Go toArchive
Browse byFacets
Bookbag ( 0 )
'Carotenoids' in keywords Facet   Publication Year 1982  [X]
Results  5 Items
Sorted by   
Section
Publication Year
1982[X]
1Author    Franz-C Czygan, Almuth KrügerRequires cookie*
 Title    Actinioerythrin in M ullus barbatus L  
 Abstract    Actinioerythrin has been isolated together with asta-xanthin-esters and /?-carotene from different samples of Mullus barbatus for the first time. 
  Reference    Z. Naturforsch. 37c, 340—341 (1982); eingegangen am 23. November 1981 
  Published    1982 
  Keywords    Mullus barbatus, Carotenoids, Actinioerythrin, Astaxanthin 
  Similar Items    Find
 DEBUG INFO      
 TEI-XML for    default:Reihe_C/37/ZNC-1982-37c-0340_n.pdf 
 Identifier    ZNC-1982-37c-0340_n 
 Volume    37 
2Author    Hartm Ut KayserRequires cookie*
 Title    Carotenoid Biogenesis in the Stick Insect, Carausius morosus, during a Larval Instar  
 Abstract    [14C]/?-Carotene was fed to juvenile stick insects, Carausius morosus, o f the fifth instar. Radio­ activity was incorporated into 2-hydroxy-, 2-oxo-, and 3,4-didehydro-2-oxo-carotenoids o f the ß,ß-type. These transformations are due to the insect's own capacity; any contribution by microbial symbionts can be ruled out. A study on the labelling kinetics clearly shows that the biogenesis of hydroxy-and oxo-carotenoids is correlated to a decrease in the carotene precursor, but only up to mid instar. Thereafter, oxidation o f the carotene is very low but the transformations of its metabolites continue as before. Predominantly ß,^-carotene-2,2'-diol is dehydrogenated to 3,4,3',4'-tetradehydro-/?,/?-carotene-2,2'-dione via two hydroxyketones. This discontinuous utilization o f /7-carotene could be due to a stop at mid instar either in the oxidation or in the absorption in the gut o f this precursor. 
  Reference    Z. Naturforsch. 37c, 13 (1982); received September 11/October 281981 
  Published    1982 
  Keywords    Carotenoids, Metabolism, [14C]/?-Carotene, Insects, Carausius morosus 
  Similar Items    Find
 DEBUG INFO      
 TEI-XML for    default:Reihe_C/37/ZNC-1982-37c-0013.pdf 
 Identifier    ZNC-1982-37c-0013 
 Volume    37 
3Author    K.H G RuRequires cookie*
 Title    Herbicides which Inhibit Electron Transport or Produce Chlorosis and Their Effect on Chloroplast Development in Radish Seedlings. III. Plastid Pigment and Quinone Composition  
 Abstract    The effect o f DC M U , bentazon, amitrole and SA N 6706 on the form ation o f chloroplast pig­ ments and quinones was investigated using plants that were grown in total darkness or continuous white, red or far-red light. All herbicides assayed affected the formation o f chlorophylls, carotenoids and quinones but DC M U had only minor effects. Like for chlorophylls and carotenoids the form ation o f quinones was most suppressed in plants grown in the presence o f the herbicide in continuous white or red light, but the effect on the formation o f quinones was much lower as com pared to the pigments. The observation that the biosynthesis o f quinones is still m aintained in SA N 6706 treated bleach­ ed plastids which are lacking chlorophylls and carotenoids indicates that quinones are synthesized at the plastitd envelope and stored in the osm iophilic plastoglobuli. Amitrole and SA N 6706 induced a strong chlorosis. It was o f particular interest that chlorosis was also induced by the photosystem II inhibitor bentazon. D C M U was not effective. The inhibi­ tor concentration for 50% inhibition in the chlorophyll and carotenoid content was 5 x l 0 ~6 M for SAN 6706,3 x 10-4 M for am itrole and 10~3 M for bentazon. As already reported by others SA N 6706 treated plants accum ulated phytoene in large amounts. The highest phytoene content was observed in plants that were grown in the dark. A m itrole treat­ ed plants accumulated lycopene. But in addition other carotenoid precursors like phytoene and phjHofluene were also accum ulated. In contrast to phytoene lycopene was only accum ulated in plants that were grown in the light. Particularly for SA N 6706 and amitrole the expression o f the bleaching effect was depending on the light intensity and light quality that was used during plant growth. T he herbicide effect ewas predominantly expressed at higher light intensities and after irradiation with red light. The o b ­ servation that the induction o f chlorosis is very sensitive to red light as com pared to w hite or blue light is suggesting that phytochrom e is involved in the developm ent o f the herbicide toxicity. It also supports that in SA N treated plants chlorophylls are photodecom posed directly by light be­ cause o f the lack o f photoprotecting carotenoids but m ainly /?-carotene in these plastids. Further support for this was given by the demonstration that SA N treated plants w hich were grown at very low light intensities turned green and were photosynthetically active. 
