| | 1 | Author
| Eckhard Loos, Ernst Kellner | Requires cookie* | | | Title
| Influence of Magnesium Ions on the Action of Photosystems I and II at Different Wavelengths Experiments with Barley Chloroplasts of Different Chlorophyll b Content  | | | | Abstract
| Barley leaves grown under a natural light/dark regime have a chlorophyll content o f 1300 [ig/g fresh weight and a chlorophyll a /b ratio of 2 .5 -3 . W hen the plants are grown under cycles of 2 min lig h t/1 18 min dark, the respective values are 50 and 5 — 9. W ith chloroplasts with low chlo rophyll b content variable fluorescence is depressed by about 30% by MgCl2; with those o f high chlorophyll b content a threefold increase is seen instead. Action spectra for variable fluorescence o f chloroplasts o f high chlorophylll b content show enhancement by Mg2+ around 475 and 650 nm; for the system I-mediated methyl viologen reduction, a depression is seen at these wavelengths. These effects are practically absent in chloroplasts with low chlorophyll b content. The data corro borate the hypothesis that a chlorophyll b-containing pigment protein complex is required for re gulation of energy transfer to system I and II by magnesium ions. | | | |
Reference
| Z. Naturforsch. 35c, 298—302 (1980); received October 17 1979/January 23 1980 | | | |
Published
| 1980 | | | |
Keywords
| Chlorophyll b, Barley, Magnesium Ions, Wavelength Action | | | |
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| default:Reihe_C/35/ZNC-1980-35c-0298.pdf | | | | Identifier
| ZNC-1980-35c-0298 | | | | Volume
| 35 | |
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