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heavy metal stress on plant

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https://www.readbyqxmd.com/read/28933563/effects-of-exogenously-applied-salicylic-acid-and-putrescine-alone-and-in-combination-with-rhizobacteria-on-the-phytoremediation-of-heavy-metals-and-chickpea-growth-in-sandy-soil
#1
Naeem Khan, Asghari Bano
The present attempt was made to study the role of exogenously applied salicylic acid (SA) and putrescine (Put) on the phytoremediation of heavy metal and on the growth parameters of chickpea grown in sandy soil. The SA and Put were applied alone as well as in combination with plant growth promoting rhizobacteria (PGPR). The PGPRs, isolated from the rhizosphere of chickpea were characterized on the basis of colony morphology and biochemical traits through gram staining, catalase and oxidase tests, and identified by 16S-rRNA gene sequencing as Bacillus subtilis, Bacillus thuringiensis and Bacillus megaterium...
September 21, 2017: International Journal of Phytoremediation
https://www.readbyqxmd.com/read/28932218/alleviation-of-heavy-metal-stress-in-plants-and-remediation-of-soil-by-rhizosphere-microorganisms
#2
REVIEW
Jitendra Mishra, Rachna Singh, Naveen K Arora
Increasing concentration of heavy metals (HM) due to various anthropogenic activities is a serious problem. Plants are very much affected by HM pollution particularly in contaminated soils. Survival of plants becomes tough and its overall health under HM stress is impaired. Remediation of HM in contaminated soil is done by physical and chemical processes which are costly, time-consuming, and non-sustainable. Metal-microbe interaction is an emerging but under-utilized technology that can be exploited to reduce HM stress in plants...
2017: Frontiers in Microbiology
https://www.readbyqxmd.com/read/28932199/bacillus-a-biological-tool-for-crop-improvement-through-bio-molecular-changes-in-adverse-environments
#3
REVIEW
Ramalingam Radhakrishnan, Abeer Hashem, Elsayed F Abd Allah
Crop productivity is affected by environmental and genetic factors. Microbes that are beneficial to plants are used to enhance the crop yield and are alternatives to chemical fertilizers and pesticides. Pseudomonas and Bacillus species are the predominant plant growth-promoting bacteria. The spore-forming ability of Bacillus is distinguished from that of Pseudomonas. Members of this genus also survive for a long time under unfavorable environmental conditions. Bacillus spp. secrete several metabolites that trigger plant growth and prevent pathogen infection...
2017: Frontiers in Physiology
https://www.readbyqxmd.com/read/28924722/evaluation-of-heme-oxygenase-1-ho-1-in-cd-and-ni-induced-cytotoxicity-and-crosstalk-with-ros-quenching-enzymes-in-two-to-four-leaf-stage-seedlings-of-vigna-radiata
#4
Lovely Mahawar, Rajesh Kumar, Gyan Singh Shekhawat
Research on heme oxygenase in plants has received consideration in recent years due to its several roles in development, defense, and metabolism during various environmental stresses. In the current investigation, the role of heme oxygenase (HO) 1 was evaluated in reducing heavy metal (Cd and Ni) uptake and alleviating Cd and Ni toxicity effects in the hydroponically grown seedlings of Vigna radiata var. PDM 54. Seedlings were subjected to Cd- and Ni-induced oxidative stress independently at different concentrations ranging from 10 to 100 μM...
September 18, 2017: Protoplasma
https://www.readbyqxmd.com/read/28922758/the-role-of-arabidopsis-aldehyde-dehydrogenase-genes-in-response-to-high-temperature-and-stress-combinations
#5
Junyi Zhao, Tagnon D Missihoun, Dorothea Bartels
Aldehyde dehydrogenases (ALDH) are a family of enzymes that are involved in plant metabolism and contribute to aldehyde homeostasis to eliminate toxic aldehydes. The ALDH enzymes produce NADPH and NADH in their enzymatic reactions and thus contribute to balancing redox equivalents. Previous studies showed that Arabidopsis ALDH genes are expressed in response to high salinity, dehydration, oxidative stress, or heavy metals, suggesting important roles in environmental adaptation. However, the role of ALDH genes in high temperature and stress combinations (heat stress combined with dehydration, wounding, or salt stress) is unclear...
