scholarly journals Zinc oxide nanocatalyst mediates cadmium and lead toxicity tolerance mechanism by differential regulation of photosynthetic machinery and antioxidant enzymes level in cotton seedlings

2021 ◽  
Vol 8 ◽  
pp. 295-302
Author(s):  
Priyanka N. ◽  
Geetha N. ◽  
Manish T. ◽  
Sahi S.V. ◽  
Venkatachalam P.
Keyword(s):  
Zinc Oxide ◽  
Antioxidant Enzymes ◽  
Lead Toxicity ◽  
Differential Regulation ◽  
Tolerance Mechanism ◽  
Photosynthetic Machinery ◽  
Cadmium And Lead

scholarly journals Differential regulation of antioxidant enzymes in response to oxidants.

1991 ◽  
Vol 266 (36) ◽  
pp. 24398-24403
Author(s):  
S. Shull ◽  
N.H. Heintz ◽  
M. Periasamy ◽  
M. Manohar ◽  
Y.M. Janssen ◽  
...  
Keyword(s):  
Antioxidant Enzymes ◽  
Differential Regulation

scholarly journals GROWTH AND PHYSIOLOGICAL RESPONSES OF TREE SPECIES (Hymenaea courbaril L., Peltophorum dubium (Spreng.) Taub. and Myroxylon peruiferum L. F.) EXPOSED TO DIFFERENT COPPER CONCENTRATIONS IN THE SOIL

2018 ◽  
Vol 42 (2) ◽  
Author(s):  
Daniele Maria Marques ◽  
Adriano Bortolotti Silva ◽  
José Ricardo Mantovani ◽  
Dalvana Sousa Pereira ◽  
Thiago Corrêa Souza
Keyword(s):  
Antioxidant Enzymes ◽  
Tree Species ◽  
Copper Content ◽  
Metal Tolerance ◽  
Physiological Responses ◽  
Forest Species ◽  
Hymenaea Courbaril ◽  
Tolerance Strategy ◽  
Photosynthetic Machinery ◽  
Biometric Measurements

ABSTRACT Copper (Cu) is an essential micronutrient for plants. However, when in excess, it becomes phytotoxic. In this context, the objective of this study was to evaluate the growth and physiological responses of tree species exposed to different copper concentrations in the soil. Three experiments were carried out, one for each forest species under study: Myroxylon peruiferum ("Óleo Bálsamo"), Hymenaea courbaril ("Jatobá") and Peltophorum dubium ("Canafístula"), with the same doses of copper (0, 50, 100, 200 and 400 mg kg-1). The experimental design was in randomized blocks (DBC), with five copper concentrations and four replicates. The plants were grown on soil substrate packed in 8-dm3 pots and kept in a greenhouse for 90 days. Biometric measurements, chlorophyll, antioxidant enzymes and copper content in tissues were evaluated. Copper did not influence the vegetative growth of the species studied. The content of chlorophyll "a" was reduced with increasing copper concentrations in the soil. H. courbaril had 56 to 92% copper retained in the roots, and the same behavior was observed for P. dubium (77-91%) and M. peruiferum (19-64%). In the three species studied, there was copper bioaccumulation, mainly in the roots, possibly as a metal tolerance strategy, preserving the most active tissues and the photosynthetic machinery. Cu translocation from roots to shoot was very restricted in all species. This behavior, associated with the increase in the activity of some antioxidant enzymes in plants, may indicate the phytoremediation potential of the studied species.

scholarly journals Attenuation of lead toxicity by promotion of tolerance mechanism in wheat roots by lipoic acid

2018 ◽  
Vol 46 (3) ◽  
pp. 424-435 ◽  
Author(s):  
H. Turk ◽  
S. Erdal ◽  
U. Karayel ◽  
R. Dumlupinar
Keyword(s):  
Lipoic Acid ◽  
Lead Toxicity ◽  
Tolerance Mechanism ◽  
Wheat Roots

Heavy metal contents of soils and plants adjacent to the Hume Highway near Marulan, New South Wales

1975 ◽  
Vol 15 (74) ◽  
pp. 414 ◽  
Author(s):  
DJ David ◽  
CH Williams
Keyword(s):  
Heavy Metal ◽  
Zinc Oxide ◽  
Heavy Metal Contamination ◽  
New South ◽  
Health Hazard ◽  
The United States ◽  
South Wales ◽  
Metal Contents ◽  
Cadmium And Lead ◽  
Relative Purity

