Sublethal concentrations of salicylic acid decrease the formation of reactive oxygen species but maintain an increased nitric oxide production in the root apex of the ethylene-insensitive never ripe tomato mutants

Irma Tari, Péter Poór, Katalin Gémes

Research output: Contribution to journalArticle

6 Citations (Scopus)

Abstract

The pattern of salicylic acid (SA)-induced production of reactive oxygen species (RO S) and nitric oxide (NO) were different in the apex of adventitious roots in wild-type and in the ethylene-insensitive Never ripe (Nr) mutants of tomato (Solanum lycopersicum L. cv Ailsa Craig). RO S were upregulated, while NO remained at the control level in apical root tissues of wildtype plants exposed to sublethal concentrations of SA. In contrast, Nr plants expressing a defective ethylene receptor displayed a reduced level of RO S and a higher NO content in the apical root cells. In wild-type plants NO production seems to be RO S(H 2O 2)-dependent at cell death-inducing concentrations of SA, indicating that RO S and NO may interact to trigger oxidative cell death. In the absence of significant RO S accumulation, the increased NO production caused moderate reduction in cell viability in root apex of Nr plants exposed to 10 -3 M SA. This suggests that a functional ethylene signaling pathway is necessary for the control of RO S and NO production induced by SA.

Original languageEnglish
Pages (from-to)1263-1266
Number of pages4
JournalPlant Signaling and Behavior
Volume6
Issue number9
DOIs
Publication statusPublished - Sep 2011

Keywords

  • Ethylene receptor mutant
  • Never ripe
  • Nitric oxide
  • Reactive oxygen species
  • Root apex
  • Salicylic acid
  • Tomato

ASJC Scopus subject areas

  • Plant Science

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