Ultra-structural and functional changes in the chloroplasts of detached barley leaves senescing under dark and light conditions
Changes in the chloroplast ultra-structure and photochemical function were studied in detached barley (Hordeum vulgare L. cv. Akcent) leaf segments senescing in darkness or in continuous white light of moderate intensity (90 mumol m-2 s-1) for 5 days. A rate of senescence-induced chlorophyll degrada...
| Veröffentlicht in: | Journal of plant physiology. - 1979. - 160(2003), 9 vom: 01. Sept., Seite 1051-8 |
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| 1. Verfasser: | |
| Weitere Verfasser: | , , , , |
| Format: | Aufsatz |
| Sprache: | English |
| Veröffentlicht: |
2003
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| Zugriff auf das übergeordnete Werk: | Journal of plant physiology |
| Schlagworte: | Journal Article Research Support, Non-U.S. Gov't Photosystem II Protein Complex Chlorophyll 1406-65-1 chlorophyll b 5712ZB110R Chlorophyll A YF5Q9EJC8Y |
| Zusammenfassung: | Changes in the chloroplast ultra-structure and photochemical function were studied in detached barley (Hordeum vulgare L. cv. Akcent) leaf segments senescing in darkness or in continuous white light of moderate intensity (90 mumol m-2 s-1) for 5 days. A rate of senescence-induced chlorophyll degradation was similar in the dark- and light-senescing segments. The Chl a/b ratio was almost unchanged in the dark-senescing segments, whereas in the light-senescing segments an increase in this ratio was observed indicating a preferential degradation of light-harvesting complexes of photosystem II. A higher level of thylakoid disorganisation (especially of granal membranes) and a very high lipid peroxidation were observed in the light-senescing segments. In spite of these findings, both the maximal and actual photochemical quantum yields of the photosystem II were highly maintained in comparison with the dark-senescing segments |
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| Beschreibung: | Date Completed 09.02.2004 Date Revised 16.03.2022 published: Print Citation Status MEDLINE |
| ISSN: | 1618-1328 |