Effects of Different Treatments of Salicylic Acid on Heat Tolerance, Chlorophyll Fluorescence, and Antioxidant Enzyme Activity in Seedlings of Cucumis sativa L.

2006 ◽  
Vol 48 (2) ◽  
pp. 127-135 ◽  
Author(s):  
Qinghua Shi ◽  
Zhiyi Bao ◽  
Zhujun Zhu ◽  
Quansheng Ying ◽  
Qiongqiu Qian
Keyword(s):  
Enzyme Activity ◽  
Salicylic Acid ◽  
Chlorophyll Fluorescence ◽  
Antioxidant Enzyme ◽  
Heat Tolerance ◽  
Antioxidant Enzyme Activity ◽  
Cucumis Sativa

Response of antioxidant compounds to selenium and salicylic acid in wheat cultivars under dry land conditions

2013 ◽  
Vol 61 (1) ◽  
pp. 79-87 ◽  
Author(s):  
N. Sajedi ◽  
M. Boojar
Keyword(s):  
Enzyme Activity ◽  
Salicylic Acid ◽  
Grain Yield ◽  
Antioxidant Enzyme ◽  
Block Design ◽  
Seed Priming ◽  
Antioxidant Enzyme Activity ◽  
Antioxidant Compounds ◽  
Wheat Cultivars ◽  
Dry Land

In the present study, three dry land wheat cultivars, Azar 2, Sardary and Rasad, were tested for antioxidant enzyme activity, proline, malondialdehyde (MDA) and dityrosine (DT) content and grain yield after treatment with selenium and salicylic acid (SA). A factorial field experiment was carried out based on a completely randomized block design with three replicates. The experimental factors were three levels of salicylic acid (without SA; seed priming with 0.5 mM SA; seed priming + spraying with 1 mM SA) and two levels of selenium (0 and 20 g/ha). Significant increases in the activity of the superoxide dismutase (SOD), catalase (CAT) and glutathione peroxidase (GPX) enzymes and in the proline level were observed after treatment in the leaves of the three genotypes investigated, but this was associated with reduced MDA and DT content. The application of SA as seed priming and the foliar application of Se also increased the grain yield. These results suggest that cultivars exhibiting high antioxidant enzyme activity and proline content under dry land conditions may provide better drought tolerance in wheat.

scholarly journals Responses to drought stress modulate the susceptibility to Plasmopara viticola in grapevine

2020 ◽  
Author(s):  
Lisa Heyman ◽  
Antonios Chrysargyris ◽  
Kristof Demeestere ◽  
Nikolaos Tzortzakis ◽  
Monica Höfte
Keyword(s):  
Enzyme Activity ◽  
Salicylic Acid ◽  
Abscisic Acid ◽  
Drought Stress ◽  
Antioxidant Enzyme ◽  
Deficit Irrigation ◽  
Plasmopara Viticola ◽  
Antioxidant Enzyme Activity ◽  
The Other ◽  
In Planta

Abstract BackgroundClimate change will increase the occurrence of plants simultaneously suffering drought and pathogen stress. Although it is well-known that drought can alter the way plants respond to pathogens, knowledge about the effect of concurrent drought and biotic stress in grapevine is scarce. This is especially true for Plasmopara viticola, the causal agent of grapevine downy mildew. This research addresses how vines with different drought tolerance respond to the challenge with P. viticola, drought stress or their combination, and how one stress affects the other. ResultsArtificial inoculation was performed on two cultivars, exposed to full or deficit irrigation, in the Mediterranean climate of Cyprus. In parallel, leaf disks from these plants were inoculated in controlled conditions. Leaves were sampled at an early infection stage to determine the influence of the single and combined stresses on oxidative parameters, chlorophyll, and phytohormones. Under irrigation, the local Cypriot cultivar Xynisteri was more susceptible to P. viticola than the drought-sensitive Chardonnay. The successful infection by P. viticola at 1.5 days post inoculation was associated with high levels of indole-3-acetic acid (IAA), salicylic acid (SA), jasmonic acid (JA), and proline and strong decreases in antioxidant enzyme activity. Drought, on the other hand, triggered the accumulation of IAA and abscisic acid (ABA), which antagonized JA and SA. Exposure to drought stress increased the susceptibility to P. viticola of the leaves inoculated in controlled conditions. Conversely, both cultivars showed resistance against P. viticola when inoculated in planta under continued deficit irrigation. Despite their resistance, the pathogen-associated responses in IAA, antioxidant enzyme activity, and proline still occurred in these drought-stressed plants. Surprisingly, abscisic acid, rather than the generally implicated jasmonic and salicylic acid, seemed to play a prominent role in this resistance. ConclusionsDrought exposure increased the susceptibility of in vitro inoculated leaves. Conversely, deficit irrigation induced resistance to P. viticola in both Chardonnay and Xynisteri when inoculated in planta. ABA, rather than JA and SA, was implicated in this resistance. The irrigation-dependent susceptibility highlights that the changing climate and the practices used to mitigate its effects, may have a profound impact on plant pathogens.

scholarly journals Improvement in Heat Tolerance of Creeping Bentgrass with Melatonin, Rutin, and Silicon

2019 ◽  
Vol 144 (2) ◽  
pp. 141-148 ◽  
Author(s):  
Emily B. Merewitz ◽  
Sha Liu
Keyword(s):  
Lipid Peroxidation ◽  
Enzyme Activity ◽  
Heat Stress ◽  
Fatty Acid ◽  
Linoleic Acid ◽  
Antioxidant Enzyme ◽  
Heat Tolerance ◽  
Acid Content ◽  
Creeping Bentgrass ◽  
Antioxidant Enzyme Activity

Naturally derived products that may enhance the functionality of fertilizers or other agricultural inputs are needed to reduce inputs associated with stress damage and increase the sustainability of turfgrass management. Damage to high-value creeping bentgrass (Agrostis stolonifera) turf areas caused by heat stress is a widespread problem. This study aimed to evaluate multiple, diverse treatments that may illicit antioxidant responses in plants, melatonin, rutin, and Si, when applied as foliar pretreatments to heat stress. Creeping bentgrass plants were grown in growth chambers at optimal (23 °C) or heat stress conditions (35 °C). Turfgrass quality, chlorophyll content, leaf electrolyte leakage, photochemical efficiency, lipid peroxidation, antioxidant enzyme activity, and fatty acid content were measured to determine the effects of foliar treatments on heat stress responses. Melatonin, Si, and rutin were all found to improve some or all of the physiological parameters measured in the study, but only melatonin and Si reduced lipid peroxidation, increased antioxidant enzyme activity, and altered fatty acid contents. Melatonin- and Si-treated plants had greater superoxide dismutase and peroxidase activity and increased the content of the unsaturated fatty acid, linoleic acid, in creeping bentgrass leaves during heat stress compared with controls. Rutin improved turf quality and reduced electrolyte leakage during heat stress, but the mechanism associated with these changes is unclear because no changes were found in antioxidant enzyme activities or fatty acids. Melatonin and Si treatment promoted antioxidant enzyme activity and linoleic acid content of leaves, which have been associated with the improved heat tolerance of creeping bentgrass plants.

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