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plant peroxidases

Yueyue Tian, Yunhe Zhao, Lixia Zhang, Wei Mu, Zhengqun Zhang
The tea green leafhopper, Empoasca onukii Matsuda (Hemiptera: Cicadellidae), is an economically important pest of tea crops, Camellia sinensis (L.) O. Kuntze (Ericales: Theaceae), in China. The morphological, physiological, and biochemical changes of two tea cultivars, the normal green tea cultivar 'Fudingdabai' and the novel chlorophyll-deficient albino cultivar 'Huangjinya', infested by E. onukii were investigated to determine the tolerance of different tea cultivars to E. onukii attack. E.onukii infestation affected the growth of tea plants, and decreased the shoot length, leaf area, leaf thickness, and stem diameter...
February 20, 2018: Journal of Economic Entomology
Wael M Semida, Khaulood A Hemida, Mostafa M Rady
During its life cycle, plant has to cope with a number of abiotic stresses including cadmium stress. Cadmium (Cd) is highly toxic to plant and greatly influences its growth and entire metabolism. Antioxidants have to enable plant to beat such stresses. Therefore, effects of ascorbate (AsA), proline (Pro) and glutathione (GSH) applied, as seed soaking solutions, singly or in a sequence on cucumber transplant growth, physio-biochemical attributes and antioxidant defense system activity were investigated under 2 mM Cd stress...
February 19, 2018: Ecotoxicology and Environmental Safety
Shivi Tyagi, Himani, Jaspreet K Sembi, Santosh Kumar Upadhyay
Glutathione peroxidases (GPXs) are redox sensor proteins that maintain a steady-state of H2 O2 in plant cells. They exhibit distinct sub-cellular localization and have diverse functionality in response to different stimuli. In this study, a total of 14 TaGPX genes and three splice variants were identified in the genome of Triticum aestivum and evaluated for various physicochemical properties. The TaGPX genes were scattered on the various chromosomes of the A, B, and D sub-genomes and clustered into five homeologous groups based on high sequence homology...
February 12, 2018: Journal of Plant Physiology
Cengiz Kaya, Muhammad Ashraf, Nudrat Aisha Akram
In the present experiment, we aimed to test the impact of hydrogen sulfide (H2 S) on growth, key oxidant such as hydrogen peroxide, mineral elements, and antioxidative defense in Capia-type red sweet pepper (Capsicum annuum L.) plants subjected to high concentration of zinc (Zn). A factorial experiment was designed with two Zn levels (0.05 and 0.5 mM) and 0.2 mM sodium hydrosulfide (NaHS) as a donor of H2 S supplied in combination plus nutrient solution through the root zone. High level of Zn led to reduce dry mass, chlorophyll pigments, fruit yield, leaf maximum fluorescence, and relative water content, but enhanced endogenous hydrogen peroxide (H2 O2 ), free proline, malondialdehyde (MDA), electrolyte leakage (EL), H2 S, as well as the activities of peroxidase (POD), catalase (CAT), and superoxide dismutase (SOD) enzymes...
February 21, 2018: Environmental Science and Pollution Research International
Yan Yang, Bing Zhang, Xiang Zhou, Jörg Romeis, Yufa Peng, Yunhe Li
Assessing the potential effects of insect-resistant genetically engineered (GE) plants on collembolans is important because these common soil arthropods may be exposed to insecticidal proteins produced in GE plants by ingestion of plant residues, crop pollen, or root exudates. Laboratory studies were conducted to evaluate the potential effects of two Bacillus thuringiensis ( Bt )-rice lines expressing Cry1C and Cry2A in pollen and leaves and of their non- Bt conventional isolines on the fitness of the collembolan Folsomia candida and on the activities of its antioxidant-related enzymes, superoxide dismutase and peroxidase, and of its detoxification-related enzymes, glutathione reductase and glutathione S -transferase...
2018: Frontiers in Plant Science
Yun-Yun Yan, Jun-Jun Wang, Xin-Yu Lan, Qing-Mei Wang, Fu-Liu Xu
To better monitor and remediate environments contaminated by cadmium (Cd), plants are used as hyperaccumulators or biomonitors; however, few have been identified for aquatic Cd pollution. In our study, two aquatic ornamental plants, Microsorum pteropus (Blume) Copel. and Echinodorus grisebachii Small, were studied for their Cd accumulation capacity, morphological characteristics, and leaf physiological indexes. Microsorum pteropus (Blume) Copel. leaf has the potential to hyperaccumulate Cd (166 mg/kg dry weight for 1 mg/L exposure), with no significant physiological difference under exposure...
February 20, 2018: Environmental Science and Pollution Research International
Carl J Houtman, Eranda Maligaspe, Christopher G Hunt, Elena Fernandez-Fueyo, Angel T Martínez, Kenneth E Hammel
Peroxidases are considered essential agents of lignin degradation by white-rot basidiomycetes. However, low-molecular-weight oxidants likely have a primary role in lignin breakdown because many of these fungi delignify wood before its porosity has sufficiently increased for enzymes to infiltrate. It has been proposed that lignin peroxidases (LiPs, EC fulfill this role by oxidizing the secreted fungal metabolite veratryl alcohol (VA) to its aryl cation radical (VA+• ), releasing it to act as a one-electron lignin oxidant within woody plant cell walls...
