliana, tobacco, and pepper...
2017: Frontiers in Plant Science
https://www.readbyqxmd.com/read/28456602/an-update-on-nitric-oxide-and-its-benign-role-in-plant-responses-under-metal-stress
#15
REVIEW
Seema Sahay, Meetu Gupta
Pollution due to heavy metal(loid)s has become common menace across the globe. This is due to unprecedented frequent geological changes coupled with increasing anthropogenic activities, and population growth rate. Heavy metals (HMs) presence in the soil causes toxicity, and hampers plant growth and development. Plants being sessile are exposed to a variety of stress and/or a network of different kinds of stresses throughout their life cycle. To sense and transduce these stress signal, the signal reactive nitrogen species (RNS) particularly nitric oxide (NO) is an important secondary messenger next to only reactive oxygen species (ROS)...
April 26, 2017: Nitric Oxide: Biology and Chemistry
https://www.readbyqxmd.com/read/28432881/improvement-in-cadmium-tolerance-of-edible-rape-brassica-rapa-l-with-exogenous-application-of-chitooligosaccharide
#16
Haiying Zong, Kecheng Li, Song Liu, Lin Song, Ronge Xing, Xiaolin Chen, Pengcheng Li
Cadmium (Cd) is one of the most toxic heavy metals, which is readily taken up by plant roots and has deleterious effects on crop yield and quality. The study investigated the potential cross-protection roles of chitooligosaccharide (COS) in alleviating Cd toxicity in edible rape (Brassica rapa L.) under greenhouse conditions. The results demonstrated that spraying COS onto the leaves of edible rape could promote the plant growth and leaf chlorophyll contents, decrease the malondialdehyde (MDA) level in leaves as well as the Cd(2+) concentration in shoots and roots of edible rape under Cd stress...
April 7, 2017: Chemosphere
https://www.readbyqxmd.com/read/28397121/effect-of-biochar-on-alleviation-of-cadmium-toxicity-in-wheat-triticum-aestivum-l-grown-on-cd-contaminated-saline-soil
#17
Tahir Abbas, Muhammad Rizwan, Shafaqat Ali, Muhammad Adrees, Muhammad Zia-Ur-Rehman, Muhammad Farooq Qayyum, Yong Sik Ok, Ghulam Murtaza
Soil degradation by salinity and accumulation of trace elements such as cadmium (Cd) in the soils are expected to become one of the most critical issues hindering sustainable production and feeding the increasing population. Biochar (BC) has been known to protect the plants against soil salinity and heavy metal stress. A soil culture study was performed to evaluate the effect of BC on wheat (Triticum aestivum L.) growth, biomass, and reducing Cd and sodium (Na) uptake grown in Cd-contaminated saline soil under ambient conditions...
April 10, 2017: Environmental Science and Pollution Research International
https://www.readbyqxmd.com/read/28386269/silicon-and-plants-current-knowledge-and-technological-perspectives
#18
Marie Luyckx, Jean-Francois Hausman, Stanley Lutts, Gea Guerriero
Elemental silicon (Si), after oxygen, is the second most abundant element in the earth's crust, which is mainly composed of silicates. Si is not considered essential for plant growth and development, however, increasing evidence in the literature shows that this metalloid is beneficial to plants, especially under stress conditions. Indeed Si alleviates the toxic effects caused by abiotic stresses, e.g., salt stress, drought, heavy metals, to name a few. Biogenic silica is also a deterrent against herbivores...
2017: Frontiers in Plant Science
https://www.readbyqxmd.com/read/28377746/genome-guided-insights-into-the-plant-growth-promotion-capabilities-of-the-physiologically-versatile-bacillus-aryabhattai-strain-ab211
#19
Chandrima Bhattacharyya, Utpal Bakshi, Ivy Mallick, Shayantan Mukherji, Biswajit Bera, Abhrajyoti Ghosh
Bacillus aryabhattai AB211 is a plant growth promoting, Gram-positive firmicute, isolated from the rhizosphere of tea (Camellia sinensis), one of the oldest perennial crops and a major non-alcoholic beverage widely consumed all over the world. The whole genome of B. aryabhattai AB211 was sequenced, annotated and evaluated with special focus on genomic elements related to plant microbe interaction. It's genome sequence reveals the presence of a 5,403,026 bp chromosome. A total of 5226 putative protein-coding sequences, 16 rRNA, 120 tRNA, 8 ncRNAs, 58 non-protein coding genes, and 11 prophage regions were identified...
2017: Frontiers in Microbiology
https://www.readbyqxmd.com/read/28364646/the-influences-of-cr-tolerant-rhizobacteria-in-phytoremediation-and-attenuation-of-cr-vi-stress-in-agronomic-sunflower-helianthus-annuus-l
#20
Ali Bahadur, Rizwan Ahmad, Aftab Afzal, Huyuan Feng, Vishandas Suthar, Asfa Batool, Aman Khan, Muhammad Mahmood-Ul-Hassan
Chromium contamination of agronomic soil has to turn into a serious global problem. This research was pointed to assess the effects of three Cr-tolerant rhizobacteria (SS1, SS3, and SS6) on sunflower growth and heavy metal uptake under Cr smog i.e. 20, 30 and 40 ppm using K2Cr2O7. Root promotion assay and pot experiment were conducted to investigate and evaluate the effects of Cr tolerance rhizobacteria and Cr accumulation capacity of sunflower. From root promotion assay non-significant variation was observed in the root length between SS1 and SS3 compared with un-inoculated whereas SS6 enhanced the root length in the absence and presence of chromium...
July 2017: Chemosphere
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