Salicylic Acid Induced Alteration in Dry Matter Partitioning, Antioxidant Defence System and Yield in Chickpea (Cicer arietinum L.) under Drought Stress

2012 ◽  
Vol 4 (3) ◽  
pp. 86-102 ◽  
Author(s):  
Pradeep Kumar Patel ◽  
A. Hemantaran
Keyword(s):  
Salicylic Acid ◽  
Drought Stress ◽  
Cicer Arietinum ◽  
Dry Matter ◽  
Antioxidant Defence ◽  
Dry Matter Partitioning ◽  
Cicer Arietinum L ◽  
Defence System ◽  
Antioxidant Defence System

Exogenous spermidine improves drought tolerance in maize by enhancing the antioxidant defence system and regulating endogenous polyamine metabolism

2018 ◽  
Vol 69 (11) ◽  
pp. 1076 ◽  
Author(s):  
Lijie Li ◽  
Wanrong Gu ◽  
Congfeng Li ◽  
Wenhua Li ◽  
Caifeng Li ◽  
...  
Keyword(s):  
Drought Stress ◽  
Crop Production ◽  
Arginine Decarboxylase ◽  
Polyamine Metabolism ◽  
Monodehydroascorbate Reductase ◽  
Antioxidant Defence ◽  
Defence System ◽  
Maize Cultivars ◽  
Antioxidant Defence System ◽  
Exogenous Spermidine

Drought stress is a primary abiotic constraint affecting crop production worldwide. In this study, the role of exogenous spermidine (Spd) in conferring drought-stress-tolerance in maize (Zea mays L.) seedlings was studied by analysing polyamine metabolism and the antioxidant defence system. Two maize cultivars, Xianyu 335 (drought resistant) and Fenghe 1 (drought susceptible), were subjected to drought stress (–0.8 MPa) induced by 15% polyethylene glycol 6000 with or without Spd (0.1 mm) application. Spd significantly reduced the inhibition of plant growth and decreased malondialdehyde and hydrogen peroxide contents and the generation rate of oxidised glutathione caused by drought stress, particularly in Fenghe 1. The activities of superoxide dismutase, ascorbate peroxidase and glutathione reductase further increased with the application of Spd to the stressed plants. Application of Spd significantly moderated the drought-induced reduction in activities of monodehydroascorbate reductase and dehydroascorbate and the ratio ascorbate : dehydroascorbate and reduced the ratio glutathione : oxidised glutathione. With the application of Spd, the contents of Spd and spermine and the activities of arginine decarboxylase, S-adenosyl methionine decarboxylase and diamine oxidase increased significantly in the stressed plants, and the increases were greater in Xianyu 335 than in Fenghe 1. Thus, exogenous Spd successfully reduced oxidative damage by enhancing the antioxidant components, raising the redox state of ascorbate and glutathione, and altering the polyamine pool, which play important roles in improving physiological characteristics and drought stress in maize.

Comparative effects of gibberellic acid, kinetin and salicylic acid on emergence, seedling growth and the antioxidant defence system of sweet sorghum (Sorghum bicolor) under salinity and temperature stresses

2015 ◽  
Vol 66 (2) ◽  
pp. 145 ◽  
Author(s):  
Nimir Eltyb Ahmed Nimir ◽  
Shiyuan Lu ◽  
Guisheng Zhou ◽  
Wenshan Guo ◽  
Baoluo Ma ◽  
...  
Keyword(s):  
Salicylic Acid ◽  
High Temperature ◽  
Seedling Growth ◽  
Sweet Sorghum ◽  
Dry Weight ◽  
Seed Priming ◽  
Antioxidant Defence ◽  
Defence System ◽  
Antioxidant Defence System ◽  
Emergence Percentage

Salinity and high temperature are major abiotic stresses limiting sustainable crop production. Seed priming is a useful tool to enhance seedling growth and the antioxidant defence system of crops under salinity and temperature stress. This experiment was designed to determine the effects of gibberellic acid (GA3, 288.7 µm), kinetin (232.2 µm) and salicylic acid (362 µm) on some morphological and physiological parameters of sweet sorghum (Sorghum bicolor L. Moench) hybrid Yajin 13 under salinity (0, 100 and 200 mm NaCl) and temperature (25°C and 37°C) stress. Salinity and high temperature significantly reduced emergence percentage, shoot and root lengths, number of leaves, shoot fresh and dry weight, and chlorophyll a and b content. The activity of superoxide dismutase (SOD) and malondialdehyde (MDA) content were increased with an increase in both salinity and temperature stress. Hormone treatments positively affected all parameters except root fresh and dry weight, number of leaves, SOD activity and chlorophyll a. Under salinity stress at 200 mm NaCl, treatment with salicylic acid increased emergence percentage, emergence rate, chlorophyll b and protein content by 82.0%, 130%, 7.9% and 1.9%, respectively, relative to the control (no treatment). At 37°C, salicylic acid increased emergence percentage, emergence rate and number of roots by 72.5%, 108.5% and 63.8%, respectively, and decreased MDA content by 17.6% relative to the control. Our study indicated that seed priming with an appropriate concentration of exogenous hormones (salicylic acid, kinetin, GA3) is a useful, easy method for improving germination, seedling growth and the antioxidant defence system of sweet sorghum under conditions of high temperature and salinity.

scholarly journals Stage specific upregulation of antioxidant defence system in leaves for regulating drought tolerance in chickpea

2014 ◽  
Vol 6 (2) ◽  
pp. 326-337 ◽  
Author(s):  
H. K. Oberoi ◽  
A. K. Gupta ◽  
S. Kaur ◽  
I. Singh
Keyword(s):  
Hydrogen Peroxide ◽  
Drought Stress ◽  
Drought Tolerance ◽  
Vegetative Stage ◽  
Antioxidant Defence ◽  
Seed Filling ◽  
Defence System ◽  
Antioxidant Defence System ◽  
Young Leaves ◽  
The Impact

Leaf is one of the early sensors for the drought stress and is important to study drought tolerance mechanism. Activities of antioxidative enzymes and status of malondialdehyde (MDA), hydrogen peroxide (H2O2), proline and total phenols were studied in leaves of drought tolerant (PDG 3 and PDG 4) and susceptible (PBG 1, GPF 2, PBG 5, L 550 and BG1053) chickpea cultivars under irrigated and rainfed conditions at different development stages. In general, with the age of plant, the activities of superoxide dismutase (SOD) and catalase (CAT) increased but the activities of glutathione reductase (GR), ascorbate peroxidase (APX) and peroxidase (POX) decreased in leaves. With some exceptions, in general, higher status of APX and POX in leaves at vegetative stage I (30 days after sowing) and II (60 days after sowing); GR at vegetative stage II and pre-flowering stage and SOD and CAT at seed filling stages in tolerant cultivars under drought stress reflected stage specific upregulation of antioxidant defence system in them. The relatively lower activities of APX and POX in old leaves during seed filling stage make them more prone to enhanced oxidative injury than the young leaves. Lower content of hydrogen peroxide and malondialdehyde in leaves of tolerant cultivars during seed filling reflects the impact of antioxidant defence system operative at that time. The higher accumulation of proline and total phenol in leaves of tolerant cultivars might be playing important role in drought stress tolerance. These results indicated the importance of upregulation of different antioxidant enzymes at variable stages of leaf development.

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