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Metal plant defense

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https://www.readbyqxmd.com/read/28533793/exogenous-supplementation-of-silicon-improved-the-recovery-of-hyperhydric-shoots-in-dianthus-caryophyllus-l-by-stabilizing-the-physiology-and-protein-expression
#1
Prabhakaran Soundararajan, Abinaya Manivannan, Yoon S Cho, Byoung R Jeong
Hyperhydricity is one of the major problems hindering in vitro propagation of Dianthus caryophyllus L. Silicon (Si) is a well-known beneficial element renowned for its stress amelioration properties in plants. This study has demonstrated the physiological and molecular mechanism behind the Si-mediated recovery from hyperhydricity in D. caryophyllus L. 'Green Beauty'. Four weeks old hyperhydric shoots obtained from temporary immersion system were cultured on the Murashige and Skoog medium supplemented with 0 (control), 1...
2017: Frontiers in Plant Science
https://www.readbyqxmd.com/read/28507557/exogenous-glutathione-enhances-mercury-tolerance-by-inhibiting-mercury-entry-into-plant-cells
#2
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/28504920/silicon-s-role-in-abiotic-and-biotic-plant-stresses
#3
Daniel Debona, Fabrício A Rodrigues, Lawrence E Datnoff
Silicon (Si) plays a pivotal role in the nutritional status of a wide variety of monocot and dicot plant species and helps them, whether direct or indirectly, counteract abiotic and/or biotic stresses. In general, plants with a high root or shoot Si concentration are less prone to suffer from pest attack and exhibit enhanced tolerance to abiotic stresses such as drought, low temperature, or metal toxicity. However, the most notable effect of Si is the reduction in the intensities of a number of seedborne, soilborne, and foliar diseases in many economically important crops that are caused by biotrophic, hemibiotrophic, and necrotrophic plant pathogens...
May 15, 2017: Annual Review of Phytopathology
https://www.readbyqxmd.com/read/28494393/alterations-in-growth-oxidative-damage-and-metal-uptake-of-five-aromatic-rice-cultivars-under-lead-toxicity
#4
Umair Ashraf, Saddam Hussain, Shakeel Ahmad Anjum, Farhat Abbas, Mohsin Tanveer, Mehmood Ali Noor, Xiangru Tang
Lead (Pb) affects plant growth and its related physio-biochemical functions negatively. The present study investigated the responses of five different fragrant rice cultivars viz., Meixiangzhan (MXZ-2), Xiangyaxiangzhan (XYXZ), Guixiangzhan (GXZ), Basmati-385 (B-385), and Nongxiang-18 (NX-18) to four different Pb concentrations viz., 0, 400, 800 and 1200 μM. Results depicted that Pb toxicity significantly (P < 0.05) reduced the plant height, tillering ability and biomass accumulation by causing oxidative damage to rice plants; nonetheless, a significant variation was found in the sensitivity of rice cultivars to Pb toxicity...
April 21, 2017: Plant Physiology and Biochemistry: PPB
https://www.readbyqxmd.com/read/28456602/an-update-on-nitric-oxide-and-its-benign-role-in-plant-responses-under-metal-stress
#5
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/28445036/silver-nanoparticles-and-wheat-roots-a-complex-interplay
#6
Ana E Pradas Del Real, Vladimir Vidal, Marie Carrière, Hiram Castillo-Michel, Clément Levard, Perrine Chaurand, Géraldine Sarret
Agricultural soils are major sinks of silver nanoparticles in the environment, and crops are directly exposed to these emerging contaminants. A clear picture of their chemical transformations, uptake and transport mechanisms, and phytotoxic impacts is still lacking. In this work, wheat plants were exposed to pristine metallic (Ag-NPs) and sulfidized (Ag2S-NPs) silver nanoparticles and ionic Ag. Data on Ag distribution and speciation, phytotoxicity markers, and gene expression were studied. A multi-technique and multi-scale approach was applied, combining innovating tools at both the laboratory and synchrotron...
