Veena Sawhney

Chaudhary Charan Singh Haryana Agricultural University

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D. J. D. Nicholas

Hunter Water

S.K. Sawhney

Chaudhary Charan Singh Haryana Agricultural University

Randhir Singh

Central University of Punjab

Sunita Sheokand

Chaudhary Charan Singh Haryana Agricultural University

Amarjit

Agricultural & Applied Economics Association

Neeru Munjal

Chaudhary Charan Singh Haryana Agricultural University

Randhir Singh

Guru Angad Dev Veterinary and Animal Sciences University

Anita Kumari

Chaudhary Charan Singh Haryana Agricultural University

Shiwani Mandhania

Chaudhary Charan Singh Haryana Agricultural University

I. S. Sheoran

University of Toronto

Cooperative Institutions

Chaudhary Charan Singh Haryana Agricultural University

Institute of Himalayan Bioresource Technology

Academy of Scientific and Innovative Research

Sugarcane Breeding Institute

Institut des Sciences des Plantes de Montpellier

University of Adelaide

Agricultural Institute

Guru Nanak Dev University

Central University of Punjab

Indian Institute of Wheat and Barley Research

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Antioxidant defense mechanism under salt stress in wheat seedlings

Biologia Plantarum (2006)

Shiwani Mandhania S. Madan Veena Sawhney

The present study was carried out to study the effect of salt stress on cell membrane damage, ion content and antioxidant enzymes in wheat (Triticum aestivum) seedlings of two cultivars salt-tolerant KRL-19 and salt-sensitive WH-542. Seedlings (4-d-old) were irrigated with 0, 50 and 100 mM NaCl. Observations were recorded on the 3rd and 6th day after salt treatment and 2nd day after salt removal. The relative water content declined with induction of salt stress, more in WH-542 than in cv. KRL-19. K+/Na+ ratio in KRL-19 was higher than in WH-542. WH-542 suffered greater damage to cellular membranes due to lipid peroxidation as indicated by higher accumulation of H2O2, MDA and greater leakage of electrolytes than KRL-19. The activities of catalase, peroxidase and ascorbate peroxidase and glutathione reductase increased with increase in salt stress in both the cultivars, however, superoxide dismutase activity declined. Upon desalanization, partial recovery in the activities of these enzymes was observed in KRL-19 and very slow recovery in WH-542.

Glutathione reductase

10.1007/s10535-006-0011-7

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Citations (258)

Endosperm—Its Morphology, infrastructure, and Histochemistry

International review of cytology (1981)

S. P. Bhatnagar Veena Sawhney

Morphology

10.1016/s0074-7696(08)61286-3

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Citations (34)

Sulphite- and NADH-dependent Nitrate Reductase from Thiobacillus denitrificans

Journal of General Microbiology (1977)

Veena Sawhney D. J. D. Nicholas

SUMMARY: A membrane-bound nitrate reductase from Thiobacillus denitrificans can utilize either sulphite or NADH as an electron donor. The sulphite-dependent nitrate reductase activity was released from the membrane by treatment with sodium deoxycholate. Cytochrome c and FAD were separated from the solubilized enzyme by heat treatment and subsequent chromatography on DEAE-cellulose. The bacterial cytochrome c and a preparation of horse-heart cytochrome c served as electron mediators to the solubilized sulphite-dependent nitrate reductase activity with apparent K m values of 1·5 and 1·3 μ m respectively. The NADH-linked enzymic activity, which was unstable during storage, was re-activated with reduced glutathione. It was also inactivated after treatment with deoxycholate but this effect was reversed by menadione. A possible scheme for electron transport for the sulphite- and NADH-dependent enzyme is proposed.

Menadione

Thiobacillus

10.1099/00221287-100-1-49

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Citations (17)

Effect of chemical desiccation at the post-anthesis stage on some physiological and biochemical changes in the flag leaf of contrasting wheat genotypes

Field Crops Research (2002)

Veena Sawhney Dharam Singh

Anthesis

10.1016/s0378-4290(01)00192-7

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Citations (71)

Nitrogen fixation, photosynthesis and enzymes of ammonia assimilation and ureide biogenesis in nodules of mungbean (Vigna radiata) grown in presence of cadmium.

