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Metal plant defense

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https://www.readbyqxmd.com/read/28759767/heavy-metals-in-contaminated-environment-destiny-of-secondary-metabolite-biosynthesis-oxidative-status-and-phytoextraction-in-medicinal-plants
#1
REVIEW
Behnam Asgari Lajayer, Mansour Ghorbanpour, Shahab Nikabadi
Contamination of soils, water and air with toxic heavy metals by various human activities is a crucial environmental problem in both developing and developed countries. Heavy metals could be introduced into medicinal plant products through contaminated environment (soil, water and air resources) and/or poor production practices. Growing of medicinal plants in heavy metal polluted environments may eventually affect the biosynthesis of secondary metabolites, causing significant changes in the quantity and quality of these compounds...
July 28, 2017: Ecotoxicology and Environmental Safety
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
#2
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/28726715/overexpression-of-the-osimp-gene-increases-the-accumulation-of-inositol-and-confers-enhanced-cold-tolerance-in-tobacco-through-modulation-of-the-antioxidant-enzymes-activities
#3
Rong-Xiang Zhang, Li-Jun Qin, De-Gang Zhao
Inositol is a cyclic polyol that is involved in various physiological processes, including signal transduction and stress adaptation in plants. l-myo-inositol monophosphatase (IMPase) is one of the metal-dependent phosphatase family members and catalyzes the last reaction step of biosynthesis of inositol. Although increased IMPase activity induced by abiotic stress has been reported in chickpea plants, the role and regulation of the IMP gene in rice (Oryza sativa L.) remains poorly understood. In the present work, we obtained a full-length cDNA sequence coding IMPase in the cold tolerant rice landraces in Gaogonggui, which is named as OsIMP...
July 20, 2017: Genes
https://www.readbyqxmd.com/read/28708985/ultrastructural-protein-and-photosynthetic-alterations-induced-by-pb-and-cd-in-cynara-cardunculus-l-and-its-potential-for-phytoremediation
#4
C Arena, F Figlioli, M C Sorrentino, L G Izzo, F Capozzi, S Giordano, V Spagnuolo
The effects of cadmium and lead were investigated in Cynara cardunculus L. Plant uptake by root and shoot, changes in cell ultrastructure and photosynthetic efficiency, photosynthetic key protein levels, as well as regulation of stress-induced Hsp70 were examined. Cynara cardunculus accumulated Cd and Pb in their tissue, with a different trend for the two metals. The prompt translocation of Cd to the shoot may justify the ultrastructural injuries, especially observed in chloroplasts. However, Cd- treated plants did not show any decline in photochemistry; it is likely that Cd in shoot tissue triggers defense mechanisms, increasing the level of proteins involved in photosynthesis (i...
July 11, 2017: Ecotoxicology and Environmental Safety
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
#5
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/28647606/role-of-streptomyces-pactum-in-phytoremediation-of-trace-elements-by-brassica-juncea-in-mine-polluted-soils
#6
Amjad Ali, Di Guo, Amanullah Mahar, Zhen Wang, Dost Muhammad, Ronghua Li, Ping Wang, Feng Shen, Quanhong Xue, Zengqiang Zhang
The industrial expansion, smelting, mining and agricultural practices have increased the release of toxic trace elements (TEs) in the environment and threaten living organisms. The microbe-assisted phytoremediation is environmentally safe and provide an effective approach to remediate TEs contaminated soils. A pot experiment was conducted to test the potential of an Actinomycete, subspecies Streptomyces pactum (Act12) along with medical stone compost (MSC) by growing Brassica juncea in smelter and mines polluted soils of Feng County (FC) and Tongguan (TG, China), respectively...
June 22, 2017: Ecotoxicology and Environmental Safety
https://www.readbyqxmd.com/read/28624590/maleic-acid-assisted-improvement-of-metal-chelation-and-antioxidant-metabolism-confers-chromium-tolerance-in-brassica-juncea-l
#7
Jubayer Al Mahmud, Mirza Hasanuzzaman, Kamrun Nahar, Anisur Rahman, Md Shahadat Hossain, Masayuki Fujita
Chromium (Cr) is a highly toxic environmental pollutant that negatively affects plant growth and development. Thus, remediating Cr from soil or increasing plant tolerance against Cr stress is urgent. Organic acids are recognized as agents of phytoremediation and as exogenous protectants, but using maleic acid (MA) to attain these results has not yet been studied. Therefore, our study investigated the effects of MA on Cr uptake and mitigation of Cr toxicity. We treated 8-d-old Indian mustard (Brassica juncea L...
