Jasmonates interact with salicylic acid to confer basal thermotolerance in Arabidopsis thaliana

Shannon M. Clarke, Simona M. Cristescu, Otto Miersch, Frans J. M. Harren, Claus Wasternack, Luis Alejandro Jose Mur

Research output: Contribution to journalArticlepeer-review

Abstract

The cpr5-1 Arabidopsis thaliana mutant exhibits constitutive activation of salicylic acid (SA), jasmonic acid (JA) and ethylene (ET) signalling pathways and displays enhanced tolerance of heat stress (HS).

cpr5-1 crossed with jar1-1 (a JA-amino acid synthetase) was compromised in basal thermotolerance, as were the mutants opr3 (mutated in OPDA reductase3) and coi1-1 (affected in an E3 ubiquitin ligase F-box; a key JA-signalling component). In addition, heating wild-type Arabidopsis led to the accumulation of a range of jasmonates: JA, 12-oxophytodienoic acid (OPDA) and a JA-isoleucine (JA-Ile) conjugate. Exogenous application of methyl jasmonate protected wild-type Arabidopsis from HS.

Ethylene was rapidly produced during HS, with levels being modulated by both JA and SA. By contrast, the ethylene mutant ein2-1 conferred greater thermotolerance.

These data suggest that JA acts with SA, conferring basal thermotolerance while ET may act to promote cell death.
Original languageEnglish
Pages (from-to)175-187
Number of pages13
JournalNew Phytologist
Volume182
Issue number1
DOIs
Publication statusPublished - Apr 2009

Keywords

  • MUSTARD SEEDLINGS
  • RESPONSE PATHWAYS
  • PLANT DEFENSIN GENE
  • METHYL JASMONATE
  • DEPENDENT CELL-DEATH
  • INDUCED RESISTANCE
  • TEMPERATURE STRESS
  • SIGNALING PATHWAYS
  • REGULATED DEFENSE
  • INDUCED GENE-EXPRESSION

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