Exogenous Silicon and Proline Modulate Osmoprotection and Antioxidant Activity in Cowpea Under Drought Stress

2022 ◽  
Author(s):  
Anderson Reges dos Santos ◽  
Yuri Lima Melo ◽  
Louise Fernandes de Oliveira ◽  
Igor Eneas Cavalcante ◽  
Rener Luciano de Souza Ferraz ◽  
...  
Keyword(s):  
Antioxidant Activity ◽  
Drought Stress

scholarly journals Antioxidant gene expression analysis and evaluation of total phenol content and oxygen-scavenging system in tea accessions under normal and drought stress conditions

2021 ◽  
Vol 21 (1) ◽  
Author(s):  
Mehdi Rahimi ◽  
Mojtaba Kordrostami ◽  
Fereshteh Mohamadhasani ◽  
Sanam Safaei Chaeikar
Keyword(s):  
Gene Expression ◽  
Antioxidant Activity ◽  
Antioxidant Enzymes ◽  
Drought Stress ◽  
Expression Analysis ◽  
Gene Expression Analysis ◽  
Stress Conditions ◽  
Total Phenol Content ◽  
Phenol Content ◽  
Oxygen Scavenging

Abstract Background Abiotic and biotic stresses induce oxidative processes in plant cells that this process starts with the production of ROSs which cause damage to the proteins. Therefore, plants have increased their antioxidant activity to defend against this oxidative stress to be able to handle stress better. In this research, 14 different tea accessions in a randomized complete block design with two replications were evaluated in two normal and drought stress conditions, and their antioxidant activity was measured by DPPH-free radicals’ assay and gene expression analysis. Results The results of gene expression analysis showed that the 100 and 399 accessions and Bazri cultivar had high values for most of the antioxidant enzymes, ascorbate peroxidase, superoxide dismutase, catalase, and peroxidase under drought stress conditions while the 278 and 276 accessions had the lowest amount of antioxidant enzymes in the same situation. Results showed that the IC50 of the BHT combination was 90.12 μg/ ml. Also, The IC50 of accessions ranged from 218 to 261 μg/ml and 201–264 μg/ml at normal and drought stress conditions, respectively. The 100 and 399 accessions showed the lowest IC50 under normal and drought stress conditions, while 278 and 276 accessions had the highest value for IC50. The antioxidant activity of tea accession extracts under normal conditions was ranged from 25 to 69% for accessions 278 and 100, respectively. While, the antioxidant activities of extracts under drought stress condition was 12 to 83% for accessions 276 and 100, respectively. So, according to the results, 100 and 399 accessions exhibited the least IC50 and more antioxidant activity under drought stress conditions and were identified as stress-tolerant accessions. However, 278 and 276 accessions did not show much antioxidant activity and were recognized as sensitive accessions under drought stress conditions. Conclusions These results demonstrate that total phenol content, antioxidant activity, and the oxygen-scavenging system can be used as a descriptor for identifying drought-tolerant accessions.

Inter‐relationship between photosynthetic efficiency, Δ 13 C, antioxidant activity and sugarcane yield under drought stress in field conditions

2019 ◽  
Vol 205 (5) ◽  
pp. 433-446 ◽  
Author(s):  
Laurício Endres ◽  
Claudiana Moura dos Santos ◽  
José Vieira Silva ◽  
Geraldo Veríssimo de Souza Barbosa ◽  
André Lucas Januário Silva ◽  
...  
Keyword(s):  
Antioxidant Activity ◽  
Drought Stress ◽  
Photosynthetic Efficiency ◽  
Field Conditions ◽  
Sugarcane Yield

scholarly journals Use of selenium to increase antioxidant activity and water use efficiency in arugula (Eruca vesicaria ssp. Sativa) exposed to drought stress

