Cyanogenic polimorphysm in brackens, Pteridium arachnoideum and P. caudatum, from the northern Andes
AUTOR(ES)
Oliveros-Bastidas, Alberto de J., Alonso-Amelot, Miguel E.
FONTE
Química Nova
DATA DE PUBLICAÇÃO
2010
RESUMO
Cyanogenesis in Pteridium caudatum and P. arachnoideum has been examined. Samples of the Andes of South America furnished from 0 to 4.63 mg of prunasin g-1 of frond dry weight (dw) in P. caudatum and from 0 to 103 mg of g-1 dw in P. arachnoideum. In both fern species the continuous distribution of prunasin suggested cyanogenic polymorphism. The frequency of cyanogenic morphs was 84.7% for P. caudatum and 98.6% for P. arachnoideum. Cyanogenic activity was highest in the young crozier and waned rapidly with frond growth. The crozier head was found to yield HCN much more than the stipe.
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