July 10, 2017: Journal of Experimental Botany
https://www.readbyqxmd.com/read/28895046/characterization-of-cadmium-resistant-klebsiella-pneumoniae-mcc-3091-promoted-rice-seedling-growth-by-alleviating-phytotoxicity-of-cadmium
#6
Krishnendu Pramanik, Soumik Mitra, Anumita Sarkar, Tithi Soren, Tushar Kanti Maiti
Cadmium (Cd) phytotoxicity in agricultural land is a major global concern now-a-days resulting in very poor yield. Plant growth-promoting rhizobacteria (PGPR)-mediated bioremediation is one of the convenient strategies for detoxification of Cd from the soil and for plant growth promotion under Cd stress. The selected strain K5 was identified as Klebsiella pneumoniae based on MALDI-TOF MS ribosomal protein and 16S rDNA sequence-based homology. The strain possessed several PGP traits viz. IAA production (3413 μg/mL), phosphate solubilization (80...
September 11, 2017: Environmental Science and Pollution Research International
https://www.readbyqxmd.com/read/28894921/structural-and-functional-variability-in-root-associated-bacterial-microbiomes-of-cd-zn-hyperaccumulator-sedum-alfredii
#7
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
https://www.readbyqxmd.com/read/28891950/impact-of-silicon-in-plant-biomass-production-focus-on-bast-fibres-hypotheses-and-perspectives
#8
REVIEW
Marie Luyckx, Jean-Francois Hausman, Stanley Lutts, Gea Guerriero
Silicon (Si) is an abundant element which, when supplied to plants, confers increased vigor and resistance to exogenous stresses, as well as enhanced stem mechanical strength. Plant species vary in their ability to take Si up and to accumulate it under the form of silicon dioxide (SiO₂) in their tissues: emblematic of this is the example of Poales, among which there is rice, a high Si accumulator. Monocots usually accumulate more Si than dicots; however, the impact that Si has on dicots, notably on economically important dicots, is a subject requiring further study and scientific efforts...
September 9, 2017: Plants (Basel, Switzerland)
https://www.readbyqxmd.com/read/28881317/modulation-of-antioxidative-defense-expression-and-osmolyte-content-by-co-application-of-24-epibrassinolide-and-salicylic-acid-in-pb-exposed-indian-mustard-plants
#9
Sukhmeen Kaur Kohli, Neha Handa, Shagun Bali, Saroj Arora, Anket Sharma, Ravdeep Kaur, Renu Bhardwaj
The study focuses on potential of combined pre-soaking treatment of 24-Epibrassinolide (EBL) and Salicylic acid (SA) in alleviating Pb phytotoxicity in Brassica juncea L. plants. The seeds after treatment with combination of both the hormones were sown in mixture of soil, sand and manure (3:1:1) and were exposed to Pb concentrations (0.25mM, 0.50mM and 0.75mM). After 30 days of growth, the plants were harvested and processed, for quantification of various metabolites. It was found that pre-sowing of seeds in combination of EBL and SA, mitigated the adverse effects of metal stress by modulating antioxidative defense response and enhanced osmolyte contents...
September 4, 2017: Ecotoxicology and Environmental Safety
https://www.readbyqxmd.com/read/28875293/nickel-accumulation-and-its-effect-on-growth-physiological-and-biochemical-parameters-in-millets-and-oats
#10
Vibha Gupta, Pradeep Kumar Jatav, Raini Verma, Shanker Lal Kothari, Sumita Kachhwaha
With the boom in industrialization, there is an increase in the level of heavy metals in the soil which drastically affect the growth and development of plants. Nickel is an essential micronutrient for plant growth and development, but elevated level of Ni causes stunted growth, chlorosis, nutrient imbalance, and alterations in the defense mechanism of plants in terms of accumulation of osmolytes or change in enzyme activities like guiacol peroxidase (POD), catalase (CAT), and superoxide dismutase (SOD). Ni-induced toxic response was studied in seedlings of finger millet, pearl millet, and oats in terms of seedling growth, lipid peroxidation, total chlorophyll, proline content, and enzymatic activities...
September 5, 2017: Environmental Science and Pollution Research International
https://www.readbyqxmd.com/read/28873463/effects-of-antimony-on-redox-activities-and-antioxidant-defence-systems-in-sunflower-helianthus-annuus-l-plants
#11
Alfonso Ortega, Inmaculada Garrido, Ilda Casimiro, Francisco Espinosa
The alterations induced by the toxicity of antimony (Sb) in the roots and leaves of sunflower plants were determined. The plants were grown hydroponically with different concentrations of Sb, a heavy metal which reduces biomass production and growth. There was preferential accumulation of Sb in the tissues of the roots, with the concentrations in the leaves being much lower. The accumulation of other mineral elements was also altered, especially that of Fe and Zn. Chlorophyll content declined, as also did the photosynthetic efficiency, but the carotenoid content remained unaltered...
