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'Electrochromism' in keywords Facet   Publication Year 1979  [X]
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1979[X]
1Author    G. Renger, D. Difiore, B. Luuring, P. GräberRequires cookie*
 Title    The Variation of the Electrochromic Difference Spectrum at Various Stages of the Chloroplast Developm ent+  
 Abstract    The flash-induced difference spectrum in the range of 450 — 550 nm of protochloroplasts isolated from pea-leaves greened under intermittent illumination (2 min light, 98 min dark) was measured and compared with that of fully developed chloroplasts from pea leaves. Because of the sensitivity of the decay o fthe absorption changes to the ionophore valinomycin they were shown to mainly be due to an electrochromic bandshift of the membrane pigments (chlorophylls-a, -b and caro-tenoids). The differences in the shape and the amplitude between both spectra are consistently explained within the framework of a recent hypothesis supposed by Sewe and Reich (Z. Natur-forsch. 33 c, 161 — 171 (1978)) by the lack of chlorophyll-b in the protochloroplasts. It is con­ cluded, that the transformation of the protochloroplasts into chloroplasts which is accompanied by the incorporation of the light harvesting complex and the formation of grana stacks does not seriously change the orientation of the field indicating pigments within the membrane with respect of the polarity of the light induced vectorial electron transport. 
  Reference    Z. Naturforsch. 34c, 120 (1979); received October 23 1978 
  Published    1979 
  Keywords    Chloroplast Development, Electric Field, Electrochromism, Pigment Orientation 
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 TEI-XML for    default:Reihe_C/34/ZNC-1979-34c-0120.pdf 
 Identifier    ZNC-1979-34c-0120 
 Volume    34