Lipoxygenase metabolites of α-linolenic acid in the development of resistance in pigeonpea, Cajanus cajan (L.) Millsp, seedlings against Fusarium udum infection

P. Uma Maheswari Devi, P. Srinivas Reddy, N. R. Usha Rani, K. J. Reddy, M. Narsa Reddy, P. Reddanna*

*Corresponding author for this work

Research output: Contribution to journalShort survey

34 Scopus citations

Abstract

Lipoxygenase (LOX) activity was measured in germinating pigeonpea Cajanus cajan seedlings, resistant (ICP-8863) and susceptible (ICP-2376) to wilt fungus, before and after infection with Fusarium udum. LOX activity was significantly higher in the resistant than in the susceptible cultivars of pigeonpea and was enhanced further in response to infection with Fusarium udum. This increase in LOX activity in the resistant cultivars of pigeonpea appears to be due to the induction of lipoxygenase isozymes in response to infection. Analysis of the endogenous LOX metabolites in pigeonpea seedlings revealed the predominant formation of 13-hydroperoxyoctadecadienoic acid (13-HPODE) in healthy seedlings and 13-hydroperoxyoctadecatrienoic acid (13-HPOTrE) in infected seedlings. Further studies on the effects of LOX metabolites on the growth and multiplication of Fusarium udum showed that HPOTrEs, LOX metabolites of α-linolenic acid, are more anti-fungal compared to HPODEs, LOX metabolites of linoleic acid.

Original languageEnglish (US)
Pages (from-to)857-865
Number of pages9
JournalEuropean Journal of Plant Pathology
Volume106
Issue number9
DOIs
StatePublished - Dec 1 2000

Keywords

  • 13-hydroperoxyoctadecadienoic acid
  • 13-hydroperoxyoctadecatrienoic acid

ASJC Scopus subject areas

  • Agronomy and Crop Science
  • Plant Science
  • Horticulture

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