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JXB Advance Access published online on May 19, 2006
Journal of Experimental Botany, doi:10.1093/jxb/erl007
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© The Author [2006]. Published by Oxford University Press [on behalf of the Society for Experimental Biology]. All rights reserved. For Permissions, please e-mail: journals.permissions@oxfordjournals.org
Received March 1, 2006
Accepted March 29, 2006

Oxygen Metabolism ROS and Redox Signalling in Plants Special Issue

Senescence- and drought-related changes in peroxidase and superoxide dismutase isoforms in leaves of Ramonda serbica

Sonja Veljovic-Jovanovic 1, Biljana Kukavica 1, Branka Stevanovic 2, and Flavia Navari-Izzo 3 *

1 Center for Multidisciplinary Studies, Belgrade University, Kneza Viseslava 1a, 11030 Belgrade, Serbia and Montenegro
2 Faculty of Biology, Belgrade University, Takovska, 11000 Belgrade, Serbia and Montenegro
3 Dipartimento di Chimica e Biotecnologie Agrarie, Università degli Studi di Pisa, Via del Borghetto, 80, 56124 Pisa, Italy

* To whom correspondence should be addressed.
Flavia Navari-Izzo, E-mail: fnavari{at}agr.unipi.it


  Abstract

Ramonda sp. (Gesneriaceae) is an endemic and relic plant in a very small group of poikilohydric angiosperms that are able to survive in an almost completely dehydrated state. Senescence- and drought-related changes in the activity of peroxidase (POD; EC 1.11.1.7), ascorbate peroxidase (EC 1.11.1.11), and superoxide dismutase (SOD; EC 1.15.1.1) were determined in leaves of different age and relative water content. The results indicate that different POD isoforms were stimulated during senescence and dehydration. Two of the soluble POD isoforms were anionic with pI 4.5, and two were cationic with pI 9.3 and 9.0. The activity of ascorbate peroxidase remained unchanged either by drought or senescence. For the first time, SOD isoforms have now been determined in this resurrection plant. Several SOD isoforms, all of the Mn type, were found to be anionic with pI 4 and a few others had pI from 5 to 6, while one band of FeSOD with a lower molecular weight was neutral. Rehydration brought about a remarkable decrease over the first hour in the activity of all the antioxidant enzymes examined but activity recovered 1 d after rehydration. The results confirmed that dehydration and senescence caused disturbance in the redox homeostasis of Ramonda leaves, while inducing different POD isoforms. A physiological role of peroxidase reaction with hydroxycinnamic acids in conservation and protection of cellular constituents of desiccated Ramonda leaves is suggested.

Keywords: Desiccation; peroxidase; Ramonda; senescence; superoxide dismutase.
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