NDLI: Regulation of stress-induced phospholipid hydroperoxide glutathione peroxidase expression in citrus

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Planta : Volume 209, Issue 3, September 1999

Planta : Volume 209, Issue 2, August 1999

Planta : Volume 209, Issue 1, July 1999

Regulation of stress-induced phospholipid hydroperoxide glutathione peroxidase expression in citrus

Content Provider	Springer Nature Link
Author	Avsian Kretchmer, Orna Eshdat, Yuval Gueta Dahan, Yardena Ben Hayyim, Gozal
Copyright Year	1999
Abstract	Recent findings in our laboratory showed that in citrus cells, salt treatment induced the accumulation of mRNA and a protein corresponding to phospholipid hydroperoxide glutathione peroxidase (PHGPX), an enzyme active in the cellular antioxidant system. The protein and its encoding gene, csa, were isolated and characterized, and the expected enzymatic activity was demonstrated (G. Ben-Hayyim et al., 1993, Plant Sci. 88: 129–140; D. Holland et al., 1993, Plant Mol. Biol. 21: 923–927; D. Holland et al., 1994, FEBS Lett. 337: 52–55; T. Beeor-Tzahar et al., 1995, FEBS Lett. 366: 151–155). In an attempt to find out how salt induces the expression of an antioxidant enzyme, the regulation of PHGPX in citrus cells was studied at both the mRNA transcript and the protein levels. A high and transient response at the csa mRNA level was observed after 4–7 h of exposing salt-sensitive cells to NaCl, or abscisic acid, whereas no response could be detected in the salt-tolerant cells under the same conditions. tert-Butylhydroperoxide, a substrate of PHGPX, induced csa mRNA transcripts after only 2 h, and abolished the differential response between salt-sensitive and salt-tolerant cells. On the basis of these results and those obtained under heat and cold stresses, it is suggested that csa is directly induced by the substrate of its encoded enzyme PHGPX, and that salt induction occurs mainly via the production of reactive oxygen species and hydroperoxides.
Starting Page	469
Ending Page	477
Page Count	9
File Format	PDF
ISSN	00320935
Journal	Planta
Volume Number	209
Issue Number	4
e-ISSN	14322048
Language	English
Publisher	Springer-Verlag
Publisher Date	1999-10-21
Publisher Place	Berlin/Heidelberg
Access Restriction	One Nation One Subscription (ONOS)
Content Type	Text
Resource Type	Article
Subject	Genetics Plant Science

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