May 5, 2017: Environmental Science & Technology
https://www.readbyqxmd.com/read/28430017/two-nramp6-isoforms-function-as-iron-and-manganese-transporters-and-contribute-to-disease-resistance-in-rice
#7
Cristina Peris-Peris, Albert Serra-Cardona, Ferrán Sánchez-Sanuy, Sonia Campo, Joaquin Ariño, Blanca San Segundo
Metal ions are essential elements for all living organisms. However, metals can be toxic when present in excess. In plants, metal homeostasis is partly achieved through the function of metal transporters, including the diverse natural resistance-associated macrophage proteins (NRAMP). Among them, the OsNramp6 gene encodes a previously uncharacterized member of the rice NRAMP family that undergoes alternative splicing to produce different NRAMP6 proteins. In this work, we determined the metal transport activity and biological role of the full-length and the shortest NRAMP6 proteins (l-NRAMP6 and s-NRAMP6, respectively)...
May 2017: Molecular Plant-microbe Interactions: MPMI
https://www.readbyqxmd.com/read/28399194/interactions-between-plant-hormones-and-heavy-metals-responses
#8
Lauro Bücker-Neto, Ana Luiza Sobral Paiva, Ronei Dorneles Machado, Rafael Augusto Arenhart, Marcia Margis-Pinheiro
Heavy metals are natural non-biodegradable constituents of the Earth's crust that accumulate and persist indefinitely in the ecosystem as a result of human activities. Since the industrial revolution, the concentration of cadmium, arsenic, lead, mercury and zinc, amongst others, have increasingly contaminated soil and water resources, leading to significant yield losses in plants. These issues have become an important concern of scientific interest. Understanding the molecular and physiological responses of plants to heavy metal stress is critical in order to maximize their productivity...
April 10, 2017: Genetics and Molecular Biology
https://www.readbyqxmd.com/read/28390150/quantitative-proteomics-investigation-of-leaves-from-two-sedum-alfredii-crassulaceae-populations-that-differ-in-cadmium-accumulation
#9
Zhongchun Zhang, Huina Zhou, Qi Yu, Yunxia Li, David G Mendoza-Cózatl, Baosheng Qiu, Pingping Liu, Qiansi Chen
Due to extraordinary their capacity to hypertolerate and hyperaccumulate heavy metals in above-ground tissues, hyperaccumulator species have gained wide attention from researchers seeking biotechnologies to manage environmental heavy metal pollution. However, the molecular basis of hyperaccumulation is still far from being fully understood. Here, we used iTRAQ to perform a quantitative proteomics study of the leaves of Sedum alfredii (Crassulaceae) from hyperaccumulating (HP) and non-hyperaccumulating (NHP) populations...
April 8, 2017: Proteomics
https://www.readbyqxmd.com/read/28347915/chromium-speciation-bioavailability-uptake-toxicity-and-detoxification-in-soil-plant-system-a-review
#10
REVIEW
Muhammad Shahid, Saliha Shamshad, Marina Rafiq, Sana Khalid, Irshad Bibi, Nabeel Khan Niazi, Camille Dumat, Muhammad Imtiaz Rashid
Chromium (Cr) is a potentially toxic heavy metal which does not have any essential metabolic function in plants. Various past and recent studies highlight the biogeochemistry of Cr in the soil-plant system. This review traces a plausible link among Cr speciation, bioavailability, phytouptake, phytotoxicity and detoxification based on available data, especially published from 2010 to 2016. Chromium occurs in different chemical forms (primarily as chromite (Cr(III)) and chromate (Cr(VI)) in soil which vary markedly in term of their biogeochemical behavior...
July 2017: Chemosphere
https://www.readbyqxmd.com/read/28239385/hydrogen-peroxide-pretreatment-mitigates-cadmium-induced-oxidative-stress-in-brassica-napus-l-an-intrinsic-study-on-antioxidant-defense-and-glyoxalase-systems
#11
Mirza Hasanuzzaman, Kamrun Nahar, Sarvajeet S Gill, Hesham F Alharby, Bam H N Razafindrabe, Masayuki Fujita
Cadmium (Cd) is considered as one of the most toxic metals for plant growth and development. In the present study, we investigated the role of externally applied hydrogen peroxide (H2O2) in regulating the antioxidant defense and glyoxalase systems in conferring Cd-induced oxidative stress tolerance in rapeseed (Brassica napus L.). Seedlings were pretreated with 50 μM H2O2 for 24 h. These pretreated seedlings as well as non-pretreated seedlings were grown for another 48 h at two concentrations of CdCl(2) (0...
