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Enhancement of antioxidant enzyme activities and primary photochemical reactions in response to foliar application of thiols in water - stressed pearl millet

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Title Enhancement of antioxidant enzyme activities and primary photochemical reactions in response to foliar application of thiols in water - stressed pearl millet
Not Available
 
Creator S.F. D’ Souza
N.S. Nathawat
J.S. Nair
P. Radha Krishna
N.K. Ramaswamy
G. Singh
M.P. Sahu
 
Subject antioxidant enzymes, foliar spray, photochemistry, sulphydryl compounds, thiols
 
Description Not Available
Primary photochemical reactions and the activities of the antioxidant enzymes chloroplastic superoxide dismutase (SOD), glutathione reductase (GR) and glutathione-Stransferase (GST) were determined in water-stressed pearl millet (Pennisetum glaucum L. cv. HHB-67) plants sprayed with the thiol compounds dithiothreitol (DTT), thioglycollic acid (TGA) and thiourea (TU) and the thiol modifiers 5,5’-dithio-bis-2-nitrobenzoic acid (DTNB) and N-ethylmaleimide (NEM) at the earhead emergence stage (47 days after sowing, DAS), together with a control. Sampling was done at 54 and 67 days after sowing. Photosystem I and II (PS I and II) activities (ferricyanide site) were found to increase in plants sprayed with TU, TGA and DTT at both stages (54 and 67 DAS), but a reduction in PS II activity (DCQ Site) compared with the control was caused by NEM (66.66%) and DTNB (27.77%) at 54 DAS. A similar decrease in the activity of PS II (ferricyanide site) was found at 67 DAS for DTNB (55.55%). The chloroplastic SOD activity increased in chloroplasts isolated from leaves sprayed with thiol compounds at both sampling stages, except for NEM at 54 and 67 DAS. The activities of GR and GST in the leaves were higher in thiol-treated plants than in the control at 54 and 67 DAS, while the lowest GR activity was seen for the sulphydryl modifiers (DTNB and NEM) in leaves at 54 DAS. The experimental data suggest an enhancement in the primary photochemistry and antioxidant enzyme activities of water-stressed pearl millet in response to foliar spraying with thiol compounds.
Not Available
 
Date 2019-05-13T11:53:08Z
2019-05-13T11:53:08Z
2009-01-01
 
Type Research Paper
 
Identifier Not Available
Print ISSN 0238-0161 Online ISSN 1588-2527
http://krishi.icar.gov.in/jspui/handle/123456789/19430
 
Language English
 
Relation Not Available;
 
Publisher Akadémiai Kiadó