Plant Cell Reports

, Volume 25, Issue 9, pp 997–1005

Characterization of two Arabidopsis thaliana glutathione S-transferases

  • Eliana Nutricati
  • Antonio Miceli
  • Federica Blando
  • Luigi De Bellis
Biotic and Abiotic Stress

Abstract

Glutathione S-transferases (GST) are multifunctional proteins encoded by a large gene family, divided on the basis of sequence identity into phi, tau, theta, zeta and lambda classes. The phi and tau classes are present only in plants. GSTs appear to be ubiquitous in plants and are involved in herbicide detoxification and stress response, but little is known about the precise role of GSTs in normal plant physiology and during biotic and abiotic stress response. Two cDNAs representing the two plant classes tau and phi, AtGSTF9 and AtGSTU26, were expressed in vitro and the corresponding proteins were analysed. Both GSTs were able to catalyse a glutathione conjugation to 1-chloro-2,4-dinitrobenzene (CDNB), but they were inactive as transferases towards p-nitrobenzylchloride (pNBC). AtGSTF9 showed activity towards benzyl isothiocyanate (BITC) and an activity as glutathione peroxidase with cumene hydroperoxide (CumHPO). AtGSTU26 was not active as glutathione peroxidase and towards BITC. RT-PCR analysis was used to evaluate the expression of the two genes in response to treatment with herbicides and safeners, chemicals, low and high temperature. Our results reveal that AtGSTU26 is induced by the chloroacetanilide herbicides alachlor and metolachlor and the safener benoxacor, and after exposure to low temperatures. In contrast, AtGSTF9 seems not to be influenced by the treatments employed.

Keywords

Arabidopsis thaliana Glutathione S-transferase Stress 

Abbreviations

AGI

Arabidopsis Genome Initiative

BITC

Benzyl isothiocyanate

CDNB

1-Chloro-2,4-dinitrobenzene

CumHPO

Cumene hydroperoxide

DTT

Dithiothreitol

GSH

Glutathione

GST

Glutathione S-transferase

MJ

Methyl jasmonic acid

PCIB

2-(p-Chlorophenoxy)-2-methylpropionic acid

pNBC

p-Nitrobenzylchloride

RT-PCR

Reverse transcript polymerase chain reaction

RTS

Rapid Translation System

SA

Salicylic acid

SAR

Systemic acquired resistance

SDS-PAGE

Sodium dodecyl sulphate polyacrylamide gel electrophoresis

2,4,6-T

2,4,6-Trichlorophenol

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Copyright information

© Springer-Verlag 2006

Authors and Affiliations

  • Eliana Nutricati
    • 1
  • Antonio Miceli
    • 1
  • Federica Blando
    • 2
  • Luigi De Bellis
    • 1
  1. 1.Dipartimento di Scienze e Tecnologie Biologiche ed AmbientaliUniversità degli Studi di LecceLecceItaly
  2. 2.Istituto di Scienze delle Produzioni AlimentariCNRLecceItaly

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