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heavy metal stress on plant

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https://www.readbyqxmd.com/read/28231558/alleviating-effects-of-calcium-on-cobalt-toxicity-in-two-barley-genotypes-differing-in-cobalt-tolerance
#1
Jonas Lwalaba Wa Lwalaba, Gerald Zvobgo, Liangbo Fu, Xuelei Zhang, Theodore Mulembo Mwamba, Noor Muhammad, Robert Prince Mukobo Mundende, Guoping Zhang
Cobalt (Co) contamination in soils is becoming a severe issue in environment safety and crop production. Calcium (Ca)(,) as a macro-nutrient element, shows the antagonism with many divalent heavy metals and the capacity of alleviating oxidative stress in plants. In this study, the protective role of Ca in alleviating Co stress was hydroponically investigated using two barley genotypes differing in Co toxicity tolerance. Barley seedlings exposed to 100µM Co showed the significant reduction in growth and photosynthetic rate, and the dramatic increase in the contents of reactive oxygen species (ROS), malondialdehyde (MDA), reduced glutathione (GSH) and oxidized glutathione (GSSG), and the activities of anti-oxidative enzymes, with Ea52 (Co-sensitive) being much more affected than Yan66 (Co-tolerant)...
February 20, 2017: Ecotoxicology and Environmental Safety
https://www.readbyqxmd.com/read/28231504/effect-of-biochar-on-cadmium-bioavailability-and-uptake-in-wheat-triticum-aestivum-l-grown-in-a-soil-with-aged-contamination
#2
Tahir Abbas, Muhammad Rizwan, Shafaqat Ali, Muhammad Zia-Ur-Rehman, Muhammad Farooq Qayyum, Farhat Abbas, Fakhir Hannan, Jörg Rinklebe, Yong Sik Ok
Cadmium (Cd) is a well-known and widespread toxic heavy metal while the effects of biochar (BC) on Cd bioavailability and toxicity in wheat, especially in soils with aged contamination are largely unknown. In the present study, the effect of rice straw BC on Cd immobilization in soil and uptake by wheat in an agricultural contaminated-soil was investigated. Different levels of rice straw BC (0%, 1.5%, 3.0% and 5% w/w) were incorporated into the soil and incubated for two weeks. After this, wheat plants were grown in the amended soil until maturity...
February 20, 2017: Ecotoxicology and Environmental Safety
https://www.readbyqxmd.com/read/28204874/effects-of-calcium-at-toxic-concentrations-of-cadmium-in-plants
#3
REVIEW
Danlian Huang, Xiaomin Gong, Yunguo Liu, Guangming Zeng, Cui Lai, Hassan Bashir, Lu Zhou, Dafei Wang, Piao Xu, Min Cheng, Jia Wan
This review provides new insight that calcium plays important roles in plant growth, heavy metal accumulation and translocation, photosynthesis, oxidative damage and signal transduction under cadmium stress. Increasing heavy metal pollution problems have raised word-wide concerns. Cadmium (Cd), being a highly toxic metal, poses potential risks both to ecosystems and human health. Compared with conventional technologies, phytoremediation, being cost-efficient, highly stable and environment-friendly, is believed to be a promising green technology for Cd decontamination...
February 15, 2017: Planta
https://www.readbyqxmd.com/read/28155655/between-species-differences-in-gene-copy-number-are-enriched-among-functions-critical-for-adaptive-evolution-in-arabidopsis-halleri
#4
Vasantika Suryawanshi, Ina N Talke, Michael Weber, Roland Eils, Benedikt Brors, Stephan Clemens, Ute Krämer
BACKGROUND: Gene copy number divergence between species is a form of genetic polymorphism that contributes significantly to both genome size and phenotypic variation. In plants, copy number expansions of single genes were implicated in cultivar- or species-specific tolerance of high levels of soil boron, aluminium or calamine-type heavy metals, respectively. Arabidopsis halleri is a zinc- and cadmium-hyperaccumulating extremophile species capable of growing on heavy-metal contaminated, toxic soils...
