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

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)...

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Veröffentlicht in:Journal of experimental botany. - 1985. - 57(2006), 8 vom: 01., Seite 1759-68
1. Verfasser: Veljovic-Jovanovic, Sonja (VerfasserIn)
Weitere Verfasser: Kukavica, Biljana, Stevanovic, Branka, Navari-Izzo, Flavia
Format: Aufsatz
Sprache:English
Veröffentlicht: 2006
Zugriff auf das übergeordnete Werk:Journal of experimental botany
Schlagworte:Journal Article Research Support, Non-U.S. Gov't Isoenzymes Plant Proteins Reactive Oxygen Species Water 059QF0KO0R Peroxidases EC 1.11.1.- Ascorbate Peroxidases mehr... EC 1.11.1.11 Superoxide Dismutase EC 1.15.1.1
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245 1 0 |a Senescence- and drought-related changes in peroxidase and superoxide dismutase isoforms in leaves of Ramonda serbica 
264 1 |c 2006 
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500 |a Date Revised 16.11.2017 
500 |a published: Print-Electronic 
500 |a Citation Status MEDLINE 
520 |a 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 
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650 7 |a Isoenzymes  |2 NLM 
650 7 |a Plant Proteins  |2 NLM 
650 7 |a Reactive Oxygen Species  |2 NLM 
650 7 |a Water  |2 NLM 
650 7 |a 059QF0KO0R  |2 NLM 
650 7 |a Peroxidases  |2 NLM 
650 7 |a EC 1.11.1.-  |2 NLM 
650 7 |a Ascorbate Peroxidases  |2 NLM 
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700 1 |a Kukavica, Biljana  |e verfasserin  |4 aut 
700 1 |a Stevanovic, Branka  |e verfasserin  |4 aut 
700 1 |a Navari-Izzo, Flavia  |e verfasserin  |4 aut 
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