February 9, 2018: Journal of Biological Chemistry
D V Grigorieva, I V Gorudko, V A Kostevich, V B Vasilyev, S N Cherenkevich, O M Panasenko, A V Sokolov
Exocytosis of myeloperoxidase (MPO) from activated neutrophils in the presence of the anionic polysaccharide heparin was studied. It was determined that the optimal concentration of heparin (0.1 u/ml), at which there is no additional activation of cells (absence of amplification of exocytosis of lysozyme contained in specific and azurophilic granules). It was found that after preincubation of cells with heparin (0.1 u/ml) the exocytosis of MPO from neutrophils activated by various stimulants (fMLP, PMA, plant lectins CABA and PHA-L) increased compared to that under the action of activators alone...
January 2018: Biomedit︠s︡inskai︠a︡ Khimii︠a︡
Xiangli Sun, Yan Xu, Qiqiong Zhang, Xiuzhen Li, Zhongzheng Yan
The frequency and duration of tidal flooding significantly influence the bioavailability of heavy metals (HMs) in sediment and hence exert toxicological effects on coastal wetland plants. In this study, the combined effects of different water inundation times (3, 6, 9, and 12 h) and HMs (Cu, Zn, Pb, and Cr) on the photosynthesis and physiology of Spartina alterniflora were investigated under greenhouse conditions. Results showed that S. alterniflora was somehow tolerant to the combined HMs treatments, and only the highest level of HM treatment decreased leaf chlorophyll content...
February 14, 2018: Ecotoxicology and Environmental Safety
Fatemeh Hosseini, Mohammad Reza Mosaddeghi, Anthony Roger Dexter, Mozhgan Sepehri
Under combined drought and mechanical stresses, mechanical stress primarily controlled physiological responses of maize. Piriformospora indica mitigated the adverse effects of stresses, and inoculated maize experienced less oxidative damage and had better adaptation to stressful conditions. The objective of this study was to investigate the effect of maize root colonization by an endophytic fungus P. indica on plant water status, physiological traits and root morphology under combined drought and mechanical stresses...
February 16, 2018: Planta
Elizabeth M Entwistle, Karl J Romanowicz, William A Argiroff, Zachary B Freedman, J Jeffrey Morris, Donald R Zak
Here, we present evidence that ca. 20 yrs of experimental N deposition altered the composition of lignin-decaying class II peroxidases expressed by forest floor fungi, a response which has occurred concurrently with reductions in plant-litter decomposition and a rapid accumulation of soil organic matter. This finding suggests that anthropogenic N deposition has induced changes in the biological mediation of lignin-decay, the rate limiting step in plant litter decomposition. Thus, altered composition of transcripts for a critical gene that is associated with terrestrial C-cycling may explain increased soil C storage under long-term increases in anthropogenic N deposition...
February 16, 2018: Applied and Environmental Microbiology
Yong Ji, Peijun Wu, Jie Zhang, Jun Zhang, Youfeng Zhou, Yongwen Peng, Shifeng Zhang, Gaotang Cai, Guiqing Gao
In this research, Ganzhou Chinese Cabbage (Brassica rapa pekinensis), Native Purple Garlic (Allium sativum L) and Leping Radish (Raphanus sativus L) widely planted and distributed along the Le'an River were chosen in the present study. Soil physical-chemical properties, nutrients contents as well as heavy metals elements accumulated in both soils and vegetables collected from 24 sites were analyzed by lab analysis combined with statistical method which was also used for calculation of contamination factor, pollution indexes and hazardous index...
February 8, 2018: Chemosphere
Mileidy Cruz-Martín, Mayra Acosta-Suárez, Eilyn Mena, Berkis Roque, Tatiana Pichardo, Yelenys Alvarado-Capó
The effect of antifungal activity of culture filtrate (CF) of Bacillus pumilus strain CCIBP-C5, an isolate from a phyllosphere of banana ( Musa ) leaves, was determined on Pseudocercospora fijiensis challenged banana plants. The CF was shown to decrease the fungal biomass and induce changes in banana plant. In this sense, at 70 days post inoculation (dpi), a lower infection index as well as a decrease in fungal biomass after 6 dpi was obtained in treated plants with respect to control ones. At the same time, changes in the activities of several enzymes related to plant defense responses, such as phenylalanine ammonia lyase, chitinases, β-1,3-glucanases and peroxidases were observed...
February 2018: 3 Biotech
Tao Liu, Xiaohui Hu, Jiao Zhang, Junheng Zhang, Qingjie Du, Jianming Li
BACKGROUND: Low temperature is a crucial factor influencing plant growth and development. The chlorophyll precursor, 5-aminolevulinic acid (ALA) is widely used to improve plant cold tolerance. However, the interaction between H 2 O 2 and cellular redox signaling involved in ALA-induced resistance to low temperature stress in plants remains largely unknown. Here, the roles of ALA in perceiving and regulating low temperature-induced oxidative stress in tomato plants, together with the roles of H 2 O 2 and cellular redox states, were characterized...
