Potential role of lipoxygenases in defense against insect herbivory

G. W. Felton, J. L. Bi, C. B. Summers, A. J. Mueller, S. S. Duffey

Research output: Contribution to journalArticlepeer-review

74 Scopus citations

Abstract

The potential role of the plant enzyme lipoxygenase in host resistance against the corn earworm Helicoverpa zea was examined. Lipoxygenase is present in most of the common host plants of H. zea, with highest activity in the leguminous hosts such as soybean and redbean. Treatment of dietary proteins with linoleic acid and lipoxygenase significantly reduced the nutritive quality of soybean protein and soy foliar protein. Larval growth was reduced from 24 to 63% depending upon treatment. Feeding by H. zea on soybean plants caused damage-induced increases in foliar lipoxygenase and lipid peroxidation products. Larvae feeding on previously wounded plant tissue demonstrated decreased growth rates compared to larvae feeding on unwounded tissue. Midgut epithelium from larvae feeding on wounded tissues showed evidence of oxidative damage as indicated by significant increases in lipid peroxidation products and losses in free primary amines. The potential role of oxidative and nutritional stress as a plant defensive response to herbivory is discussed.

Original languageEnglish (US)
Pages (from-to)651-666
Number of pages16
JournalJournal of Chemical Ecology
Volume20
Issue number3
DOIs
StatePublished - Mar 1 1994

All Science Journal Classification (ASJC) codes

  • Ecology, Evolution, Behavior and Systematics
  • Biochemistry

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