Abstract
Gallic acid improved growth in Anacridium melanorhodon, and ingested gallic acid labelled with 14C was traced in the body of sixth-instar nymphs. Over 10% was retained in the body after 24 hr, mostly in the gut. Of the absorbed material, the greatest proportion was recovered from the integument. This also had the highest specific activity. Much of the label found in the integument was not readily extractable, but was apparently bound in the cuticle. It is proposed that the phenolic material was utilised in the stabilisation of cuticular protein, probably in an altered form. It is likely that this phytophagous insect, which feeds on plant material low in protein, may utilise plant phenols in lieu of tyrosine in the better known pathways for sclerotisation.
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