scholarly journals Hydrogen peroxide acts as a signal molecule in CO2 laser pretreatment-induced osmotic tolerance in wheat seedling

2011 ◽  
Vol 57 (No. 9) ◽  
pp. 403-408 ◽  
Author(s):  
Z.B. Qiu ◽  
Q. Li ◽  
Z.Z. Bi ◽  
M. Yue
Keyword(s):  
Hydrogen Peroxide ◽  
Osmotic Stress ◽  
Protective Effect ◽  
Stress Responses ◽  
Wheat Seedling ◽  
Physiological Effect ◽  
Signal Molecule ◽  
Wheat Seedlings ◽  
Water Tolerance ◽  
Promotive Effect

The objective of this study was to test whether hydrogen peroxide (H<sub>2</sub>O<sub>2</sub>) is involved in laser pretreatment-induced water tolerance in wheat seedlings due to its nature as a second messenger in stress responses. The results showed that 3 min laser pretreatment could enhance water tolerance in wheat seedlings by decreasing the concentration of malondialdehyde (MDA), the production rate of superoxide radical (O<sub>2</sub><sup>&ndash;</sup>), and increasing the activities of superoxide dismutase (SOD), peroxidase (POD), catalase (CAT), ascorbate peroxidase (APX) and glutathione reductase (GR) and the concentration of glutathione (GSH), and having a positive physiological effect on the growth of osmotic stress seedlings. But the promotive effect of laser pretreatment-induced water tolerance in wheat seedling was effectively reversed by addition of 2 mmol AsA (ascorbic acid) or 5 &micro;mol DPI (diphenyle iodonium), but exogenous 100 U/mL CAT could not reversed laser pretreatment-induced protective effect on wheat seedlings under osmotic stress. The results suggest that H<sub>2</sub>O<sub>2</sub> metabolism was involved as signal in the processes of laser-induced water acclimation and laser-induced protective effect was shown to be likely related to NADPH oxidase-dependent H<sub>2</sub>O<sub>2</sub> production.

scholarly journals Genome-Wide Characterization and Identification of Trihelix Transcription Factor and Expression Profiling in Response to Abiotic Stresses in Rice (Oryza sativa L.)

2019 ◽  
Vol 20 (2) ◽  
pp. 251 ◽  
Author(s):  
Jiaming Li ◽  
Minghui Zhang ◽  
Jian Sun ◽  
Xinrui Mao ◽  
Jing Wang ◽  
...  
Keyword(s):  
Hydrogen Peroxide ◽  
Stress Responses ◽  
Abiotic Stresses ◽  
Developmental Stages ◽  
Oryza Sativa L ◽  
Expression Patterns ◽  
Rice Genome ◽  
High Salt ◽  
Pcr Analysis ◽  
Signal Molecule

Trihelix transcription factors play a role in plant growth, development and various stress responses. Here, we identified 41 trihelix family genes in the rice genome. These OsMSLs (Myb/SANT-LIKE) were located on twelve chromosomes. Synteny analysis indicated only six duplicated gene pairs in the rice trihelix family. Phylogenetic analysis of these OsMSLs and the trihelix genes from other species divided them into five clusters. OsMSLs from different groups significantly diverged in terms of gene structure and conserved functional domains. However, all OsMSLs contained the same five cis-elements. Some of these were responsive to light and dehydration stress. All OsMSLs expressed in four tissues and six developmental stages of rice but with different expression patterns. Quantitative real-time PCR analysis revealed that the OsMSLs responded to abiotic stresses including drought and high salt stress and stress signal molecule including ABA (abscisic acid), hydrogen peroxide. OsMSL39 were simultaneously expressed under all treatments, while OsMSL28 showed high expression under hydrogen peroxide, drought, and high salt treatments. Moreover, OsMSL16/27/33 displayed significant expression under ABA and drought treatments. Nevertheless, their responses were regulated by light. The expression levels of the 12 chosen OsMSLs differed between light and dark conditions. In conclusion, our results helped elucidate the biological functions of rice trihelix genes and provided a theoretical basis for further characterizing their biological roles in responding to abiotic stresses.

Protective effect of 24-epibrassinolide on wheat plants under water deficit

Biomics ◽  
2021 ◽  
Vol 13 (1) ◽  
pp. 47-53
Author(s):  
A.R. Lubynova ◽  
D.R. Maslennikova ◽  
F.M. Shakirova
Keyword(s):  
Hydrogen Peroxide ◽  
Polyethylene Glycol ◽  
Protective Effect ◽  
Water Deficit ◽  
Antioxidant System ◽  
Peroxidase Activity ◽  
Wheat Seedling ◽  
The State ◽  
Proline Content ◽  
Root Cells

We studied the effect of 24-epibrassinolide (EB) on growth, proline content, the state of wheat seedling antioxidant system under water deficit, modeled by 12% polyethylene glycol (PEG). It was found that under drought EB-pretreatment has a protective effect on wheat plants, stabilizing the state of the antioxidant system, regulating the balance of hydrogen peroxide and peroxidase activity, as well as inducing the additional accumulation of proline, which was reflected in maintaining a higher level of mitotic activity in apical root cells of these plants.

