Evolution of jasmonate and salicylate signal crosstalk

The evolution of land plants approximately 470 million years ago created a new adaptive zone for natural enemies (attackers) of plants. In response to attack, plants evolved highly effective, inducible defense systems. Two plant hormones modulating inducible defenses are salicylic acid (SA) and jasm...

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Bibliographic Details
Published in:Trends in plant science 2012-05, Vol.17 (5), p.260-270
Main Authors: Thaler, Jennifer S., Humphrey, Parris T., Whiteman, Noah K.
Format: Article
Language:English
Subjects:
Animals
Biological Evolution
Cyclopentanes - metabolism
embryophytes
evolution
herbivores
Host-Parasite Interactions
Insecta - physiology
insects
jasmonic acid
natural enemies
Oxylipins - metabolism
pathogens
phloem
Phylogeny
Plant Diseases - genetics
Plant Diseases - parasitology
plant hormones
Plants - classification
Plants - metabolism
Plants - parasitology
Salicylates - metabolism
salicylic acid
Signal Transduction
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Summary:The evolution of land plants approximately 470 million years ago created a new adaptive zone for natural enemies (attackers) of plants. In response to attack, plants evolved highly effective, inducible defense systems. Two plant hormones modulating inducible defenses are salicylic acid (SA) and jasmonic acid (JA). Current thinking is that SA induces resistance against biotrophic pathogens and some phloem feeding insects and JA induces resistance against necrotrophic pathogens, some phloem feeding insects and chewing herbivores. Signaling crosstalk between SA and JA commonly manifests as a reciprocal antagonism and may be adaptive, but this remains speculative. We examine evidence for and against adaptive explanations for antagonistic crosstalk, trace its phylogenetic origins and provide a hypothesis-testing framework for future research on the adaptive significance of SA–JA crosstalk.
ISSN:1360-1385
1878-4372
DOI:10.1016/j.tplants.2012.02.010