Diurnal changes of the ascorbate-glutathione cycle components in wheat genotypes exposed to drought

2020 ◽  
Vol 47 (11) ◽  
pp. 998
Author(s):  
Durna R. Aliyeva ◽  
Lala M. Aydinli ◽  
Ismayil S. Zulfugarov ◽  
Irada M. Huseynova
Keyword(s):  
Drought Stress ◽  
Enzyme Activities ◽  
Reductase Activity ◽  
Triticum Aestivum L ◽  
Soil Drought ◽  
Antioxidant Enzyme Activities ◽  
Diurnal Changes ◽  
Major Pathway ◽  
Wheat Genotypes ◽  
Antioxidative Enzyme Activities

The ascorbate-glutathione (AsA-GSH) cycle is a major pathway of H2O2 scavenging in plants. The effect of diurnal variations in hydrogen peroxide (H2O2) content, the intensity of lipid peroxidation (malondialdehyde, MDA), photosynthesis, antioxidants and antioxidative enzyme activities involved in AsA-GSH metabolism has been studied comparatively in leaves of durum (Triticum durum Desf.) and bread (Triticum aestivum L.) wheat genotypes exposed to soil drought. Drought stress caused an increase in the content of H2O2, MDA, alterations in the activities of AsA-GSH cycle enzymes and quantitative changes in AsA and GSH content during the day. PSII efficiency was significantly lower in the control and drought exposed leaves at the highest temperature in the afternoon. The ascorbate peroxidase activity was found to increase and ascorbic acid amount decreased with increasing temperature during the day. Further, the glutathione amount and glutathione reductase activity increased at the expense of the regeneration of the oxidised form of glutathione. Our results revealed that wheat can tolerate drought stress by enhancing the antioxidant enzyme activities and alteration of the concentration of ascorbate and glutathione.

scholarly journals Study of silicon effects on antioxidant enzyme activities and osmotic adjustment of wheat under drought stress

2011 ◽  
Vol 47 (No. 1) ◽  
pp. 17-27 ◽  
Author(s):  
S. Tale Ahmad ◽  
R. Haddad
Keyword(s):  
Drought Stress ◽  
Antioxidant Enzyme ◽  
Osmotic Adjustment ◽  
Enzyme Activities ◽  
Soluble Protein ◽  
Membrane Damage ◽  
Triticum Aestivum L ◽  
Growth Stages ◽  
Antioxidant Enzyme Activities ◽  
Randomized Design

The effect of silicon (Si) was investigated on the major antioxidant enzyme activities including superoxide dismutase (SOD), catalase (CAT), ascorbate peroxidase (APX), peroxidase (POD), relative water content (RWC), chlorophyll and soluble protein contents, proline (Pro) and glycine betaine (GB) accumulation in three different growth stages (2<sup>nd</sup>, 4<sup>th</sup> leaf and tillering stages) of wheat (Triticum aestivum L.) plants under drought stress. The experiment was performed in a completely randomized design for three treatments including control, drought and Si-drought (2mM silicate sodium/kg) with three replications in a greenhouse. The results indicated that Si partially offset the negative impacts of drought stress increasing the tolerance of wheat by rising Pro and GB accumulation and soluble protein content. Compared with the plants treated with drought, applied Si significantly enhanced the activities of SOD, CAT, APX and POD. In contrast, drought stress caused a considerable decrease in RWC, chlorophyll and soluble protein contents. This Si effect was time-dependent and became stronger in the tillering stage. The results of the present experiment coincided with the conclusion that Si alleviates water deficit of wheat by preventing the oxidative membrane damage and may be associated with plant osmotic adjustment.