December 22, 2016: BMC Genomics
https://www.readbyqxmd.com/read/28153402/assessment-of-biotransfer-and-bioaccumulation-of-cadmium-lead-and-zinc-from-fly-ash-amended-soil-in-mustard-aphid-beetle-food-chain
#5
Mudasir Irfan Dar, Iain D Green, Mohd Irfan Naikoo, Fareed Ahmad Khan, Abid Ali Ansari, Mohd Iqbal Lone
The present study investigates the extent of biotransfer and bioaccumulation of cadmium (Cd), lead (Pb) and zinc (Zn) from fly ash amended soil in mustard (Brassica juncea)-aphid (Lipaphis erysimi)-beetle (Coccinella septempunctata) food chain and its subsequent implications for the beetle. The soil was amended with fly ash at the rates of 0, 5, 10, 20 and 40% (w/w). Our results showed that the uptake of Cd, Pb and Zn from soil to mustard root increased with the increase in fly ash application rates, but their root to shoot translocation was relatively restricted...
January 30, 2017: Science of the Total Environment
https://www.readbyqxmd.com/read/28146098/comprehensive-analysis-of-rice-laccase-gene-oslac-family-and-ectopic-expression-of-oslac10-enhances-tolerance-to-copper-stress-in-arabidopsis
#6
Qingquan Liu, Le Luo, Xiaoxiao Wang, Zhenguo Shen, Luqing Zheng
Laccases are encoded by a multigene family and widely distributed in plant genomes where they play roles oxidizing monolignols to produce higher-order lignin involved in plant development and stress responses. We identified 30 laccase genes (OsLACs) from rice, which can be divided into five subfamilies, mostly expressed during early development of the endosperm, growing roots, and stems. OsLACs can be induced by hormones, salt, drought, and heavy metals stresses. The expression level of OsLAC10 increased 1200-fold after treatment with 20 μM Cu for 12 h...
January 30, 2017: International Journal of Molecular Sciences
https://www.readbyqxmd.com/read/28138761/synergistic-effects-between-si-hemicellulose-matrix-ligands-and-zn-ions-in-inhibiting-cd-ion-uptake-in-rice-oryza-sativa-cells
#7
Jie Ma, Xiuqing Zhang, Lijun Wang
Our study demonstrated that Zn alleviated Cd toxicity in the presence of Si in the cell walls by Zn (2+) binding to ligands through the formation of the [Si-hemicellulose matrix]Zn complexes that restrict the uptake of Cd. The plant cell wall exhibits preferential sites for the accumulation of metals at toxic concentrations. Through modification of wall polysaccharide components, elements, such as silicon (Si) and zinc (Zn), may play active roles in alleviating the toxicity of heavy metals, including cadmium (Cd)...
January 30, 2017: Planta
https://www.readbyqxmd.com/read/28134574/ameliorates-of-salt-stress-on-bermudagrass-by-the-fungus-aspergillus-aculeatus
#8
Yan Xie, Shijuan Han, Xiaoning Li, Erick Amombo, Jinmin Fu
There is considerable evidence that plants' abiotic-stress tolerance can be evoked by the exploitation of globally abundant microbe. A.aculeatus, which was initially isolated from the rhizosphere of bermudagrass, has been shown to increase heavy metal tolerance in turfgrasses. Here, we report on the potential of A.aculeatus to induce tolerance to salt stress in bermudagrass. Physiological markers for salt stress, such as plant growth rate, lipid peroxidation, photosynthesis and ionic homeostasis were assessed...
January 30, 2017: Molecular Plant-microbe Interactions: MPMI
https://www.readbyqxmd.com/read/28092617/supplementation-of-pigs-diet-with-zinc-and-copper-as-alternative-to-conventional-antimicrobials
#9
B Dębski
Modern commercial pig farming systems inflict increased stress in animals, which often leads to various negative changes in the gastro-intestinal tract, especially in the case of piglets. Ban of antibiotics, used as growth promoters, has caused a need for alternatives to conventional antimicrobials in swine diets. Use of pre-/or probiotics, organic acids and plant extracts is often recommended, but it seems that zinc oxide and cooper salts, which were traditionally included in high doses to piglets diet, possess the highest efficacy...
December 1, 2016: Polish Journal of Veterinary Sciences
https://www.readbyqxmd.com/read/28010046/development-of-transgenic-crops-based-on-photo-biotechnology
#10
REVIEW
Markkandan Ganesan, Hyo-Yeon Lee, Jeong-Il Kim, Pill-Soon Song
The phenotypes associated with plant photomorphogenesis such as the suppressed shade avoidance response and de-etiolation offer the potential for significant enhancement of crop yields. Of many light signal transducers and transcription factors involved in the photomorphogenic responses of plants, this review focuses on the transgenic overexpression of the photoreceptor genes at the uppermost stream of the signaling events, particularly phytochromes, crytochromes and phototropins as the transgenes for the genetic engineering of crops with improved harvest yields...
