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Exogenous melatonin affects photosynthesis in characeae Chara australis
D. Lazár, SJ. Murch, MJ. Beilby, S. Al Khazaaly,
Language English Country United States
Document type Journal Article, Research Support, Non-U.S. Gov't
NLK
Free Medical Journals
from 2006 to 1 year ago
PubMed Central
from 2006
Europe PubMed Central
from 2006 to 1 year ago
Medline Complete (EBSCOhost)
from 2011-01-01 to 2015-06-30
PubMed
23299331
DOI
10.4161/psb.23279
Knihovny.cz E-resources
- MeSH
- Antioxidants metabolism pharmacology MeSH
- Chara drug effects metabolism MeSH
- Characeae MeSH
- Chlorophyll metabolism MeSH
- Chloroplasts MeSH
- Photosynthesis * drug effects MeSH
- Photosystem II Protein Complex metabolism MeSH
- Melatonin metabolism pharmacology MeSH
- Reactive Oxygen Species metabolism MeSH
- Light-Harvesting Protein Complexes metabolism MeSH
- Electron Transport * drug effects MeSH
- Publication type
- Journal Article MeSH
- Research Support, Non-U.S. Gov't MeSH
Melatonin was found in the fresh water characeae Chara australis. The concentrations (~4 μg/g of tissue) were similar in photosynthesizing cells, independent of their position on the plant and rhizoids (roots) without chloroplasts. Exogenous melatonin, added at 10 μM to the artificial pond water, increased quantum yield of photochemistry of photosystem II by 34%. The increased efficiency appears to be due to the amount of open reaction centers of photosystem II, rather than increased efficiency of each reaction center. More open reaction centers reflect better functionality of all photosynthetic transport chain constituents. We suggest that melatonin protection against reactive oxygen species covers not only chlorophyll, but also photosynthetic proteins in general.
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