2017: Frontiers in Plant Science
https://www.readbyqxmd.com/read/28231506/plant-chromium-uptake-and-transport-physiological-effects-and-recent-advances-in-molecular-investigations
#12
REVIEW
Maria Angélica da Conceição Gomes, Rachel Ann Hauser-Davis, Marina Satika Suzuki, Angela Pierre Vitória
Increasingly, anthropogenic perturbations of the biosphere manifest in a broad array of global phenomena, causing widespread contamination of most ecosystems, with high dispersion rates of many contaminants throughout different environmental compartments, including metals. Chromium (Cr) contamination in particular, is, increasingly, posing a serious threat to the environment, emerging as a major health hazard to the biota. However, although the molecular and physiological mechanisms of plant responses to many heavy metals, especially lead (Pb) and cadmium (Cd), have been focused upon in recent years, chromium has attracted significantly less attention...
June 2017: Ecotoxicology and Environmental Safety
https://www.readbyqxmd.com/read/28187710/ionomic-and-metabolic-responses-to-neutral-salt-or-alkaline-salt-stresses-in-maize-zea-mays-l-seedlings
#13
Rui Guo, LianXuan Shi, Changrong Yan, Xiuli Zhong, FengXue Gu, Qi Liu, Xu Xia, Haoru Li
BACKGROUND: Soil salinity and alkalinity present a serious threat to global agriculture. However, most of the studies have focused on neutral salt stress, and the information on the metabolic responses of plants to alkaline salt stress is limited. This investigation aimed at determining the influence of neutral salt and alkaline salt stresses on the content of metal elements and metabolites in maize plant tissues, by using mixtures of various proportions of NaCl, NaHCO3, Na2SO4, and Na2CO3...
February 10, 2017: BMC Plant Biology
https://www.readbyqxmd.com/read/28117669/coordinated-actions-of-glyoxalase-and-antioxidant-defense-systems-in-conferring-abiotic-stress-tolerance-in-plants
#14
REVIEW
Mirza Hasanuzzaman, Kamrun Nahar, Md Shahadat Hossain, Jubayer Al Mahmud, Anisur Rahman, Masashi Inafuku, Hirosuke Oku, Masayuki Fujita
Being sessile organisms, plants are frequently exposed to various environmental stresses that cause several physiological disorders and even death. Oxidative stress is one of the common consequences of abiotic stress in plants, which is caused by excess generation of reactive oxygen species (ROS). Sometimes ROS production exceeds the capacity of antioxidant defense systems, which leads to oxidative stress. In line with ROS, plants also produce a high amount of methylglyoxal (MG), which is an α-oxoaldehyde compound, highly reactive, cytotoxic, and produced via different enzymatic and non-enzymatic reactions...
January 20, 2017: International Journal of Molecular Sciences
https://www.readbyqxmd.com/read/28030779/nitric-oxide-improves-s-assimilation-and-gsh-production-to-prevent-inhibitory-effects-of-cadmium-stress-on-photosynthesis-in-mustard-brassica-juncea-l
#15
Tasir S Per, Asim Masood, Nafees A Khan
Nitric oxide (NO) is an important gaseous signalling molecule that participates in many developmental and physiological processes, including defense responses against toxic metals in plants. The role of NO in cadmium (Cd)-induced toxic effects on photosynthesis was examined in mustard (Brassica juncea L.) plants. Exposure of plants to 50 μM Cd significantly enhanced oxidative stress (H2O2 content and lipid peroxidation) and impaired plant growth and photosynthesis, chlorophyll fluorescence and reduced chlorophyll content and stomatal conductance...
