Jasmonates act with salicylic acid to confer basal thermotolerance in Arabidopsis thaliana
Open Access
- 9 January 2009
- journal article
- research article
- Published by Wiley in New Phytologist
- Vol. 182 (1), 175-187
- https://doi.org/10.1111/j.1469-8137.2008.02735.x
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.Keywords
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