Pretreatment with 24-Epibrassinolide Synergistically Protects Root Structures and Chloroplastic Pigments and Upregulates Antioxidant Enzymes and Biomass in Na+-Stressed Tomato Plants

2021 ◽  
Author(s):  
Vitor Quintela Sousa ◽  
Walter Fernando Serra Messias ◽  
Ynglety Cascaes Pereira ◽  
Breno Ricardo Serrão da Silva ◽  
Elaine Maria Silva Guedes Lobato ◽  
...  
Keyword(s):  
Antioxidant Enzymes ◽  
Tomato Plants ◽  
Chloroplastic Pigments

scholarly journals EFFECT ON 6-BAP CATALASE ACTIVITY IN TOMATO PLANTS UNDER CONDITIONS OF TEMPERATURE STRESS

2015 ◽  
Vol 4 (2) ◽  
pp. 96-99
Author(s):  
Tatyana Stepanovna Kolmykova ◽  
Ekaterina Vladimirovna Klokova ◽  
Elvera Shagidulovna Sharkaeva
Keyword(s):  
Enzyme Activity ◽  
Antioxidant Enzymes ◽  
Environmental Factors ◽  
Catalase Activity ◽  
Low Temperatures ◽  
High Ability ◽  
Tomato Plants ◽  
Resistance To Stress ◽  
Primary Antioxidant ◽  
A Minor

Activity of the antioxidant system is one of the mechanisms for the protection of plants against adverse environmental factors. Catalase - a primary antioxidant enzymes. Her change may serve as an indicator of plant resistance to stress. Studied catalase activity in tomato plants of different varieties under the action of low temperatures and cytokinin 6-BAP preparation. The object of investigation used 24- and 27-day-old tomato plant varieties Podarochnyi, Patrice, Volgogradskyi. Found that under the action of low temperatures, the decrease in positive catalase activity: 10-30% at 10 C and 40-60% at a temperature of 3 C as compared with non-refrigerated plants. Less resistant to hyperthermia were plant varieties Patrice. With increasing length of vegetation at a temperature of 25 C in 27-day-old tomato plants resulted in a minor increase in the activity of the enzyme. After the end of the cooling observed recovery of enzyme activity only at grades Podarochnyi and Patrice. This indicates that the indicated tomato varieties possess a high ability to restore metabolic processes. Using 6-regulator cytokinin BAP increased catalase activity in tomato plants as prolonged or momentary cooling. Especially responsive to the drug were plant varieties Patrice and Volgogradskyi. And 6-BAP helped repair catalase activity in 27-day-old plants in the aftereffect of cold stress. Were more sensitive plant varieties Podarochnyi.

scholarly journals Silicon Improves the Redox Homeostasis to Alleviate Glyphosate Toxicity in Tomato Plants—Are Nanomaterials Relevant?

Antioxidants ◽  
2021 ◽  
Vol 10 (8) ◽  
pp. 1320
Author(s):  
Cristiano Soares ◽  
Pedro Nadais ◽  
Bruno Sousa ◽  
Edgar Pinto ◽  
Isabel M. P. L. V. O. Ferreira ◽  
...  
Keyword(s):  
Antioxidant Enzymes ◽  
Abiotic Stresses ◽  
Superoxide Anion ◽  
Agricultural Soils ◽  
Foliar Application ◽  
Redox Homeostasis ◽  
Tomato Plants ◽  
Crop Tolerance ◽  
Solanum Lycopersicum L ◽  
Antioxidant Mechanisms

Given the widespread use of glyphosate (GLY), this agrochemical is becoming a source of contamination in agricultural soils, affecting non-target plants. Therefore, sustainable strategies to increase crop tolerance to GLY are needed. From this perspective and recalling silicon (Si)’s role in alleviating different abiotic stresses, the main goal of this study was to assess if the foliar application of Si, either as bulk or nano forms, is capable of enhancing Solanum lycopersicum L. tolerance to GLY (10 mg kg−1). After 28 d, GLY-treated plants exhibited growth-related disorders in both shoots and roots, accompanied by an overproduction of superoxide anion (O2•−) and malondialdehyde (MDA) in shoots. Although plants solely exposed to GLY have activated non-enzymatic antioxidant mechanisms (proline, ascorbate and glutathione), a generalized inhibition of the antioxidant enzymes was found, suggesting the occurrence of great redox disturbances. In response to Si or nano-SiO2 co-application, most of GLY phytotoxic effects on growth were prevented, accompanied with a better ROS removal, especially by an upregulation of the main antioxidant enzymes, including superoxide dismutase (SOD), catalase (CAT) and ascorbate peroxidase (APX). Overall, results pointed towards the potential of both sources of Si to reduce GLY-induced oxidative stress, without major differences between their efficacy.

scholarly journals Impact of Foliar Application of Chitosan Dissolved in Different Organic Acids on Isozymes, Protein Patterns and Physio-Biochemical Characteristics of Tomato Grown under Salinity Stress

