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'Stability of Chlorophylls' in keywords
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1981 (1)
1Author    H. K. Lichtenthaler, G. Burkard, G. Kuhn, U. PrenzelRequires cookie*
 Title    Light-Induced Accumulation and Stability of Chlorophylls and Chlorophyll-Proteins during Chloroplast Development in Radish Seedlings  
 Abstract    Illumination of 3 day old etiolated radish seedlings with continuous white light results in a progressive accumulation o f chlorophyll a and b. Both pigments are bound in a different way to the thylakoid chlorophyll-proteins, which appear parallel to the formation of chlorophylls. By applying the SDS-PAGE method to SDS-digested chloroplasts, it was possible to show that the chloroplasts of radish cotyledons contain the typical chlorophyll proteins LHCPi_ 3, CPa, CPI and CPIa which have been found in other plants. Between LHCPj and CPI an additional chlorophyll protein is detected with the spectral properties of a LHCP; it is termed here LHCPy. When the green plants are transferred to continuous darkness, chlorophylls and the chloro-phyll-proteins are progressively degraded. At an early stage of greening chlorophyll b is destroyed at a much higher rate in darkness than chlorophyll a, which yields high chlorophyll a/b ratios. This is paralleled by a faster decrease in the level of the corresponding chloro­ phyll a/b-protein LHCP3 than of CPI. At a later stage of greening, after the end o f the logarithmic chlorophyll accumulation, the chlorophylls a and b and also the LHCP3 and CPI are destroyed in continuous darkness at equal rates; the a/b ratios and the LHCP3/CPI ratios are then little different from the light control. The data indicate that at an early stage o f greening the light-harvesting chlorophyll a/b-protein LHCPj is less stable than the other chlorophyll-proteins (CPI, CPIa, CPa), which contain pre­ dominantly chlorophyll a. The ratio chlorophyll a to /?-carotene (a/c ratio) of CPIa, CPI and CPa is about 10, while that of the LHCPj_ 3 is found to be between 150 to 300. We therefore propose using the a/c ratio to define the chlorophyll-proteins which, besides the absorption spectra, is the most suitable parameter. 
  Reference    Z. Naturforsch. 36c, 421 (1981); received March 17 1981 
  Published    1981 
  Keywords    Chlorophyll a/b ratio, Chlorophyll Degradation, Chlorophyll-Proteins, Chloroplast Development, Stability of Chlorophylls 
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 TEI-XML for    default:Reihe_C/36/ZNC-1981-36c-0421.pdf 
 Identifier    ZNC-1981-36c-0421 
 Volume    36