Interactive Effects of Sudden and Gradual Drought Stress and Foliar-applied Glycinebetaine on Growth, Water Relations, Osmolyte Accumulation and Antioxidant Defence System in Two Maize Cultivars Differing in Drought Tolerance

2014 ◽  
Vol 200 (6) ◽  
pp. 425-433 ◽  
Author(s):  
L.-X. Zhang ◽  
J.-H. Lai ◽  
Z.-S. Liang ◽  
M. Ashraf
Keyword(s):  
Drought Stress ◽  
Drought Tolerance ◽  
Water Relations ◽  
Interactive Effects ◽  
Antioxidant Defence ◽  
Defence System ◽  
Maize Cultivars ◽  
Osmolyte Accumulation ◽  
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.

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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