2020 ◽  
Vol 9 (12) ◽  
pp. e3291210670
Author(s):  
Danielle Paula de Oliveira Mangarotti ◽  
Roberto Rezende ◽  
Reni Saath ◽  
Tiago Luan Hachmann ◽  
Paula Toshimi Matumoto-Pintro ◽  
...  
Keyword(s):  
Antioxidant Activity ◽  
Drought Stress ◽  
Water Use Efficiency ◽  
Water Use ◽  
Block Design ◽  
Oxygen Species ◽  
Randomized Block Design ◽  
Small Doses ◽  
Growth Respiration ◽  
Use Efficiency

Environmental stress can directly or indirectly affect the formation of reactive oxygen species. Oxidative stress damages cell constituents such as carbohydrates, lipids, nucleic acids and proteins, reducing plant growth, respiration and photosynthesis. In recent decades, evidence has shown that small doses of selenium act as an antioxidant and plant biostimulant, promoting growth and improving resistance to abiotic stress such as drought. As such, the aim of this study was to assess the effect of selenium foliar feeding (0, 150 and 300 ppm) on the antioxidant activity, water use efficiency and yield traits of arugula grown with and without drought stress (50% and 100% ETc) in a protected environment. A randomized block design was used, with a 2x3 factorial scheme and four repetitions. Antioxidant activity increased in treatments with 150 ppm of fertilizer and exposure to drought stress. Plants in these treatments obtained higher water use efficiency, yield and leaf area values than those not submitted to drought stress.

scholarly journals Silicon-Mediated Physiological and Agronomic Responses of Maize to Drought Stress Imposed at the Vegetative and Reproductive Stages

Agronomy ◽  
2020 ◽  
Vol 10 (8) ◽  
pp. 1136
Author(s):  
Dongfeng Ning ◽  
Anzhen Qin ◽  
Zhandong Liu ◽  
Aiwang Duan ◽  
Junfu Xiao ◽  
...  
Keyword(s):  
Antioxidant Activity ◽  
Drought Stress ◽  
Leaf Area ◽  
Chlorophyll Content ◽  
Photosynthetic Rate ◽  
Antioxidant Activities ◽  
Soil Column ◽  
Yield Reduction ◽  
Leaf Water Content ◽  
Maize Yields

Silicon (Si) enhances maize resistance to drought. While previous studies have mainly focused on the seedling stage, the mediation of drought stress by Si imposed at the vegetative and reproductive stages has been rarely investigated. A soil-column experiment was thus conducted under a rainproof shelter to quantify the effect s of Si application on the physiological and agronomic responses of maize to drought stress imposed at the 6-leaf (D-V6), 12-leaf (D-V12), and blister (D-R2) stages. The observed parameters included plant growth, photosynthesis, osmolytes, antioxidant activity, and grain yield. The results showed that drought stress strongly decreased the leaf area, leaf water content, photosynthetic rate, chlorophyll content, and antioxidant activity (superoxide dismutase (SOD), peroxidase (POD), and catalase (CAT)) and markedly increased lipid peroxidation. D-V6, D-V12, and D-R2 decreased grain yields by 12.9%, 28.9%, and 44.8%, respectively, compared to the well-watered treatment (CK). However, Si application markedly increased leaf area, chlorophyll content, photosynthetic rate, osmolyte content, and enzymatic antioxidant activities (SOD, POD, and CAT), and decreased malondialdehyde (MDA) and superoxide radical accumulation, ultimately improving maize yields by 12.4%, 69.8%, and 80.8%, respectively, compared to the non-Si treated plants under drought stress at the V6, V12, and R2 stages. Furthermore, maize yields had a significant positive correlation with chlorophyll content and SOD and POD activity during the three stages. Our findings suggest that Si-induced changes in chlorophyll content and antioxidant activity might constitute important mechanisms for mitigating drought stress. In conclusion, this study provides physico-biochemical evidence for the beneficial role of Si in alleviating drought-induced yield reduction in maize, particularly during the late vegetative or early reproductive stages. Thus, Si application constitutes an effective approach for improving maize yield in rain-fed agricultural systems.

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