Indian Journal of Experimental Biology (1990)

Veena Sawhney I. S. Sheoran Randhir Singh

Radiata

Nitrogen Assimilation

Assimilation (phonology)

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Citations (23)

Regulation of NADH-linked nitrate reductase by NAD⁺and 5â²-AMP inThibacillus denitrificans

FEMS Microbiology Letters (1978)

Veena Sawhney D. J. D. Nicholas

Paracoccus denitrificans

10.1111/j.1574-6968.1978.tb01921.x

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Sulphide-linked Nitrite Reductase from Thiobacillus denitrificans with Cytochrome Oxidase Activity: Purification and Properties

Journal of General Microbiology (1978)

Veena Sawhney D. J. D. Nicholas

A membrane-bound, sulphide-linked nitrite reductase from Thiobacillus denitrificans was solubilized and after further purification its properties were examined. The purified enzyme, mol. wt 120 000, contained cytochromes c and d in the ratio of 1:1. Both cytochromes were reduced by sulphide and re-oxidized with nitrite or air. Oxidation by nitrite resulted in the appearance of an absorption peak at 572 nm. The kinetics of the reduction of the enzyme with sulphide indicated that cytochrome c was reduced before cytochrome d. The redox potential of cytochrome d was 22 mV more positive than that of cytochrome c. Cytochromes c and d were dissociated from the purified enzyme by treatment with sodium dodecyl sulphate. The purified nitrite reductase also had cytochrome oxidase activity and both the activities were stimulated by cytochrome c-551 isolated from T. denitrificans. Reduced cytochrome c-551 was an effective electron donor for the purified enzyme with either nitrite or air as the terminal electron acceptor. Neither cytochrome c-554 (also isolated from T. denitrificans) nor mammalian cytochrome c was effective as reductant for the enzyme. NO and N2O were identified as the products of nitrite reduction by the purified sulphide-linked nitrite reductase.

Paracoccus denitrificans

Thiobacillus

10.1099/00221287-106-1-119

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Citations (53)

Effect of applied nitrate on growth and N2-fixation inCicer arietinum L.

Plant and Soil (1985)

Veena Sawhney Amarjit Randhir Singh

Plant Physiology

10.1007/bf02182898

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Citations (14)

Ameliorative effect of exogenous nitric oxide on oxidative metabolism in NaCl treated chickpea plants

Brazilian Journal of Plant Physiology (2010)

Sunita Sheokand Vinita Bhankar Veena Sawhney

Accumulation of salts in irrigated soils is one of the primary factors limiting yield in South Asia. We investigated whether exogenous nitric oxide (NO) supplementation as sodium nitroprusside has any ameliorating effect against NaCl induced oxidative damage in chickpea leaves. NaCl treatment (250 mM) alone and in combination with two concentrations of SNP (0.2 and 1 mM) were given to 50 days old chickpea plants for 2, 4 and 6 days. Salt stress adversely affected the relative membrane injury, lipid peroxidation levels, relative water content (RWC) and H2O2 content. The effect was time dependent. SNP treatments could ameliorate the toxic effect of short term salt stress of 2 days on relative membrane injury and partial amelioration was observed with 4 and 6 day stress treatment. A partial ameliorative effect of SNP was observed with lipid peroxidation levels, H2O2 content and RWC. Salt stress activated the antioxidant system by increasing the activities of SOD, POX, APX and DHAR. However no obvious change was observed in GR activity and CAT activity decreased under salt stress. Both the SNP treatments had a positive effect on antioxidant enzymes SOD, CAT, APX, GR and DHAR under salt stress. NaCl treatment resulted in a decline in the GSH/GSSG and ASC/DHA ratio. SNP treatments increased the reduced form of both the metabolites thus elevating the ratio of GSH/GSSG and ASC/DHA. This study concludes that exogenous application of NO protects chickpea leaves from NaCl induced oxidative stress.

APX

Sodium nitroprusside

10.1590/s1677-04202010000200002

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Citations (71)

Effect of nitric oxide and putrescine on antioxidative responses under NaCl stress in chickpea plants

Physiology and Molecular Biology of Plants (2008)

Sunita Sheokand Anita Kumari Veena Sawhney

APX

Glutathione reductase

Sodium nitroprusside

10.1007/s12298-008-0034-y

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Citations (102)