Response of ascorbate peroxidase isoenzymes and ascorbate regeneration system to abiotic stresses in Cucumis sativus L
Ascorbate peroxidase (APX) isoenzymes, distributing in at least four distinct cell compartments, the chloroplastic stroma (sAPX) and thylakoid membrane (tAPX), microbody (mAPX) and cytosol (cAPX), catalyze the reduction of H(2)O(2) to water by using ascorbic acid (AsA) as specific electron donor. In...
| Veröffentlicht in: | Plant physiology and biochemistry : PPB. - 1991. - 43(2005), 12 vom: 01. Dez., Seite 1082-8 |
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| Weitere Verfasser: | , , , , |
| Format: | Aufsatz |
| Sprache: | English |
| Veröffentlicht: |
2005
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| Zugriff auf das übergeordnete Werk: | Plant physiology and biochemistry : PPB |
| Schlagworte: | Journal Article Research Support, Non-U.S. Gov't Isoenzymes Oxidants Hydrogen Peroxide BBX060AN9V Oxidoreductases EC 1.- Peroxidases EC 1.11.1.- mehr... |
| Zusammenfassung: | Ascorbate peroxidase (APX) isoenzymes, distributing in at least four distinct cell compartments, the chloroplastic stroma (sAPX) and thylakoid membrane (tAPX), microbody (mAPX) and cytosol (cAPX), catalyze the reduction of H(2)O(2) to water by using ascorbic acid (AsA) as specific electron donor. In order to better clarify the response of APX isoenzymes and AsA regeneration enzymes to abiotic stresses, the activities of APX isoenzymes as well as monodehydroascorbate reductase (MDAR), glutathione reductase (GR) and dehydroascorbate reductase (DHAR) were investigated in cucumber plants after heat, methyl viologen (MV) and H(2)O(2) treatments. The activities of cAPX, sAPX, mAPX increased after a slight decline throughout the experiment. Consistent closely with sAPX activity, the expression of sAPX followed a similar change pattern, indicating that sAPX was regulated at the transcriptional level. In contrast, constitutive expression was observed in tAPX activity and no significant changes in tAPX activity were found throughout the experiment. The increases in MDAR and GR were accompanied with enhanced level of AsA/DHA, implying that the AsA regeneration system plays an essential role in compensating AsA degradation |
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| Beschreibung: | Date Completed 31.03.2006 Date Revised 30.09.2020 published: Print-Electronic Citation Status MEDLINE |
| ISSN: | 1873-2690 |