Caterpillar saliva interferes with induced Arabidopsis thaliana defence responses via the systemic acquired resistance pathway

Arabidopsis thaliana (L.) Heynh. genotypes limited in their ability to mount either octadecanoid-dependent induced resistance (IR⁻) or systemic acquired resistance (SAR⁻) were used to characterize the roles of these pathways in plant-herbivore interactions. Molecular and biochemical markers of IR we...

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Bibliographic Details
Published in:Journal of experimental botany 2008-06, Vol.59 (9), p.2437-2448
Main Authors: Weech, Marie-Hélène, Chapleau, Mélanie, Pan, Li, Ide, Christine, Bede, Jacqueline C
Format: Article
Language:English
Subjects:
Animals
Arabidopsis - enzymology
Arabidopsis - genetics
Arabidopsis - physiology
Arabidopsis Proteins - genetics
Arabidopsis Proteins - metabolism
Arabidopsis thaliana
Biological and medical sciences
Biosynthesis
Catechol Oxidase - genetics
Catechol Oxidase - metabolism
Caterpillar
Caterpillars
cross-talk
Defensins - genetics
Defensins - metabolism
Ecosystem
Enzymes
Fundamental and applied biological sciences. Psychology
gene expression
Gene Expression Regulation, Plant
Generalities. Disease free stocks
Genes
Genotypes
Herbivores
induced resistance
Oxidases
Phytopathology. Animal pests. Plant and forest protection
Plant Growth Regulators - metabolism
Plants
plant–insect interactions
Research Papers
Saliva
Saliva - metabolism
salivary elicitors
Secretion
Spodoptera - physiology
Spodoptera exigua
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Summary:Arabidopsis thaliana (L.) Heynh. genotypes limited in their ability to mount either octadecanoid-dependent induced resistance (IR⁻) or systemic acquired resistance (SAR⁻) were used to characterize the roles of these pathways in plant-herbivore interactions. Molecular and biochemical markers of IR were analysed in plants subject to herbivory by caterpillars of the beet armyworm, Spodoptera exigua Hübner, which had either intact or impaired salivary secretions since salivary enzymes, such as glucose oxidase, have been implicated in the ability of caterpillars to circumvent induced plant defences. Transcript expression of genes encoding laccase-like multicopper oxidase [AtLMCO4 (polyphenol oxidase)] and defensin (AtPDF1.2) showed salivary-specific patterns which were disrupted in the SAR⁻ mutant plants. The activity of octadecanoid-associated anti-nutritive proteins, such as LMCO and trypsin inhibitor, showed similar patterns. Gene and protein changes parallel plant hormone levels where elevated jasmonic acid was observed in wild-type plants fed upon by caterpillars with impaired salivary secretions compared with plants subject to herbivory by normal caterpillars. This salivary-specific difference in jasmonic acid levels was alleviated in SAR⁻ mutants. These results support the model that caterpillar saliva interferes with jasmonate-dependent plant defences by activating the SAR pathway.
ISSN:0022-0957
1460-2431
DOI:10.1093/jxb/ern108