Journal
NEW PHYTOLOGIST
Volume 182, Issue 1, Pages 175-187Publisher
WILEY
DOI: 10.1111/j.1469-8137.2008.02735.x
Keywords
Arabidopsis; COI1; cpr5-1; EIN2; jasmonic acid (JA); JAR1; salicylic acid (SA); thermotolerance
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Funding
- NZ Science and Technology Post-Doctorial Fellowship
- EU-FP6-Infrastructures-5 program [FP6-026183]
- 'Life Science Trace Gas Facility'
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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. New Phytologist (2009) 182: 175-187doi: 10.1111/j.1469-8137.2008.02735.x.
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