December 25, 2016: Nitric Oxide: Biology and Chemistry
https://www.readbyqxmd.com/read/28018404/functional-and-integrative-analysis-of-the-proteomic-profile-of-radish-root-under-pb-exposure
#16
Yan Wang, Liang Xu, Mingjia Tang, Haiyan Jiang, Wei Chen, Wei Zhang, Ronghua Wang, Liwang Liu
Lead (Pb) is one of the most abundant heavy metal (HM) pollutants, which can penetrate the plant through the root and then enter the food chain causing potential health risks for human beings. Radish is an important root vegetable crop worldwide. To investigate the mechanism underlying plant response to Pb stress in radish, the protein profile changes of radish roots respectively upon Pb(NO3)2 at 500 mg L(-1)(Pb500) and 1000 mg L(-1)(Pb1000), were comprehensively analyzed using iTRAQ (Isobaric Tag for Relative and Absolute Quantification)...
2016: Frontiers in Plant Science
https://www.readbyqxmd.com/read/27989938/proteomic-analysis-provides-insights-into-the-molecular-bases-of-hydrogen-gas-induced-cadmium-resistance-in-medicago-sativa
#17
Chen Dai, Weiti Cui, Jincheng Pan, Yanjie Xie, Jin Wang, Wenbiao Shen
Recently, molecular hydrogen (H2) has emerged as a bio-regulator both in animals and plants. Normally, functions of endogenous generated H2 could be mimicked by exogenously applied hydrogen-rich water (HRW) or hydrogen-rich saline (particularly in animals). Although alfalfa seedlings showed more cadmium (Cd) resistance after the administration with HRW, corresponding molecular mechanism is still elusive. To address this gap, iTRAQ-based quantitative proteomics was used. The results showed that a total of 2377 proteins were identified with <1% FDR, and 1254 protein abundance perturbations were confidently assessed...
January 30, 2017: Journal of Proteomics
https://www.readbyqxmd.com/read/27933379/the-role-of-receptor-like-protein-kinases-rlks-in-abiotic-stress-response-in-plants
#18
REVIEW
Yaoyao Ye, Yanfei Ding, Qiong Jiang, Feijuan Wang, Junwei Sun, Cheng Zhu
We review and introduce recent studies on RLK s involved in the abiotic stress response and provide insights into potential regulatory mechanisms for alleviating abiotic stress. Abiotic stresses are important factors affecting plant growth and development, resulting in crop production reduction and even plant death. To survive, plants utilize different mechanisms to respond and adapt to continuously changing environmental factors. Understanding of the molecular mechanisms of plant response to various stresses will aid in improving tolerance of plants to abiotic stress through genetic engineering, which would greatly promote the development of modern agriculture...
February 2017: Plant Cell Reports
https://www.readbyqxmd.com/read/27917181/nitric-oxide-responsive-heavy-metal-associated-gene-athmad1-contributes-to-development-and-disease-resistance-in-arabidopsis-thaliana
#19
Q Muhammad Imran, Noreen Falak, Adil Hussain, Bong-Gyu Mun, Arti Sharma, Sang-Uk Lee, Kyung-Min Kim, Byung-Wook Yun
Exposure of plants to different biotic and abiotic stress condition instigates significant change in the cellular redox status; resulting in the elevation of reactive nitrogen species that play signaling role in mediating defense responses. Heavy metal associated (HMA) domain containing genes are required for spatio-temporal transportation of metal ions that bind with various enzymes and co-factors within the cell. To uncover the underlying mechanisms mediated by AtHMA genes, we identified 14 Arabidopsis HMA genes that were differentially expressed in response to nitrosative stress through RNA-seq analysis...
2016: Frontiers in Plant Science
https://www.readbyqxmd.com/read/27882491/influence-of-phosphorous-fertilization-on-copper-phytoextraction-and-antioxidant-defenses-in-castor-bean-ricinus-communis-l
#20
Guoyong Huang, Muhammad Shahid Rizwan, Chao Ren, Guangguang Guo, Qingling Fu, Jun Zhu, Hongqing Hu
Application of fertilizers to supply appropriate nutrients has become an essential agricultural strategy for enhancing the efficiency of phytoremediation in heavy metal contaminated soils. The present study was conducted to investigate the beneficial effects of three types of phosphate fertilizers (i.e., oxalic acid-activated phosphate rock (APR), Ca(H2PO4)2, and NaH2PO4) in the range of 0-600 mg P kg(-1) soil, on castor bean growth, antioxidants [antioxidative enzymes and glutathione (GSH)], and Cu uptake...
November 23, 2016: Environmental Science and Pollution Research International
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