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1995 (1)
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1Author    Gertrud Wiese, Doris Hugo-Wissemann, HansJ. GrambowRequires cookie*
 Title    An Improved Procedure for the Quantitative Estimation of the Rust Fungus in Infected Plant Tissue  
 Abstract    A quantitative estimation of the rust fungus in infected wheat leaves was possible following enzymatic hydrolysis of the chitin and colorimetric determination of the N-acetyl-glucosamine released. The apparently complex cell wall structure of the fungal structures made it necessary, how­ ever, to use an enzyme mixture of chitinase and cellulase in order to make accessible the chitin of the cell wall for diges­ tion by chitinase. In applying this method the measurement is not appreciably influenced by already formed uredio-spores as would otherwise be the case were the chitin to be determined on the basis of glucosamine after chemical hydrolysis. 
  Reference    Z. Naturforsch. 41c, 1127—1130 (1986); received July 17. 1986 
  Published    1986 
  Keywords    Rust Fungus, Chitin, N-Acetylglucosamine 
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 TEI-XML for    default:Reihe_C/41/ZNC-1986-41c-1127_n.pdf 
 Identifier    ZNC-1986-41c-1127_n 
 Volume    41 
2Author    OmP. Agrawal, Klaus SchellerRequires cookie*
 Title    Sclerotization of Insect Cuticle in a Cell-Free System  
 Abstract    Incubation o f deproteinized larval cuticle (chitin flakes) with purified arylphorin (calli-phorin) or larval haemolymph o f Calliphora vicina resulted in the formation o f a chitin-protein complex. Enzymatic oxidation o f N-ß-alanyldopam ine (N D A B) in the presence o f chitin flakes or the chitin-protein com plex, resulted in various degrees o f cross-linking o f N B A D -quinone formed with chitin. This study confirms the involvement o f arylphorin in the process o f quinone tanning o f insect cuticle. 
  Reference    Z. Naturforsch. 45c, 129—131 (1990); received October 4 1989 
  Published    1990 
  Keywords    Arylphorin, Chitin, Cuticle, Sclerotization, Calliphora 
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 TEI-XML for    default:Reihe_C/45/ZNC-1990-45c-0129.pdf 
 Identifier    ZNC-1990-45c-0129 
 Volume    45 
3Author    Kohki Akiyamaa, Kazuyoshi Kawazua, Akio KobayashibRequires cookie*
 Title    Partially N-Deacetylated Chitin Oligomers (Pentamer to Heptamer) are Potential Elicitors for (+)-Pisatin Induction in Pea Epicotyls  
 Abstract    Oligomers (dimer to heptamer) of chitosan and their partially/completely N-acetylated derivatives were examined for (+)-pisatin-inducing activities in pea epicotyl elicitor assay at concentrations ranging from 6.25 to 100 j.ig/ml. The structures of the oligomers were analyzed by 'H NM R and M A L D I TOF MS spectrometers. The chitosan oligomers from dimer to tetramer were inactive, while the pentamer exhibited a moderate activity at 100 |ig/ml. The hexamer showed a pronounced activity at 100 |ag/ml, whereas the oligomer had no activity at the higher concentrations. Although the chitosan heptamer induced a moderate amount of (+)-pisatin (ca. 60 j.ig/g fr. wt.) at 50 (.ig/ml, the oligomer did not elicit pisatin formation at 100 |ig/ml. The dimer to tetramer of both partially N-deacetylated chitin (DAC) and chitin were totally inactive. The DAC pentamers (d.a. 31%, 52%), DAC hexamers (d.a. 26%, 41%), and DAC heptamers (d.a. 26%, 36%) exhibited significant elicitor activities at lower concen­ trations (6.25-25 [.ig/ml) than the native chitosan oligomers. The chitin pentamer to heptamer had weak or no activity. Both glucosamine and N-acetylglucosamine were inactive in the assay. These facts suggest that the DAC pentamer to heptamer may act as elicitors for pisatin induction in pea-fungus interactions. 
  Reference    Z. Naturforsch. 50c, 391—397 (1995); received January 4/January 15 1995 
  Published    1995 
  Keywords    Elicitor, Chitosan, Chitin, Phytoalexin, Pisum sativum 
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 TEI-XML for    default:Reihe_C/50/ZNC-1995-50c-0391.pdf 
 Identifier    ZNC-1995-50c-0391 
 Volume    50