scholarly journals Sodium silicate mediated response of antioxidative defense system in Lycopersicon esculentum mill. under water stress

2017 ◽  
Vol 9 (2) ◽  
Author(s):  
Chanchal Malhotra ◽  
Riti Thapar Kapoor ◽  
Deepak Ganjewala ◽  
NB Singh
Keyword(s):  
Antioxidant Enzymes ◽  
Water Stress ◽  
Lycopersicon Esculentum ◽  
Water Deficit ◽  
Sodium Silicate ◽  
Antioxidative Defense ◽  
Defense System ◽  
Tomato Plants ◽  
Antioxidative Defense System ◽  
Water Stress Condition

<p dir="ltr"><span>The present study was designed to study the effect of water stress on </span><span>Lycopersicon esculentum</span><span> Mill. and role of sodium silicate in the protection of tomato plants under water deficit condition.</span></p><p dir="ltr"><span>Different biochemical parameters such as photosynthetic pigments, protein, sugar, MDA content, proline, nitrate reductase activity and activities of antioxidant enzymes (SOD, CAT, APX and POX) were examined in tomato leaves at 40 and 60 DAS by the standard methods. The lycopene and β-carotene contents</span><span>in tomato fruits were also analyzed at 60, 65 and 70 DAS.</span></p><p dir="ltr"><span>Water stress significantly decreased relative water content (RWC), pigment content, sugar and protein contents in tomato leaves at 60 DAS but the accumulation of proline was stimulated in tomato leaves under water deficit condition. The activities of antioxidant enzymes such as SOD, CAT, APX and POX were significantly increased under (3d and 6d) water stress condition at 60 DAS.</span></p><span id="docs-internal-guid-05eb48fe-e950-ee27-fc39-fe0ccdaffeb9"><span>This study offers first hand information on the water stress-induced oxidative stress in </span><span>Lycopersicon esculentum</span><span>and development of antioxidative defense system against drought.</span><span>The results obtained clearly indicated the positive impact of sodium silicate in protection of tomato plants under water deficit condition.</span></span>

scholarly journals Nitrogen Metabolism and Antioxidant System in Young Plants of Parkia pendula Submitted to Drought

2018 ◽  
Vol 11 (1) ◽  
pp. 459
Author(s):  
Oliveira B. Tamires ◽  
Karollyne R. S. Silva ◽  
Dielle T. F. Teixeira ◽  
Milena P. Moraes ◽  
Glauco A. S. Nogueira ◽  
...  
Keyword(s):  
Antioxidant Enzymes ◽  
Water Stress ◽  
Plant Defense ◽  
Nitrogen Metabolism ◽  
Lower Amount ◽  
Defense System ◽  
Water Restriction ◽  
Water Stress Condition ◽  
The Family ◽  
Set Up

The (Parkia pendula (Willd.) Benth. ex Walp.) species most know as visgueiro is a native specie from the Amazon region, belongs to the family Fabaceae-mimosoideae and has been scientifically studied because it is used in landscape projects and the restoration of degraded areas. Intrinsic responses of this species due to water stress is still very superficial, lacking a larger scientific approach in nitrogen and oxidative parameters. For this, a greenhouse experiment was set up in the Federal Rural University of Amazon with seedlings, where they were submitted to water restriction. The experimental design was completely randomized in a 2 &times; 3 factorial design (control and water deficit, and three evaluation times), with 5 replications, totaling 30 experimental units. The results showed that the RWC reduced during the experiment from 73.5% to 52.99%, evidencing a lower amount of water in these plants. This condition caused the plants to respond positively to the increase of antioxidant enzymes (catalase, APX and SOD), making the plant defense system efficient. As well as for some variables of nitrogen metabolism. The results showed that the RWC reduced during the experiment from 73.5% to 52.99%, evidencing a lower amount of water in these plants. This condition caused the plants to respond positively to the increase of antioxidant enzymes (catalase, APX and SOD), making the plant defense system efficient. As well as for some variables of nitrogen metabolism. The species in this experimental condition was considered as sensitive to the water stress condition.

scholarly journals Growth Hormone-like Activities of Organophosphorus Flame Retardants (OPFRs) in growth of Rice (Oryza sativa L.)

2021 ◽  
Author(s):  
Qian Bai ◽  
Haiou Wang ◽  
Wenxiao Zhang ◽  
Bokai Jiang ◽  
Yuqing Ma ◽  
...  
Keyword(s):  
Antioxidant Enzymes ◽  
Flame Retardants ◽  
Oryza Sativa L ◽  
Antioxidative Defense ◽  
Defense System ◽  
Gene Expressions ◽  
Antioxidative Defense System ◽  
Organophosphorus Flame Retardants ◽  
Growth Of Seedlings ◽  
Detoxification Process

Abstract To identify the toxic effect of Organophosphorus Flame Retardants (OPFRs) on plants, six different OPFRs involved in three concentrations (50 µg/L, 100 µg/L and 200 µg/L) were selected to estimate their toxicity to rice growth. The seed germination, seedling growth, OPFRs accumulation and antioxidative defense system were investigated in rice. The results showed that all of OPFRs inhibited the germination of seeds. OPFRs were accumulated in roots and shoots, and the accumulations of OPFRs in roots were higher than in shoots. However, the hormone-like effect of all six OPFRs was found on plants. The growth of seedlings was irrigated by 50 µg/L, 100 µg/L and 200 µg/L OPFRs in our experiment according to fresh weights and lengths of seedlings. And then malondialdehyde (MDA) and antioxidative defense system were impressed after OPFRs exposed 21 d. According to gene expressions of seven antioxidative enzymes at 14 d, most of enzyme expressions were updated to alleviated reactive oxygen species (ROS) by OPFRs exposure. Tris (1, 3-dichloro-2-propyl) phosphate (TDCPP) showed the strongest oxidative toxicity to plants among all of OPFRs. During the early 14 d period, the antioxidant enzymes could play important role in detoxification process. And after 21 d, antioxidants ascorbate (AsA) in roots and glutathione (GSH) in shoots could take over antioxidant enzymes against to OPFRs toxicity.

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