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1993 (1)
1982 (1)
1Author    Günter Döhler, Jean-Claude Leclerc, M.Requires cookie*
 Title    Photosynthetic Adaptation in Synechococcus Cells  
 Abstract    The cyanobacterium Synechococcus (Anacystis nidulans, strain L 1401-1) grown under different light conditions showed variations in pigmentation. Ratios of photosynthetic pigments and the effect on quantum requirement and oxygen evolution were studied. An increase in the ratio of chlorophyll a forms with absorption maxima in the far red regime to total chlorophyll a forms was observed in cells grown in strong white light. The quantum efficiency of orange light (637 nm) -absorbed by phycocyanin — was higher after growth of Synechococcus in white than 
  Reference    Z. Naturforsch. 37c, 1075—1080 (1982); received August 12 1982 
  Published    1982 
  Keywords    Pigmentation, Quantum Requirement, Absorption Spectra, Oxygen Evolution, P 700, Synecho­ coccus 
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 TEI-XML for    default:Reihe_C/37/ZNC-1982-37c-1075.pdf 
 Identifier    ZNC-1982-37c-1075 
 Volume    37 
2Author    Aloysius Wild, Petra Strobel, Ute FlammersfeldRequires cookie*
 Title    Studies of Components of the Thylakoid Membrane of Undamaged and Damaged Spruce Trees at Different Mountain Sites  
 Abstract    During a five-year period, com ponents o f the thylakoid membrane in needles o f the second generation o f undamaged and damaged trees o f Norway spruce were studied at three different mountain sites in W est Germany. Visible signs o f damage at these sites are a yellowing o f the light-exposed sides o f the needles as well as the loss o f needles. The goal o f this study was to determine damage-induced alterations in com position and physiological reactions o f the thy­ lakoid membranes in spruce needles. In order to meet this purpose, contents o f chlorophyll a and b, electron transport rate o f photosystem II, contents o f the D 1 protein, cytoch rom e/, as well as P-700 were measured. The chlorophyll content in the needles o f the damaged spruce trees was significantly lower than in the needles o f the undamaged trees. In addition to this, the typical annual course o f chlorophyll content was exclusively observed in the needles o f the undamaged spruce trees. If related to dry weight, a drastic reduction o f the electron transport rate and o f the redox com ­ ponents o f the thylakoid membrane was observed due to damage, indicating a degeneration o f the photosynthetic membranes. The contents o f D 1 protein and the photosynthetic electron transport rates were also markedly reduced in the needles o f the damaged trees, when related to chlorophyll content o f thylakoids, suggesting an early and particular impairment o f photo­ system II. The comparison o f spruce trees showing different signs o f damage demonstrates that certain biochemical parameters concerning the photosynthetic membranes (chlorophyll, cytochrom e/ , ratio photosystem II/I) reflect the extent o f damage and are suitable for an early indication o f a beginning, but still invisible damage o f spruce trees. 
  Reference    Z. Naturforsch. 48c, 911 (1993); received June 5/August 27 1993 
  Published    1993 
  Keywords    Chlorophyll, Cytochrome /, D 1 Protein, Forest Decline, P-700, Photosynthetic Electron Transport 
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 TEI-XML for    default:Reihe_C/48/ZNC-1993-48c-0911.pdf 
 Identifier    ZNC-1993-48c-0911 
 Volume    48