Changes in chloroplast ultrastructure of tobacco plants in the course of protection from oxidative stress under hypothermia

2016 ◽  
Vol 63 (3) ◽  
pp. 301-307 ◽  
Author(s):  
V. N. Popov ◽  
O. V. Antipina ◽  
N. V. Astakhova
Keyword(s):  
Oxidative Stress ◽  
Chloroplast Ultrastructure ◽  
Tobacco Plants

scholarly journals Phytotoxicity of Silver Nanoparticles on Tobacco Plants: Evaluation of Coating Effects on Photosynthetic Performance and Chloroplast Ultrastructure

Nanomaterials ◽  
2021 ◽  
Vol 11 (3) ◽  
pp. 744
Author(s):  
Petra Peharec Štefanić ◽  
Karla Košpić ◽  
Daniel Mark Lyons ◽  
Lara Jurković ◽  
Biljana Balen ◽  
...  
Keyword(s):  
Silver Nanoparticles ◽  
Cetyltrimethylammonium Bromide ◽  
Photosynthetic Apparatus ◽  
Chloroplast Ultrastructure ◽  
Photosynthetic Performance ◽  
Pigment Content ◽  
Inhibitory Effects ◽  
Tobacco Plants ◽  
Agriculture And Food ◽  
The Impact

Silver nanoparticles (AgNPs) are the most exploited nanomaterial in agriculture and food production, and their release into the environment raises concern about their impact on plants. Since AgNPs are prone to biotransformation, various surface coatings are used to enhance their stability, which may modulate AgNP-imposed toxic effects. In this study, the impact of AgNPs stabilized with different coatings (citrate, polyvinylpyrrolidone (PVP), and cetyltrimethylammonium bromide (CTAB)) and AgNO3 on photosynthesis of tobacco plants as well as AgNP stability in exposure medium have been investigated. Obtained results revealed that AgNP-citrate induced the least effects on chlorophyll a fluorescence parameters and pigment content, which could be ascribed to their fast agglomeration in the exposure medium and consequently weak uptake. The impact of AgNP-PVP and AgNP-CTAB was more severe, inducing a deterioration of photosynthetic activity along with reduced pigment content and alterations in chloroplast ultrastructure, which could be correlated to their higher stability, elevated Ag accumulation, and surface charge. In conclusion, intrinsic properties of AgNP coatings affect their stability and bioavailability in the biological medium, thereby indirectly contributing changes in the photosynthetic apparatus. Moreover, AgNP treatments exhibited more severe inhibitory effects compared to AgNO3, which indicates that the impact on photosynthesis is dependent on the form of Ag.

Transgenic Tobacco Plants With an Improved Tolerance Towards Oxidative Stress in Chloroplasts

1995 ◽  
pp. 3129-3134
Author(s):  
L. Slooten ◽  
W. van Camp ◽  
S. Kushnir ◽  
J. Botterman ◽  
M. van Montagu ◽  
...  
Keyword(s):  
Oxidative Stress ◽  
Transgenic Tobacco ◽  
Transgenic Tobacco Plants ◽  
Tobacco Plants

Effect of cytokinins on oxidative stress in tobacco plants under nitrogen deficiency

2011 ◽  
Vol 72 (2) ◽  
pp. 167-173 ◽  
Author(s):  
M.M. Rubio-Wilhelmi ◽  
E. Sanchez-Rodriguez ◽  
M.A. Rosales ◽  
Blasco Begoña ◽  
J.J. Rios ◽  
...  
Keyword(s):  
Oxidative Stress ◽  
Nitrogen Deficiency ◽  
Tobacco Plants

scholarly journals Overexpression of plastidial thioredoxins f and m differentially alters photosynthetic activity and response to oxidative stress in tobacco plants

2013 ◽  
Vol 4 ◽  
Author(s):  
Pascal Rey ◽  
Ruth Sanz-Barrio ◽  
Gilles Innocenti ◽  
Brigitte Ksas ◽  
Agathe Courteille ◽  
...  
Keyword(s):  
Oxidative Stress ◽  
Photosynthetic Activity ◽  
Tobacco Plants

scholarly journals Response to oxidative stress induced by cadmium and copper in tobacco plants (Nicotiana tabacum) engineered with the trehalose-6-phosphate synthase gene (AtTPS1)

2013 ◽  
Vol 36 (3) ◽  
pp. 755-765 ◽  
Author(s):  
Luisa Louro Martins ◽  
Miguel Pedro Mourato ◽  
Sergio Baptista ◽  
Rafaela Reis ◽  
Florbela Carvalheiro ◽  
...  
Keyword(s):  
Oxidative Stress ◽  
Nicotiana Tabacum ◽  
Tobacco Plants ◽  
Phosphate Synthase

scholarly journals Excess Zinc Supply Reduces Cadmium Uptake and Mitigates Cadmium Toxicity Effects on Chloroplast Structure, Oxidative Stress, and Photosystem II Photochemical Efficiency in Salvia sclarea Plants

Toxics ◽  
2022 ◽  
Vol 10 (1) ◽  
pp. 36
Author(s):  
Ilektra Sperdouli ◽  
Ioannis-Dimosthenis S. Adamakis ◽  
Anelia Dobrikova ◽  
Emilia Apostolova ◽  
Anetta Hanć ◽  
...  
Keyword(s):  
Oxidative Stress ◽  
Photosystem Ii ◽  
Adverse Effects ◽  
Cadmium Toxicity ◽  
Photochemical Efficiency ◽  
Antimicrobial Properties ◽  
Chloroplast Ultrastructure ◽  
Salvia Sclarea ◽  
Psii Photochemistry ◽  
Hoagland Nutrient Solution

Salvia sclarea L. is a Cd2+ tolerant medicinal herb with antifungal and antimicrobial properties cultivated for its pharmacological properties. However, accumulation of high Cd2+ content in its tissues increases the adverse health effects of Cd2+ in humans. Therefore, there is a serious demand to lower human Cd2+ intake. The purpose of our study was to evaluate the mitigative role of excess Zn2+ supply to Cd2+ uptake/translocation and toxicity in clary sage. Salvia plants were treated with excess Cd2+ (100 μM CdSO4) alone, and in combination with Zn2+ (900 μM ZnSO4), in modified Hoagland nutrient solution. The results demonstrate that S. sclarea plants exposed to Cd2+ toxicity accumulated a significant amount of Cd2+ in their tissues, with higher concentrations in roots than in leaves. Cadmium exposure enhanced total Zn2+ uptake but also decreased its translocation to leaves. The accumulated Cd2+ led to a substantial decrease in photosystem II (PSII) photochemistry and disrupted the chloroplast ultrastructure, which coincided with an increased lipid peroxidation. Zinc application decreased Cd2+ uptake and translocation to leaves, while it mitigated oxidative stress, restoring chloroplast ultrastructure. Excess Zn2+ ameliorated the adverse effects of Cd2+ on PSII photochemistry, increasing the fraction of energy used for photochemistry (ΦPSII) and restoring PSII redox state and maximum PSII efficiency (Fv/Fm), while decreasing excess excitation energy at PSII (EXC). We conclude that excess Zn2+ application eliminated the adverse effects of Cd2+ toxicity, reducing Cd2+ uptake and translocation and restoring chloroplast ultrastructure and PSII photochemical efficiency. Thus, excess Zn2+ application can be used as an important method for low Cd2+-accumulating crops, limiting Cd2+ entry into the food chain.

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