  Reference    Z. Naturforsch. 37c, 642 (1982); received April 5 1982 
  Published    1982 
  Keywords    Bleaching Herbicides, Carotenoids, Chlorophylls, Lycopene, Photosystem II H erbicides 
  Similar Items    Find
 DEBUG INFO      
 TEI-XML for    default:Reihe_C/37/ZNC-1982-37c-0642.pdf 
 Identifier    ZNC-1982-37c-0642 
 Volume    37 
4Author    Jürgen Feierabend, TheresiaW. Inkelhüsener, Petra Kemmerich, Ulrike SchulzRequires cookie*
 Title    Mechanism of Bleaching in Leaves Treated with Chlorosis-Inducing Herbicides  
 Abstract    Bleaching o f chlorophyll was studied in the leaves of rye seedlings (Secale cereale L.) treated with four chlorosis-inducing herbicides of different potency (weak photodestructions, group 1: aminotriazole, haloxidine; strong photodestructions, group 2: San 6706, difunone). Chlorophyll deficiency and particularly the inactivation of a chloroplast marker enzyme, NADP-dependent glyceraldehyde-3-P dehydrogenase, that occurred in the presence o f group 2 herbicides were stronger in red, than in blue, light. When grown in white light o f low intensity (10 lx) herbicide-treated leaves contained chloro­ phyll, 70 S ribosomes and unimpaired activities o f NADP-dependent glyceraldehyde-3-P de­ hydrogenase. At 10 lx only the leaves treated with SAN 6706 and difunone were strongly carotenoid-deficient but not those treated with group 1 herbicides. After all herbicide treatments 10 lx-grown leaf tissue was, however, not capable o f photosynthetic 0 2-evolution indicating some disorder of photosynthetic electron transport. Leaf segments grown at 10 lx were exposed to a high light intensity o f 30000 lx at either 0 ° C or 30 °C. In treatments with group 1 herbicides chlorophyll accumulation was stopped in bright light at 30 °C but breakdown was not apparent. Only at 0 °C and in the presence of high, growth-reducing, herbicide concentrations chlorophyll was slightly degraded. The RNAs o f the 70S ribosomes were, however, clearly destroyed at 30000 lx and 30 °C in aminotriazole-treated leaves. In leaves treated with group 2 herbicides chlorophyll was rapidly degraded at 30000 lx both at 0 ° C and 30 °C, however, only in the presence of 0 2, indicating a true photooxidative and mainly photochemical nature o f the reactions involved. This chlorophyll breakdown was accompanied by the photodestruction of 70S ribosomes and the inactivation of NADP-glyceraldehyde-3-P dehydrogenase. In treatments with group 1 herbicides photoinactivation o f the latter enzyme did not occur, although it was clearly localized in the bleached plastids, as demonstrated by gradient separation o f organelles. In the presence of group 2 herbicides the chlorosis was originating from a direct photo­ oxidation of chlorophyll, accompanied by a massive destruction o f other plastid constituents and functions. In treatments with group 1 herbicides photodestructions appeared to be much weaker and insufficient to affect chlorophyll directly. Mediated through some photodestructive inter­ ference with obviously more sensitive plastid components, such as their ribosomes, further chlorophyll accumulation was, however, prevented. 
  Reference    Z. Naturforsch. 37c, 898 (1982); received July 7 1982 
  Published    1982 
  Keywords    Bleaching Herbicides, Carotenoids, Chlorophyll, Photooxidation, Plastid rRNA 
  Similar Items    Find
 DEBUG INFO      
 TEI-XML for    default:Reihe_C/37/ZNC-1982-37c-0898.pdf 
 Identifier    ZNC-1982-37c-0898 
 Volume    37 
5Author    C. Buschm, K.H G RuRequires cookie*
 Title    Herbicides which Inhibit Electron Transport or Produce Chlorosis and Their Effect on Chloroplast Development in Radish Seedlings II. Pigment Excitation, Chlorophyll Fluorescence and Pigment-Protein Complexes  
 Abstract    DCM U, bentazon, amitrole and SA N 6706 affected the form ation o f the pigm ent-protein com ­ plexes and caused drastic alterations in the absorption o f light and in the transfer o f the absorbed energy in the antennae systems. Bentazon and D C M U , photosystem II inhibitors, did not change the pigment absorption and fluorescence excitation spectra. After application o f both herbicides the long wavelength fluorescence em ission band at 740 nm was reduced sim ilar as in young d e ­ veloping leaves. Although D C M U and bentazon inhibit the photosynthetic electron transport at the same site, bentazon mainly suppressed the form ation o f the photosystem I com plexes C P Ia and CPI while DC M U mainly reduced the photosystem II com plex CPa. Bentazon specifically en­ hanced the formation o f LHCP3. This may be im portant for the increased grana stacking in plas-tids from bentazon treated plants. The bleaching herbicides amitrole and SA N 6706 inhibited the form ation o f carotenoids lead ­ ing to an accumulation o f lycopene, phytofluene and phytoene, w hile the accum ulation o f chloro­ phylls was suppressed. This bleaching effect was m ost pronounced during growth under higher intensities o f light. In weak light (100 lux) am itrole reduced the long wavelength fluorescence maximum but the fluorescence excitation was not affected. W ith am itrole at 2000 lux and SAN 6706 at 100 lux the long wavelength em ission band was further decreased and the fluores­ cence excitation spectra point to a less efficient energy transfer to chlorophyll a. The fluorescence spectra changed due to herbicide treatment resem bled those o f not yet fully developed leaves. In contrast to the photosystem II herbicides the bleaching herbicides am itrole and SA N 6706 had a similar effect on the formation o f pigm ent-protein com plexes. After growth at 2000 lux both herbicides suppressed the formation o f the photosystem I com plex C P Ia and the photosystem II complex CPa. At 100 lux only the formation o f C P Ia was affected. Except for D C M U all herbicides assayed primarily changed the form ation o f photosystem I. 
  Reference    Z. Naturforsch. 37c, 632 (1982); received April 2 1982 
  Published    1982 
  Keywords    Bleaching Herbicides, Carotenoids, Chlorophylls, C hlorophyll Fluorescence, Photosystem II Herbicides, Pigm ent-Protein-Complexes 
  Similar Items    Find
 DEBUG INFO      
 TEI-XML for    default:Reihe_C/37/ZNC-1982-37c-0632.pdf 
 Identifier    ZNC-1982-37c-0632 
 Volume    37