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1995[X]
1Author    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