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

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281 Citations (SciVal)

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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