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1993 (1)
1991 (1)
1Author    F. López-FigueroaRequires cookie*
 Title    Control by Light Quality of Chlorophyll Synthesis in the Brown Alga Desmarestia aculeata  
 Abstract    The chlorophyll synthesis in the brown algae D esm arestia aculeata is affected by light quali­ ty and by the nutrient state in the medium before the illumination. Pulses of 5 min of red, green and blue light together with 200 |iM nitrate in plants growing under natural conditions deter­ mined similar induction of chlorophyll synthesis. However, when the plants were incubated previously under starvation conditions the light effect was different. The induction of chloro­ phyll synthesis was greater after blue and green light than after red light pulses. Red-light pho­ toreceptor was only involved in the chlorophyll synthesis under no nutrient limitations and under starvation conditions after previous illumination with blue light followed by far-red light. The induction of chlorophyll synthesis by green and blue light pulses applied together with nitrate was greater when the algae were incubated in starvation conditions than in natural conditions (normal nutrient state). Because all light effects were partially reversed by far-red light the involvement of a phyto-chrome-like photoreceptor is proposed. In addition, a coaction between blue-and a green-light photoreceptors and phytochrome is suggested. 
  Reference    Z. Naturforsch. 46c, 542—548 (1991); received February 13 1991 
  Published    1991 
  Keywords    Blue-Light Photoreceptor, Chlorophyll Synthesis, D esm arestia aculeata, Green-Light Photo­ receptor, Nitrate 
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 TEI-XML for    default:Reihe_C/46/ZNC-1991-46c-0542.pdf 
 Identifier    ZNC-1991-46c-0542 
 Volume    46 
2Author    F. L. FigueroaRequires cookie*
 Title    Photoregulation of Nitrogen Metabolism and Protein Accumulation in the Red Alga Corallina elongata Ellis et Soland  
 Abstract    Reductase Red and blue light pulses of 5 min applied together with 45 (aM K N 0 3 stimulated the nitrate uptake and reduction and the assimilation of ammonium in darkness in the red alga Corallina elongata. N itrate reductase and glutamine synthetase activities were increased in darkness after the application of both red and blue light pulses. Red light produced a dram atic increase in enzyme activities after the first hour in darkness but after 4 h the effect of blue light pulses was greater. The photostim ulation of nitrogen metabolism was correlated with light-regulated accumulation of soluble proteins. Nitrogen incorporation, assimilation of am monium, accu­ m ulation of total proteins and the increment in total intracellular nitrogen was greater in N-limited algae (C :N = 17.3) than in N-sufficient algae (C :N = 10.3) after the application of light pulses and nitrate. Because the stimulant effects o f red and blue light on N-metabolism were partially reversed by far-red light, the possible involvement o f the photoreversible red/ far-red photoreceptor, phytochrom e, is proposed. In addition, the blue-light effect seems to be mediated by a specific B-light photoreceptor besides phytochrome due to the different time course of the response and the extent of the stimulation after blue compared to red light pulses. 
  Reference    Z. Naturforsch. 48c, 788—794 (1993); received June 15/ 
  Published    1993 
  Keywords    Blue-Light Photoreceptor, Corallina elongata, Glutamine Synthetase, Light Quality, N itrate 
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 TEI-XML for    default:Reihe_C/48/ZNC-1993-48c-0788.pdf 
 Identifier    ZNC-1993-48c-0788 
 Volume    48