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'Photosystem II' in keywords Facet   section ZfN Section C:Volume 034  [X]
Facet   Publication Year 1979  [X]
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1Author    Govindjee, Paul Mathis, Claudie Vem Otte, Daniel Wong, Satham Saphon, ThomasW. Ydrzynskic, Jean-M Arie BriantaisRequires cookie*
 Title    Cation Effects on System II Reactions in Thylakoids: Measurements on Oxygen Evolution, the Electrochromic Change at 515 Nanometers, the Primary Acceptor and the Primary Donor  
 Abstract    Divalent cations are known to decrease the "spillover" of excitation energy from photosystem II (PS II) to PS I. At low light intensities, this does lead to an increased quantum yield of photo­ reactions in PS II. Contrary to some suggestions that PS II is activated at high light intensities, or in strong flashes of light by the addition of Mg2+, we suggest here that Mg2+ ions may not activate reaction center II, P 680. After brief light flashes, we do not find any significant enhancement in (a) 0 2 yield/flash, (b) proton yield/flash, (c) the amplitude of charge separation in PS II, as moni­ tored by 515 nm absorbance change, and (d) the amplitude of the reduced primary acceptor, as monitored by 320 nm absorbance change. Data on absorbance change at 820 nm suggest that the absence of Mg2+ does not lead to inactivation of electron donation to P 680+. 
  Reference    Z. Naturforsch. 34c, 826—830 (1979); received July 9 1979 
  Published    1979 
  Keywords    Photosynthesis, Flash Yields, Cation Effects, Photosystem II, Thylakoids 
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 TEI-XML for    default:Reihe_C/34/ZNC-1979-34c-0826.pdf 
 Identifier    ZNC-1979-34c-0826 
 Volume    34