December 23, 2016: Plant, Cell & Environment
https://www.readbyqxmd.com/read/28005214/aluminium-toxicity-to-plants-as-influenced-by-the-properties-of-the-root-growth-environment-affected-by-other-co-stressors-a-review
#11
REVIEW
Joanna Siecińska, Artur Nosalewicz
Aluminium toxicity to crops depends on the acidity of the soil and specific plant resistance. However, it is also strongly affected by other environmental factors that have to be considered to properly evaluate the resultant effects on plants. Observed weather perturbations and predicted climate changes will increase the probability of co-occurrence of aluminium toxicity and other abiotic stresses.In this review the mechanisms of plant-aluminium interactions are shown to be influenced by soil mineral nutrients, heavy metals, organic matter, oxidative stress and drought...
December 23, 2016: Reviews of Environmental Contamination and Toxicology
https://www.readbyqxmd.com/read/27988808/inheritance-and-quantitative-trail-loci-mapping-of-adventitious-root-numbers-in-cucumber-seedlings-under-waterlogging-conditions
#12
Xuewen Xu, Jing Ji, Qiang Xu, Xiaohua Qi, Xuehao Chen
The hypocotyl-derived adventitious root (AR) is an important morphological acclimation to waterlogging stress; however, its genetic basis has not been adequately understood. In the present study, a mixed major gene plus polygene inheritance model was used to analyze AR numbers (ARN) 7 days after waterlogging treatment in six generations (P1, P2, F1, B1, B2, and F2), using cucumber waterlogging tolerant line Zaoer-N and sensitive Pepino as parents. The results showed that the genetic model D-4, mixed one negative dominance major gene and additive-dominance polygenes, is the best-fitting genetic model for waterlogging-triggered ARN phenotype...
December 17, 2016: Molecular Genetics and Genomics: MGG
https://www.readbyqxmd.com/read/27965704/magnesium-alleviates-adverse-effects-of-lead-on-growth-photosynthesis-and-ultrastructural-alterations-of-torreya-grandis-seedlings
#13
Jie Shen, Lili Song, Karin Müller, Yuanyuan Hu, Yang Song, Weiwu Yu, Hailong Wang, Jiasheng Wu
Magnesium (Mg(2+)) has been shown to reduce the physiological and biochemical stress in plants caused by heavy metals. To date our understanding of how Mg(2+) ameliorates the adverse effects of heavy metals in plants is scarce. The potential effect of Mg(2+) on lead (Pb(2+)) toxicity in plants has not yet been studied. This study was designed to clarify the mechanism of Mg(2+)-induced alleviation of lead (Pb(2+)) toxicity. Torreya grandis (T. grandis) seedlings were grown in substrate contaminated with 0, 700 and 1400 mg Pb(2+) per kg(-1) and with or without the addition of 1040 mg kg(-1) Mg(2+)...
2016: Frontiers in Plant Science
https://www.readbyqxmd.com/read/27951494/the-long-term-resistance-mechanisms-critical-irrigation-threshold-and-relief-capacity-shown-by-eugenia-myrtifolia-plants-in-response-to-saline-reclaimed-water
#14
José Ramón Acosta-Motos, José Antonio Hernández, Sara Álvarez, Gregorio Barba-Espín, María Jesús Sánchez-Blanco
Salts present in irrigation water are serious problems for commercial horticulture, particularly in semi-arid regions. Reclaimed water (RW) typically contains, among others elements, high levels of salts, boron and heavy metal. Phytotoxic ion accumulation in the substrate has been linked to different electric conductivities of the treatments. Based on these premises, we studied the long-term effect of three reclaimed water treatments with different saline concentrations on Eugenia myrtifolia plants. We also looked at the ability of these plants to recover when no drainage was applied...
December 5, 2016: Plant Physiology and Biochemistry: PPB
https://www.readbyqxmd.com/read/27915147/highly-sensitive-optical-interferometric-technique-reveals-stress-dependent-instantaneous-nanometric-growth-fluctuations-of-chinese-chive-leaf-under-heavy-metal-stress
#15
Kokge Thilini Kanchana Muthumali DeSilva, Uma Maheswari Rajagopalan, Hirofumi Kadono
Plant growth apart from being a complex and highly dynamic is dependent on its immediate environment. Leaf expansion measurements using Statistical Interferometry Technique, a sensitive interferometric technique at nanometric accuracy and at sub-second levels revealed the presence of characteristic nanometric intrinsic fluctuations [Plant Biotechnology 31, 195 (2014)]. In this paper, we demonstrate that the nanometric intrinsic fluctuations are sensitive enough that they change under exposure of heavy metals, essential micronutrient zinc and non-essential element cadmium, at relatively low concentrations in the leaves of Chinese chive (Allium tuberosum)...