June 15, 2017: Ecotoxicology and Environmental Safety
https://www.readbyqxmd.com/read/28623252/natural-variation-in-arabidopsis-thaliana-cd-responses-and-the-detection-of-quantitative-trait-loci-affecting-cd-tolerance
#8
Sina Fischer, Thomas Spielau, Stephan Clemens
Metal tolerance is often a result of metal storage or distribution. Thus, with the goal of advancing the molecular understanding of such metal homeostatic mechanisms, natural variation of metal tolerance in Arabidopsis thaliana was investigated. Substantial variation exists in tolerance of excess copper (Cu), zinc (Zn) and cadmium (Cd). Two accessions, Col-0 and Bur-0, and a recombinant inbred line (RIL) population derived from these parents were chosen for further analysis of Cd and Zn tolerance variation, which is evident at different plant ages in various experimental systems and appears to be genetically linked...
June 16, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28600794/citric-acid-enhanced-the-antioxidant-defense-system-and-chromium-uptake-by-lemna-minor-l-grown-in-hydroponics-under-cr-stress
#9
Rasham Sallah-Ud-Din, Mujahid Farid, Rashid Saeed, Shafaqat Ali, Muhammad Rizwan, Hafiz Muhammad Tauqeer, Syed Asad Hussain Bukhari
Phytoextraction is a cost-effective and eco-friendly technique for the removal of pollutants, mainly heavy metal(loids) especially from polluted water and metal-contaminated soils. The phytoextraction of heavy metals is, in general, limited due to the low availability of heavy metals in the growth medium. Organic chelators can help to improve the phytoextraction by increasing metal mobility and solubility in the growth medium. The present research was carried out to examine the possibility of citric acid (CA) in improving chromium (Cr) phytoextraction by Lemna minor (duckweed)...
July 2017: Environmental Science and Pollution Research International
https://www.readbyqxmd.com/read/28597415/effects-of-cuo-nanoparticles-on-lemna-minor
#10
Guanling Song, Wenhua Hou, Yuan Gao, Yan Wang, Lin Lin, Zhiwei Zhang, Qiang Niu, Rulin Ma, Lati Mu, Haixia Wang
BACKGROUND: Copper dioxide nanoparticles (NPs), which is a kind of important and widely used metal oxide NP, eventually reaches a water body through wastewater and urban runoff. Ecotoxicological studies of this kind of NPs effects on hydrophyte are very limited at present. Lemna minor was exposed to media with different concentrations of CuO NPs, bulk CuO, and two times concentration of Cu(2+) released from CuO NPs in culture media. The changes in plant growth, chlorophyll content, antioxidant defense enzyme activities [i...
December 2016: Botanical Studies (Taipei, Taiwan)
https://www.readbyqxmd.com/read/28595554/sulphur-containing-amino-acids-protective-role-against-free-radicals-and-heavy-metals
#11
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/28567675/impact-of-metal-stress-on-the-production-of-secondary-metabolites-in-pteris-vittata-l-and-associated-rhizosphere-bacterial-communities
#12
Hoang Nam Pham, Serge Michalet, Josselin Bodillis, Tien Dat Nguyen, Thi Kieu Oanh Nguyen, Thi Phuong Quynh Le, Mohamed Haddad, Sylvie Nazaret, Marie-Geneviève Dijoux-Franca
Plants adapt to metal stress by modifying their metabolism including the production of secondary metabolites in plant tissues. Such changes may impact the diversity and functions of plant associated microbial communities. Our study aimed to evaluate the influence of metals on the secondary metabolism of plants and the indirect impact on rhizosphere bacterial communities. We then compared the secondary metabolites of the hyperaccumulator Pteris vittata L. collected from a contaminated mining site to a non-contaminated site in Vietnam and identified the discriminant metabolites...
July 2017: Environmental Science and Pollution Research International
https://www.readbyqxmd.com/read/28540554/understanding-brassinosteroid-regulated-mechanisms-to-improve-stress-tolerance-in-plants-a-critical-review
#13
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...
July 2017: Environmental Science and Pollution Research International
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
#14
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
#15
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
#16
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 directly or indirectly, counteract abiotic and/or biotic stresses. In general, plants with a high root or shoot Si concentration are less prone to pest attack and exhibit enhanced tolerance to abiotic stresses such as drought, low temperature, or metal toxicity. However, the most remarkable 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...
August 4, 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
#17
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...
June 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
#18
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
#19
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
#20
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
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