February 15, 2018: BMC Plant Biology
Tahir Rasheed, Muhammad Bilal, Hafiz M N Iqbal, Hongbo Hu, Wei Wang, Xuehong Zhang
Owing to the ever-increasing environmental and health impacts associated with the discharge of dye-based effluents, effective remediation of industrial waste has become a top priority for the industrialists and environmental fraternity, around the world. In this context, plant-based peroxidases represent a suitable bio-remediating agent for the effective treatment of original dyes or dye-based colored wastewater effluents. In the present study, horseradish peroxidase was entrapped on a polyacrylamide gel and investigated its potential for the degradation and detoxification of an azo dye, methyl orange...
February 12, 2018: International Journal of Biological Macromolecules
Máximo Lorenzo, Marcela L Pinedo, María A Equiza, Paula V Fernández, Marina Ciancia, Darío G Ganem, Jorge A Tognetti
Temperate grasses, such as wheat, become compact plants with small, thick leaves after exposure to low temperature. These responses are associated with cold hardiness, but their underlying mechanisms remain largely unknown. Here we analyze the effects of low temperature on leaf morpho-anatomical structure, cell wall composition and the activity of extracellular peroxidases, which play key roles on cell elongation and cell wall thickening, in two wheat cultivars with contrasting cold-hardening abilities. A combined microscopic and biochemical approach was applied to study actively growing leaves of winter (ProINTA-Pincén) and spring (Buck-Patacón) wheat developed under constant warm (25 °C) or low (5 °C) temperature...
February 14, 2018: Plant Biology
Yan Li, Shanshan Xu, Zhiwei Wang, Lingchao He, Kang Xu, Genxuan Wang
Sugars play important roles in regulating plant growth, development and stomatal movement. Here, we found that glucose triggered stomatal closure, showing a dose-and time-dependent manner in Arabidopsis. Pharmacological data showed that glucose-induced stomatal closure was greatly inhibited by catalase (CAT, a reactive oxygen species (ROS) scavenger), diphenyleneiodonium chloride (DPI, an NADPH oxidase inhibitor), lanthanum chloride (LaCl3, a Ca2+ channel blocker), ethylene glycol tetraacetic acid (EGTA, a Ca2+ chelator), two nitrate reductase (NR) inhibitors, tungstate and sodium azide (NaN3), while not affected by salicylhydroxamic acid (SHAM, a peroxidase inhibitor)...
February 10, 2018: Journal of Experimental Botany
Renganathan Selvasundaram, Shanmugam Manoharan, Rajamanickam Buddhan, Mani Neelakandan, Radhakrishnan Murali Naidu
7,12-Dimethylbenz(a)anthracene (DMBA)-induced hamster buccal pouch carcinogenesis is widely preferred to assess the tumor-inhibiting efficacy of the medicinal plants or their constituents. The present study explores the tumor-inhibiting potential of esculetin by utilizing the status of lipid peroxidation by products (thiobarbituric acid reactive substances), antioxidants (vitamin E, reduced glutathione, superoxide dismutase, catalase, and glutathione peroxidase), and phase I and phase II detoxification agents as biochemical end points and by using histopathological studies as well in DMBA-induced hamster buccal pouch carcinogenesis...
February 12, 2018: Molecular and Cellular Biochemistry
Liping Huang, MengYao Zhang, Jing Jia, Xixi Zhao, Xingxiu Huang, E Ji, Lan Ni, Mingyi Jiang
OsLEA5 acts as a co-regulator of a transcriptional factor ZFP36 to enhance the expression and the activity of ascorbate peroxidase OsAPX1 to regulate seed germination in rice, but it it unknown whether OsLEA5 is also crucial in plant seedlings under stress conditions. To confirm it, we generated OsLEA5-overexpression and -knockdown rice plants. We found that overexpression of OsLEA5 in rice plants enhanced the tolerance to drought and salt stress; in contrast, an RNA interference (RNAi) mutant of OsLEA5 rice plants were more sensitive to drought and salinity...
February 7, 2018: Plant & Cell Physiology
Xia Jia, Chunyan Zhang, Yonghua Zhao, Tuo Liu, Yunhua He
Few studies have explored the long-term effects of elevated atmospheric CO2 combined with lead (Pb) contamination on plants. The objective of this study was to examine the effects of 3 years of elevated CO2 (700 ± 23 μmol mol-1) on Pb accumulation and plant defenses in leaves of Robinia pseudoacacia L. seedlings in exposed to Pb (500 mg kg-1 soil). Elevated CO2 increased Pb accumulation in leaves and Pb removal rate in soils. In plants exposed to Pb stress, total chlorophyll and carotenoid contents in leaves were lower under elevated CO2 than under ambient CO2, but seedling height and width increased under elevated CO2 relative to ambient CO2...
February 6, 2018: Journal of Hazardous Materials
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