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Biological Trace Element Research

, Volume 143, Issue 3, pp 1758–1776 | Cite as

Selenium Pretreatment Upregulates the Antioxidant Defense and Methylglyoxal Detoxification System and Confers Enhanced Tolerance to Drought Stress in Rapeseed Seedlings

  • Mirza Hasanuzzaman
  • Masayuki FujitaEmail author
Article

Abstract

In order to observe the possible regulatory role of selenium (Se) in relation to the changes in ascorbate (AsA) glutathione (GSH) levels and to the activities of antioxidant and glyoxalase pathway enzymes, rapeseed (Brassica napus) seedlings were grown in Petri dishes. A set of 10-day-old seedlings was pretreated with 25 μM Se (Sodium selenate) for 48 h. Two levels of drought stress (10% and 20% PEG) were imposed separately as well as on Se-pretreated seedlings, which were grown for another 48 h. Drought stress, at any level, caused a significant increase in GSH and glutathione disulfide (GSSG) content; however, the AsA content increased only under mild stress. The activity of ascorbate peroxidase (APX) was not affected by drought stress. The monodehydroascorbate reductase (MDHAR) and glutathione reductase (GR) activity increased only under mild stress (10% PEG). The activity of dehydroascorbate reductase (DHAR), glutathione S-transferase (GST), glutathione peroxidase (GPX), and glyoxalase I (Gly I) activity significantly increased under any level of drought stress, while catalase (CAT) and glyoxalase II (Gly II) activity decreased. A sharp increase in hydrogen peroxide (H2O2) and lipid peroxidation (MDA content) was induced by drought stress. On the other hand, Se-pretreated seedlings exposed to drought stress showed a rise in AsA and GSH content, maintained a high GSH/GSSG ratio, and evidenced increased activities of APX, DHAR, MDHAR, GR, GST, GPX, CAT, Gly I, and Gly II as compared with the drought-stressed plants without Se. These seedlings showed a concomitant decrease in GSSG content, H2O2, and the level of lipid peroxidation. The results indicate that the exogenous application of Se increased the tolerance of the plants to drought-induced oxidative damage by enhancing their antioxidant defense and methylglyoxal detoxification systems.

Keywords

Drought stress tolerance PEG-6000 Glyoxalase Oxidative stress ROS Selenium 

Abbreviations

AO

Ascorbate oxidase

APX

Ascorbate peroxidase

AsA

Ascorbic acid

CAT

Catalase

CDNB

1-Chloro-2,4-dinitrobenzene

DHA

Dehydroascorbate

DHAR

Dehydroascorbate reductase

DTNB

5,5′-Dithio-bis (2-nitrobenzoic acid)

EDTA

Ethylenediaminetetraacetic acid

Gly I

Glyoxalase I

Gly II

Glyoxalase II

GR

Glutathione reductase

GSH

Reduced glutathione

GSSG

Oxidized glutathione

GPX

Glutathione peroxidase

GST

Glutathione S-transferase

MDA

Malondialdehyde

MDHA

Monodehydroascorbate

MDHAR

Monodehydroascorbate reductase

MG

Methylglyoxal

NADPH

Nicotinamide adenine dinucleotide phosphate

NTB

2-Nitro-5-thiobenzoic acid

PEG

Polyethylene glycol

ROS

Reactive oxygen species

Se

Selenium

SLG

S-d-lactoylglutathione

TBA

Thiobarbituric acid

TCA

Trichloroacetic acid

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Copyright information

© Springer Science+Business Media, LLC 2011

Authors and Affiliations

  1. 1.Laboratory of Plant Stress Responses, Department of Applied Biological Science, Faculty of AgricultureKagawa UniversityKita-gunJapan
  2. 2.Department of Agronomy, Faculty of AgricultureSher-e-Bangla Agricultural UniversityDhakaBangladesh

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