March 2017: Ecotoxicology and Environmental Safety
https://www.readbyqxmd.com/read/27882494/role-of-rhizophagus-irregularis-in-alleviating-cadmium-toxicity-via-improving-the-growth-micro-and-macroelements-uptake-in-phragmites-australis
#16
Li Wang, Xiaochen Huang, Fang Ma, Shih-Hsin Ho, Jieting Wu, Shishu Zhu
Arbuscular mycorrhizal (AM) fungi have been used to alleviate heavy metal stress on plant growth and uptake of micro- and macroelements. A greenhouse pot experiment was conducted to verify the effects of AM fungus Rhizophagus irregularis on the growth, physiological characteristics, total Cd, and element uptake of Phragmites australis under different Cd stress (in the range of 0-20 mg L(-1)). The results showed that the symbiosis could effectively alleviate Cd toxicity with greater root biomass, higher photosynthesis rate, and lower levels of malonaldehyde (MDA) and proline than non-mycorrhizal plants could...
November 23, 2016: Environmental Science and Pollution Research International
https://www.readbyqxmd.com/read/27876226/effect-of-the-selective-pressure-of-sub-lethal-level-of-heavy-metals-on-the-fate-and-distribution-of-args-in-the-catchment-scale
#17
Yan Xu, Jian Xu, Daqing Mao, Yi Luo
Our previous study demonstrated that high levels of antibiotic resistance genes (ARGs) in the Haihe River were directly attributed to the excessive use of antibiotics in animal agriculture. The antibiotic residues of the Xiangjiang River determined in this study were much lower than those of the Haihe River, but the relative abundance of 16 detected ARGs (sul1, sul2 and sul3, qepA, qnrA, qnrB, qnrD and qnrS, tetA, tetB, tetW, tetM, tetQ and tetO, ermB and ermC), were as high as the Haihe River particularly in the downstream of the Xiangjiang River which is close to the extensive metal mining...
January 2017: Environmental Pollution
https://www.readbyqxmd.com/read/27858338/value-added-phytoremediation-of-metal-stressed-soils-using-phosphate-solubilizing-microbial-consortium
#18
REVIEW
Pratishtha Gupta, Vipin Kumar
The presence of heavy metals in the soil is a matter of growing concern due to their toxic and non-biodegradable nature. Lack of effectiveness of various conventional methods due to economic and technical constraints resulted in the search for an eco-friendly and cost-effective biological techniques for heavy metal removal from the environment. Until now, phytoremediation has emerged as an innovative technique to address the problem. However, the efficiency of phytoremediation process is hindered under the high metal concentration conditions...
January 2017: World Journal of Microbiology & Biotechnology
https://www.readbyqxmd.com/read/27833636/hydrogen-sulfide-a-signal-molecule-in-plant-cross-adaptation
#19
REVIEW
Zhong-Guang Li, Xiong Min, Zhi-Hao Zhou
For a long time, hydrogen sulfide (H2S) has been considered as merely a toxic by product of cell metabolism, but nowadays is emerging as a novel gaseous signal molecule, which participates in seed germination, plant growth and development, as well as the acquisition of stress tolerance including cross-adaptation in plants. Cross-adaptation, widely existing in nature, is the phenomenon in which plants expose to a moderate stress can induce the resistance to other stresses. The mechanism of cross-adaptation is involved in a complex signal network consisting of many second messengers such as Ca(2+), abscisic acid, hydrogen peroxide and nitric oxide, as well as their crosstalk...
2016: Frontiers in Plant Science
https://www.readbyqxmd.com/read/27769905/improved-method-for-effective-screening-of-acc-1-aminocyclopropane-1-carboxylate-deaminase-producing-microorganisms
#20
Chandrashekhar Patil, Rahul Suryawanshi, Sunil Koli, Satish Patil
Aminocyclopropane-1-carboxylate deaminase (ACCD) producing microorganisms support plant growth under a variety of biotic and abiotic stress conditions such as drought, soil salinity, flooding, heavy metal pollution and phyto-pathogen attack. Available screening methods for ACCD give idea only about its primary microbial ACCD activity than the actual potential. In the present investigation, we have simply improved screening method by incorporating pH indicator dyes (phenol red and bromothymol blue) in ACC containing medium...
October 18, 2016: Journal of Microbiological Methods
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