HCL-extractable zinc, lead, cadmium and copper in soils as well as concentrations of these elements in bracken (Pteridium esculentum) were found to decrease along four leeward traverses at right angles to the Hume Highway near Marulan. Similar results were obtained for the above-ground portions of rye corn (Secale cereale) grown in a glasshouse on soils collected along one of these traverses. Zinc accession is similar to, but cadmium and lead accessions are considerably lower than, those observed by other workers in the United States probably owing in the case of cadmium to the use of purer zinc oxide in Australian tyre manufacture and in the case of lead to smaller cars and a smaller proportion of vehicles operating on leaded fuel. Zinc and cadmium analyses of Australian and foreign tyres confirmed the relative purity of the zinc oxide used in the manufacture of tyres in Australia. No serious health hazard appears to arise from heavy metal contamination of roadside soils and vegetation by vehicular traffic on the Hume Highway.

scholarly journals Can Ceylon Leadwort (Plumbago zeylanica L.) Acclimate to Lead Toxicity?—Studies of Photosynthetic Apparatus Efficiency

2020 ◽  
Vol 21 (5) ◽  
pp. 1866 ◽  
Author(s):  
Krzysztof M. Tokarz ◽  
Wojciech Makowski ◽  
Barbara Tokarz ◽  
Monika Hanula ◽  
Ewa Sitek ◽  
...  
Keyword(s):  
Antioxidant Enzymes ◽  
Photosynthetic Apparatus ◽  
Chloroplast Ultrastructure ◽  
Lead Toxicity ◽  
Protein Accumulation ◽  
Fluorescence Measurement ◽  
Reaction Centre ◽  
Donor Side ◽  
Plumbago Zeylanica ◽  
Pb Concentration

Ceylon leadwort (Plumbago zeylanica) is ornamental plant known for its pharmacological properties arising from the abundant production of various secondary metabolites. It often grows in lead polluted areas. The aim of presented study was to evaluate the survival strategy of P. zeylanica to lead toxicity via photosynthetic apparatus acclimatization. Shoots of P. zeylanica were cultivated on media with different Pb concentrations (0.0, 0.05, and 0.1 g Pb∙l−1). After a four-week culture, the efficiency of the photosynthetic apparatus of plants was evaluated by Chl a fluorescence measurement, photosynthetic pigment, and Lhcb1, PsbA, PsbO, and RuBisCo protein accumulation, antioxidant enzymes activity, and chloroplast ultrastructure observation. Plants from lower Pb concentration revealed no changes in photosynthetic pigments content and light-harvesting complex (LHCII) size, as well as no limitation on the donor side of Photosystem II Reaction Centre (PSII RC). However, the activity and content of antioxidant enzymes indicated a high risk of limitation on the acceptor side of Photosystem I. In turn, plants from 0.1 g Pb∙l−1 showed a significant decrease in pigments content, LHCII size, the amount of active PSII RC, oxygen-evolving complex activity, and significant remodeling of chloroplast ultrastructure indicated limitation of PSII RC donor side. Obtained results indicate that P. zeylanica plants acclimate to lead toxicity by Pb accumulation in roots and, depending on Pb concentration, by adjusting their photosynthetic apparatus via the activation of alternative (cyclic and pseudocyclic) electron transport pathways.

scholarly journals Glycine betaine-induced lead toxicity tolerance related to elevated photosynthesis, antioxidant enzymes suppressed lead uptake and oxidative stress in cotton

2014 ◽  
Vol 38 ◽  
pp. 281-292 ◽  
Author(s):  
Saima Aslam BHARWANA ◽  
Shafaqat ALI ◽  
Muhammad Ahsan FAROOQ ◽  
Naeem IQBAL ◽  
Amjad HAMEED ◽  
...  
Keyword(s):  
Oxidative Stress ◽  
Antioxidant Enzymes ◽  
Glycine Betaine ◽  
Lead Toxicity ◽  
Lead Uptake ◽  
And Oxidative Stress

scholarly journals Foliar application of zinc and selenium alleviates cadmium and lead toxicity of water spinach – Bioavailability/cytotoxicity study with human cell lines

2020 ◽  
Vol 145 ◽  
pp. 106122
Author(s):  
Lin Tang ◽  
Yasir Hamid ◽  
Di Liu ◽  
Md. Jahidul Islam Shohag ◽  
Afsheen Zehra ◽  
...  
Keyword(s):  
Cell Lines ◽  
Human Cell ◽  
Foliar Application ◽  
Lead Toxicity ◽  
Human Cell Lines ◽  
Water Spinach ◽  
Cadmium And Lead

Effects of zinc oxide nanoparticles on growth and antioxidant enzymes of Capsicum chinense

2018 ◽  
Vol 100 (5-7) ◽  
pp. 560-572 ◽  
Author(s):  
Josué Israel García-López ◽  
Ricardo Hugo Lira-Saldivar ◽  
Francisco Zavala-García ◽  
Emilio Olivares-Sáenz ◽  
Guillermo Niño-Medina ◽  
...  
Keyword(s):  
Zinc Oxide ◽  
Antioxidant Enzymes ◽  
Zinc Oxide Nanoparticles ◽  
Oxide Nanoparticles ◽  
Capsicum Chinense
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