2017: PloS One
https://www.readbyqxmd.com/read/28870293/characterization-of-multifarious-plant-growth-promoting-traits-of-rhizobacterial-strain-ar6-under-chromium-vi-stress
#12
Chinnannan Karthik, Namasivayam Elangovan, Thamilarasan Senthil Kumar, Subramani Govindharaju, Selvaraj Barathi, Mohammad Oves, Padikasan Indra Arulselvi
Plant growth promoting rhizobacteria (PGPR) can increase the host plant tolerance to cope up with heavy metal induced stress, which can be improve plant growth. Thus, the present study was designed to isolate Cr(VI) tolerant PGPR strain and evaluate its plant growth promoting (PGP) properties under Cr(VI) stress. Rhizobacterial strain AR6 was isolated from the rhizosphere of Phaseolus vulgaris L. and showed 99% homology with Cellulosimicrobium funkei (KM032184) in BLASTn analysis. Strain AR6 was specifically selected due to its high Cr(VI) tolerance (1200μg/ml) and substantial production of PGP substances...
November 2017: Microbiological Research
https://www.readbyqxmd.com/read/28866741/remediation-mechanisms-of-mercapto-grafted-palygorskite-for-cadmium-pollutant-in-paddy-soil
#13
Xuefeng Liang, Xu Qin, Qingqing Huang, Rong Huang, Xiuling Yin, Yanming Cai, Lin Wang, Yuebing Sun, Yingming Xu
The immobilization agent was the key factor that determined the success of remediation of heavy metal polluted soil. In this study, mercapto-grafted palygorskite (MP) as a novel and efficient immobilization agent was utilized for the remediation of Cd-polluted paddy soil in pot trials, and the remediation mechanisms were investigated in the aspect of soil chemistry and plant physiology with different rice cultivars as model plants. Mercapto-grafted palygorskite at applied doses of 0.1-0.3% could reduce Cd contents of brown rice and straws of different cultivars significantly...
September 2, 2017: Environmental Science and Pollution Research International
https://www.readbyqxmd.com/read/28843189/bacterial-mediated-alleviation-of-heavy-metal-stress-and-decreased-accumulation-of-metals-in-plant-tissues-mechanisms-and-future-prospects
#14
REVIEW
Hassan Etesami
Heavy metal pollution of agricultural soils is one of main concerns causing some of the different ecological and environmental problems. Excess accumulation of these metals in soil has changed microbial community (e.g., structure, function, and diversity), deteriorated soil, decreased the growth and yield of plant, and entered into the food chain. Plants' tolerance to heavy metal stress needs to be improved in order to allow growth of crops with minimum or no accumulation of heavy metals in edible parts of plant that satisfy safe food demands for the world's rapidly increasing population...
August 23, 2017: Ecotoxicology and Environmental Safety
https://www.readbyqxmd.com/read/28841436/biomarker-responses-of-rice-plants-growing-in-a-potentially-toxic-element-polluted-region-a-case-study-in-the-le-an-region
#15
Yong Ji, Jie Zhang, Xiaoli Li, Yongwen Peng, Gaotang Cai, Guiqing Gao, Jianqiang Wu, Jiali Liu
Rice plants, planted and grown in the field, were chosen in this study to evaluate the potentially toxic element pollution by combining pollutant analysis and a molecular biomarker response evaluation together in the Le'An Region, a highly polluted area due to anthropogenic activities. Soils and crops at 18 sites classified into four areas based on hydrological, geological and pollutant survey results were collected during the whole growth cycle for chemical and biological analysis. Sediment quality values and pollution indexes were combined with statistical analyses to assess the hazard of potentially toxic elements and evaluate ecological risks...
August 22, 2017: Chemosphere
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
#16
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
#17
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
#18
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)...
September 20, 2017: Gene
https://www.readbyqxmd.com/read/28754626/in-sights-into-the-effect-of-heavy-metal-stress-on-the-endogenous-mustard-cystatin
#19
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
#20
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
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