Plants ◽  
2021 ◽  
Vol 10 (2) ◽  
pp. 388 ◽  
Author(s):  
Mohamed S. Attia ◽  
Mahmoud S. Osman ◽  
Amr S. Mohamed ◽  
Hany A. Mahgoub ◽  
Mohamed O. Garada ◽  
...  
Keyword(s):  
Ascorbic Acid ◽  
Antioxidant Enzymes ◽  
Citric Acid ◽  
Organic Acids ◽  
Salinity Stress ◽  
Photosynthetic Pigments ◽  
Morphological Traits ◽  
Foliar Application ◽  
Protein Patterns ◽  
Tomato Plants

In this study, the anti-stress capabilities of the foliar application of chitosan, dissolved in four different organic acids (acetic acid, ascorbic acid, citric acid and malic acid) have been investigated on tomato (Solanum lycopersicum L.) plants under salinity stress (100 mM NaCl). Morphological traits, photosynthetic pigments, osmolytes, secondary metabolites, oxidative stress, minerals, antioxidant enzymes activity, isozymes and protein patterns were tested for potential tolerance of tomato plants growing under salinity stress. Salinity stress was caused a reduction in growth parameters, photosynthetic pigments, soluble sugars, soluble proteins and potassium (K+) content. However, the contents of proline, ascorbic acid, total phenol, malondialdehyde (MDA), hydrogen peroxide (H2O2), sodium (Na+) and antioxidant enzyme activity were increased in tomato plants grown under saline conditions. Chitosan treatments in any of the non-stressed plants showed improvements in morphological traits, photosynthetic pigments, osmolytes, total phenol and antioxidant enzymes activity. Besides, the harmful impacts of salinity on tomato plants have also been reduced by lowering MDA, H2O2 and Na+ levels. Chitosan treatments in either non-stressed or stressed plants showed different responses in number and density of peroxidase (POD), polyphenol oxidase (PPO) and superoxide dismutase (SOD) isozymes. NaCl stress led to the diminishing of protein bands with different molecular weights, while they were produced again in response to chitosan foliar application. These responses were varied according to the type of solvent acid. It could be suggested that foliar application of chitosan, especially that dissolved in ascorbic or citric acid, could be commercially used for the stimulation of tomato plants grown under salinity stress.

scholarly journals Exogenous arginine modulates leaf antioxidant enzymes and hydrogen peroxide content in tomato plants under transient heat stresses

Bragantia ◽  
2021 ◽  
Vol 80 ◽  
Author(s):  
Vivyan Justi Conceição ◽  
Simone Costa Mello ◽  
Marcia Eugenia Amaral Carvalho ◽  
Salete Aparecida Gaziola ◽  
Ricardo Antunes Azevedo
Keyword(s):  
Hydrogen Peroxide ◽  
Antioxidant Enzymes ◽  
Tomato Plants ◽  
Peroxide Content

scholarly journals Nematicidal Volatiles from Bacillus atrophaeus GBSC56 Promote Growth and Stimulate Induced Systemic Resistance in Tomato against Meloidogyne incognita

2021 ◽  
Vol 22 (9) ◽  
pp. 5049
Author(s):  
Muhammad Ayaz ◽  
Qurban Ali ◽  
Ayaz Farzand ◽  
Abdur Rashid Khan ◽  
Hongli Ling ◽  
...  
Keyword(s):  
Oxidative Stress ◽  
Antioxidant Enzymes ◽  
Plant Growth ◽  
Plant Growth Promotion ◽  
Growth Promotion ◽  
Control Plant ◽  
Nematicidal Activity ◽  
Systemic Resistance ◽  
Tomato Plants ◽  
Nematicidal Volatiles

Bacillus volatiles to control plant nematodes is a topic of great interest among researchers due to its safe and environmentally friendly nature. Bacillus strain GBSC56 isolated from the Tibet region of China showed high nematicidal activity against M. incognita, with 90% mortality as compared with control in a partition plate experiment. Pure volatiles produced by GBSC56 were identified through gas chromatography and mass spectrometry (GC-MS). Among 10 volatile organic compounds (VOCs), 3 volatiles, i.e., dimethyl disulfide (DMDS), methyl isovalerate (MIV), and 2-undecanone (2-UD) showed strong nematicidal activity with a mortality rate of 87%, 83%, and 80%, respectively, against M. incognita. The VOCs induced severe oxidative stress in nematodes, which caused rapid death. Moreover, in the presence of volatiles, the activity of antioxidant enzymes, i.e., SOD, CAT, POD, and APX, was observed to be enhanced in M. incognita-infested roots, which might reduce the adverse effect of oxidative stress-induced after infection. Moreover, genes responsible for plant growth promotion SlCKX1, SlIAA1, and Exp18 showed an upsurge in expression, while AC01 was downregulated in infested plants. Furthermore, the defense-related genes (PR1, PR5, and SlLOX1) in infested tomato plants were upregulated after treatment with MIV and 2-UD. These findings suggest that GBSC56 possesses excellent biocontrol potential against M. incognita. Furthermore, the study provides new insight into the mechanism by which GBSC56 nematicidal volatiles regulate antioxidant enzymes, the key genes involved in plant growth promotion, and the defense mechanism M. incognita-infested tomato plants use to efficiently manage root-knot disease.

Sign in / Sign up

Export Citation Format

Share Document