Effects of soil drought stress on photosynthetic characteristics and antioxidant enzyme activities inHippophae rhamnoidesLinn. seedings

2013 ◽  
Vol 33 (5) ◽  
pp. 1386-1396 ◽  
Author(s):  
裴斌 PEI Bin ◽  
张光灿 ZHANG Guangcan ◽  
张淑勇 ZHANG Shuyong ◽  
吴芹 WU Qin ◽  
徐志强 XU Zhiqiang ◽  
...  
Keyword(s):  
Drought Stress ◽  
Antioxidant Enzyme ◽  
Enzyme Activities ◽  
Photosynthetic Characteristics ◽  
Soil Drought ◽  
Antioxidant Enzyme Activities

Effects of Nitric Oxide Application on Antioxidant Enzyme Activities of Pepper Plants under Drought Stress

2021 ◽  
Vol 5 (4) ◽  
pp. 846-853
Author(s):  
Fikret YAŞAR ◽  
Özlem ÜZAL
Keyword(s):  
Nitric Oxide ◽  
Drought Stress ◽  
Plant Growth ◽  
Nutrient Solution ◽  
Enzyme Activities ◽  
Growth Parameters ◽  
Antioxidative Enzyme ◽  
High Dose ◽  
Antioxidant Enzyme Activities ◽  
Hoagland Nutrient Solution

The purpose of the study was to determine the relationship between the messenger molecule Nitric oxide (NO) and antioxidative enzyme (SOD: Superoxide Dismutase; CAT: Catalase; APX: Ascorbate Peroxidase) activities in some metabolic changes that occur under the effect of drought stress in plants, to determine the possible roles of Nitric Oxide and to obtain complementary information. The experiment conducted in a controlled environment, and plant were cultured in containers containing Hoagland nutrient solution. For drought stress application, 10% Polyethylene Glycol (PEG 6000) was added to the nutrient solution, which is equivalent to -0.40 MPa osmotic potential. Before the drought stress is applied, pepper seedlings of Demre cv were pre-treated with different doses of Sodium Nitroprusside (SNP) and Carboxy-PTIO (potassium salt) (cPTIO) (SNP 0.01, SNP 1, SNP 100 and SNP 0.01 + cPTIO, SNP + cPTIO, SNP 100+ cPTIO). On the 10th day of the drought application, the growth parameters of the plants; the plant fresh weights and their Antioxidative Enzyme Activities (SOD, CAT, APX) were determined. In terms of plant growth parameters, both plant growth and antioxidant anzyme activities of plants pretreated with 0.01 and 1 doses of SNP were lower than the high dose of SNP and the PEG application without pretreatment. The reason for the low enzyme activities in these applications can be attributed to factors such as the excess accumulation of organic acids such as proline in the cells of the plants and the decrease in H2O2 and O-2 levels in the presence of SNP.

scholarly journals Yield and yield traits of durum wheat (Triticum durum desf.) and bread wheat (Triticum aestivum L.) genotypes under drought stress

Genetika ◽  
2016 ◽  
Vol 48 (2) ◽  
pp. 717-727
Author(s):  
Tofig Allahverdiyev
Keyword(s):  
Water Stress ◽  
Drought Stress ◽  
Durum Wheat ◽  
Bread Wheat ◽  
Geometric Mean ◽  
Triticum Aestivum L ◽  
Tolerance Index ◽  
Yield Traits ◽  
Wheat Genotypes ◽  
Spike Number

Field experiment was conducted to study the effect of water stress on yield and yield traits of durum wheat and bread wheat genotypes. Water stress caused significant reduction in plant height (PH), peduncle length (PL), spike number/m2(SN), spike length (SL), spike width (SW), spikelets number/spike (SNS), spike mass (SM), grain number/spike (GNS), grain mass/spike (GMS), biological yield (BY), thousand kernel mass (TKM), grain yield (GY) and harvest index (HI). Wheat traits such as SN, SM, BY, TKM, GY were more vulnerable to drought stress. Positive significant correlation of GY with SN, BY and HI under rain-fed condition was found. Genotypes of durum wheat were more sensitive to drought than that bread wheat genotypes. The significant and positive correlation of GY with Stress Tolerance Index (STI), Mean Productivity (MP) and Geometric Mean Productivity (GMP) indicated that these indices were more effective in identifying high yielding, drought tolerance genotypes.

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