Differential formation of octadecadienoic acid and octadecatrienoic acid products in control and injured/infected potato tubers

P. Srinivas Reddy, T. Charles Kumar, M. Narsa Reddy, C. Sarada, P. Reddanna*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

17 Scopus citations

Abstract

Lipoxygenases in plants have been implicated in the activation of defense responses against injury/infection. Pathogen-derived polyunsaturated fatty acids, such as arachidonic acid, eicosapentaenoic acid and their metabolites have been shown to elicit defense responses against pathogen infection in plants. However, not much is known about the role of host-derived fatty acids and their metabolites in plant defense responses. In this study, isolation and characterisation of endogenous lipoxygenase metabolites formed in potato tubers in response to injury/infection was undertaken. While 9-hydroperoxyoctadecadienoic acid (9-HPODE), derived from octadecdienoic acid (linoleic acid) is the major lipoxygenase product formed in control potato tubers, 9-hydroperoxyoctadecatrienoic acid (9-HPOTrE), derived from octadecatrienoic acid (α-linolenic acid) is the major lipoxygenase product formed in potato tubers in response to injury or infection with Rhizoctonia bataticola. As a result, the relative ratio of 9-HPODE to 9-HPOTrE showed a shift from 4:1 in control to 1:2 and 1:4.5 in injured and infected potato tubers respectively. From this study, it is proposed that lipoxygenase metabolites of octadecadienoic acid may be involved in physiological responses under control conditions, while octadecatrienoic acid metabolites are mediating the defense responses. This forms the first report on the differential formation of endogenous lipoxygenase products in potato tubers under control and stress conditions. Copyright (C) 2000 Elsevier Science B.V.

Original languageEnglish (US)
Pages (from-to)294-300
Number of pages7
JournalBiochimica et Biophysica Acta - Molecular and Cell Biology of Lipids
Volume1483
Issue number2
DOIs
StatePublished - Jan 17 2000

Keywords

  • Infection
  • Injury
  • Lipoxygenase
  • Octadecadienoic acid
  • Octadecatrienoic acid
  • Potato tuber

ASJC Scopus subject areas

  • Molecular Biology
  • Cell Biology

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