The effects of putrescine pre‐treatment on osmotic stress responses in drought‐tolerant and drought‐sensitive wheat seedlings

2020 ◽  
Author(s):  
Dilyana Doneva ◽  
Magda Pál ◽  
Liliana Brankova ◽  
Gabriella Szalai ◽  
Judit Tajti ◽  
...  
Keyword(s):  
Osmotic Stress ◽  
Stress Responses ◽  
Wheat Seedlings ◽  
Drought Tolerant ◽  
Pre Treatment

Physiological and anatomical responses of wheat to induced dehydration and rehydration

2013 ◽  
Vol 8 (5) ◽  
pp. 499-503
Author(s):  
Konstantina Kocheva ◽  
Peter Petrov ◽  
Georgi Georgiev
Keyword(s):  
Hydrogen Peroxide ◽  
Lipid Peroxidation ◽  
Osmotic Stress ◽  
Water Content ◽  
Relative Water Content ◽  
Water Status ◽  
Free Proline ◽  
Leaf Water Status ◽  
Wheat Seedlings ◽  
Relative Water

AbstractHydroponically grown wheat seedlings of two prominent Bulgarian cultivars (Katya and Prelom) were subjected to 48 h osmotic stress with PEG 8000 and were then rehydrated. The degree of stress was evaluated by monitoring relative water content, lipid peroxidation level, and accumulation of free proline and hydrogen peroxide in the leaves. Anatomy and ultrastructure of leaf tissue were observed under light microscopy. After imposition of stress, drought tolerant cultivar Katya displayed higher free proline content and significantly lower malondialdehyde and peroxide concentration in leaves than in the leaves of susceptible cultivar Prelom. After 24 h of rehydration Katya showed better ability to restore leaf water status and an apparent tendency towards recovery, whereas Prelom sustained higher levels of hydrogen peroxide, lipid peroxidation products and free proline and markedly low relative water content. Here, we have uncovered some of the characteristics displayed by cultivar Katya that enable it to survive and recover from severe osmotic stress. Interestingly, there was congruence between our results and the high level of cultivar Katya drought tolerance observed in the field.

scholarly journals A comparison of colorimetric assays detecting hydrogen peroxide in leaf extracts

2017 ◽  
Vol 9 (15) ◽  
pp. 2357-2360 ◽  
Author(s):  
Anikó Mátai ◽  
Éva Hideg
Keyword(s):  
Hydrogen Peroxide ◽  
Stress Responses ◽  
Plant Stress ◽  
Oxygen Species ◽  
Oxidizing Agent ◽  
Leaf Extracts ◽  
Signal Molecule ◽  
Central Molecule ◽  
Plant Stress Responses ◽  
Colorimetric Assays

Hydrogen peroxide (H2O2) is a central molecule in plant stress responses as a potential oxidizing agent or a signal molecule, depending on its localization and cellular concentrations. The work compares the versatility of three simple and rapid, potentially high through-put photometric assays to detect this reactive oxygen species in leaf extracts.

Protective effect of chitooligosaccharides on hydrogen peroxide-induced PC-12 cells death by inhibition of oxidative damage

2010 ◽  
Vol 34 (8) ◽  
pp. S27-S27
Author(s):  
Xueling Dai ◽  
Ping Chang ◽  
Ke Xu ◽  
Changjun Lin ◽  
Hanchang Huang ◽  
...  
Keyword(s):  
Hydrogen Peroxide ◽  
Oxidative Damage ◽  
Protective Effect ◽  
Pc 12 Cells ◽  
Cells Death

scholarly journals Optimal Nitrogen Supply Ameliorates the Performance of Wheat Seedlings under Osmotic Stress in Genotype-Specific Manner

Plants ◽  
2021 ◽  
Vol 10 (3) ◽  
pp. 493 ◽  
Author(s):  
Tania Kartseva ◽  
Anelia Dobrikova ◽  
Konstantina Kocheva ◽  
Vladimir Alexandrov ◽  
Georgi Georgiev ◽  
...  
Keyword(s):  
Osmotic Stress ◽  
Stress Tolerance ◽  
Wheat Variety ◽  
Growth And Yield ◽  
Physiological Status ◽  
Wheat Seedlings ◽  
Modern Variety ◽  
N Supply ◽  
N Assimilation ◽  
N Deficiency

Strategies and coping mechanisms for stress tolerance under sub-optimal nutrition conditions could provide important guidelines for developing selection criteria in sustainable agriculture. Nitrogen (N) is one of the major nutrients limiting the growth and yield of crop plants, among which wheat is probably the most substantial to human diet worldwide. Physiological status and photosynthetic capacity of two contrasting wheat genotypes (old Slomer and modern semi-dwarf Enola) were evaluated at the seedling stage to assess how N supply affected osmotic stress tolerance and capacity of plants to survive drought periods. It was evident that higher N input in both varieties contributed to better performance under dehydration. The combination of lower N supply and water deprivation (osmotic stress induced by polyethylene glycol treatment) led to greater damage of the photosynthetic efficiency and a higher degree of oxidative stress than the individually applied stresses. The old wheat variety had better N assimilation efficiency, and it was also the one with better performance under N deficiency. However, when both N and water were deficient, the modern variety demonstrated better photosynthetic performance. It was concluded that different strategies for overcoming osmotic stress alone or in combination with low N could be attributed to differences in the genetic background. Better performance of the modern variety conceivably indicated that semi-dwarfing (Rht) alleles might have a beneficial effect in arid regions and N deficiency conditions.

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