Absorption and storage of phosphorus by larval Manduca sexta

H. Arthur Woods, Marc C. Perkins, James Elser, Jon Harrison

Research output: Contribution to journalArticle

39 Scopus citations

Abstract

The role of phosphorus (P) in numerous important biological structures, coupled with the observation that P-content of many insect foods is disproportionately low, suggests that P may be a critical nutrient for growing insects - however, the few studies examining the effects of dietary P on insect performance have generally found only weak relationships. This mismatch may be reconciled by understanding the physiological mechanisms by which insects handle P. Here we describe P processing by larvae of Manduca sexta. When given un-manipulated leaves of a common host plant, Datura wrightii, fifth-instar larvae retained about 85% of P consumed; when given P-enriched leaves larvae retained only 25% of P consumed. Analysis of gut concentrations of P at four sites along the digestive tract, and in leaves and feces, indicates that the rectum is the primary site of P transport between the gut and body and that differences in P retention may be accounted for by differential rates of rectal P transport. Larvae given P-enriched leaves also showed an eightfold increase in the concentration of P in the hemolymph, primarily as α-glycerophosphate - but only a 12% increase in the concentration of P in body tissues, suggesting that hemolymph plays a central role in storage and buffering of P.

Original languageEnglish (US)
Pages (from-to)555-564
Number of pages10
JournalJournal of insect physiology
Volume48
Issue number5
DOIs
StatePublished - Jul 17 2002

Keywords

  • Manduca sexta
  • Nutrition
  • Phosphate
  • Phosphorus
  • Storage

ASJC Scopus subject areas

  • Physiology
  • Insect Science

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