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1980 (1)
1Author    Eckhard Loos, Ernst KellnerRequires 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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 TEI-XML for    default:Reihe_C/35/ZNC-1980-35c-0298.pdf 
 Identifier    ZNC-1980-35c-0298 
 Volume    35