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1999 (1)
1995 (1)
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1Author    Claus Bornemann, Hartmut FollmannRequires cookie*
 Abstract    Infection o f Chlorella-like green algae with freshwater phycoviruses is associated with a large and rapid de­ mand for D N A precursors which cannot be met by the algal deoxyribonucleotide-synthesizing enzymes. We have demonstrated in these cells an up to ten-fold in­ crease o f the key enzyme, ribonucleotide reductase, 1 —2 h post infection. The enzyme activity has been par­ tially enriched from cell extracts. In vitro, it differs from that o f uninfected algae in three characteristic parame­ ters, viz. eight-fold higher resistance to millimolar hy­ droxyurea concentrations, much higher optimum con­ centration o f an allosteric effector nucleotide, thymidine triphosphate, and an unusually low temperature opti­ mum at 20 °C. We conclude that the large D N A phyco­ viruses, like Herpes and pox viruses, code for their own specific ribonucleotide reductase. 
  Reference    Z. Naturforsch. 48c, 113 (1993); received September 18 1992 
  Published    1993 
  Keywords    Chlorella sp, Deoxyribonucleotides, Phycodnaviridae, Ribonucleotide Reductase, Virus Infection 
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 TEI-XML for    default:Reihe_C/48/ZNC-1993-48c-0113_n.pdf 
 Identifier    ZNC-1993-48c-0113_n 
 Volume    48 
2Author    Jaber Rahoutei3, MatildeB. Arón3, IsabelG. Arcía-Luqueb, Magdolna Droppac, András Neményic, G. Ábor, H. OrváthcRequires cookie*
 Title    Effect of Tobamovirus Infection on Thermoluminescence Characteristics of Chloroplasts from Infected Plants  
 Abstract    Changes of thermoluminescence characteristics as well as the 0 2-evolving capacity was analysed in chloroplasts isolated from Nicotiana benthamiana infected with pepper and pa­ prika mild mottle viruses and their chimeric hybrids. The electron transport activity in thyla­ koids of virus-infected plants was inhibited and could be restored by adding DPC or Ca2+ which indicated that the virus infection altered the oxygen-evolving complex. In thermolumi­ nescence characteristics of plants infected with either viruses, the first well defined response was a shift in the peak position of the B band from 20 °C to 35 °C corresponding to S3(S2)Q b-and S2Q b~ charge recombinations, respectively, which showed an inhibition in the formation of higher S states in the water splitting system. Simultaneously, a new band ap­ peared around 70 °C due to chemiluminescence of lipid peroxidation. Further progress of the viral infection dramatically decreased the intensity of bands originated from charge re­ combinations with a concomitant increase of the band at 70 °C indicating the general oxida­ tive breakdown of injured thylakoids. 
  Reference    Z. Naturforsch. 54c, 634 (1999); received November 15 1998/January 15 1999 
  Published    1999 
  Keywords    Biotic Stress, Photosynthetic Electron Transport, Photosystem II, Thermoluminescence, Virus Infection 
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 TEI-XML for    default:Reihe_C/54/ZNC-1999-54c-0634.pdf 
 Identifier    ZNC-1999-54c-0634 
 Volume    54 
3Author    Gabor Gullner, Tamäs Kömives, Richard GäborjänyiRequires cookie*
 Title    Differential Alterations of Glutathione S-Transferase Enzyme Activities in Three Sorghum Varieties Following Viral Infection  
  Reference    Z. Naturforsch. 50c, 459—460 (1995); received February 14/March 2 1995 
  Published    1995 
  Keywords    Glutathione S-Transferase, Sorghum bicolor L, Sorghum sudanense L, Sugarcane Mosaic Virus, Virus Infection 
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 TEI-XML for    default:Reihe_C/50/ZNC-1995-50c-0459_n.pdf 
 Identifier    ZNC-1995-50c-0459_n 
 Volume    50