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Plant and Cell Physiology Advance Access published online on November 28, 2007
Plant and Cell Physiology, doi:10.1093/pcp/pcm168
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© The Author 2007. Published by Oxford University Press on behalf of Japanese Society of Plant Physiologists. All rights reserved. For Permissions, please e-mail: journals.permissions@oxfordjournals.org

Function of jasmonate in response and tolerance of Arabidopsis to thrips feeding

Hiroshi Abe1, Jun Ohnishi2, Mari Narusaka3, Shigemi Seo4, Yoshihiro Narusaka3, Shinya Tsuda2 and Masatomo Kobayashi1

1Department of Biological Systems, RIKEN BioResource Center, Tsukuba 305-0074, Japan
2Department of Plant Pathology, National Agricultural Research Center, Tsukuba 305-8666, Japan
3Department of Biology, Tokyo Gakugei University, Koganei 184-8501, Japan
4Department of Plant Physiology, National Institute of Agrobiological Sciences, Tsukuba 305-8666, Japan

Corresponding author: Dr. Hiroshi ABE, Department of Biological Systems, RIKEN BioResource Center–Japan, 3-1-1 Koyadai, Tsukuba, Ibaraki 305-0074, Japan, Tel.: +81-29-836-9189, Fax: +81-29-836-9053, E-mail: ahiroshi{at}brc.riken.jp


  Abstract

We analyzed the interaction between Arabidopsis and western flower thrips (Frankliniella occidentalis), which is one of the most serious insect pests of cultivated plants. We focused on the function of the immunity-related plant hormones jasmonate (JA), ethylene (ET), and salicylic acid (SA) in the plant's response to thrips feeding. Expression of the marker genes for each hormone response was induced by thrips feeding in wild type (WT) plants. Further analyses in the hormone-related mutants coi1-1 (JA insensitive), ein2-1 and ein3-1 (ET insensitive), and eds16-1 (SA deficient) suggested the importance of these hormones in the plant response to feeding. Comparative transcriptome analyses suggested a strong relationship between thrips feeding and JA treatment but not ET or SA treatment. The jasmonate content of WT plants was significantly increased after thrips feeding. Moreover, coi1-1, but not ein2-1, showed lower feeding tolerance against thrips than the WT. Application of JA to WT plants before thrips feeding enhanced the plants' feeding tolerance. Jasmonate modulates several defense responses in cooperation with ET, but application of the ET precursor 1-aminocyclopropane-carboxylic acid had a marked negative effect on feeding tolerance. Our results indicate that JA plays an important role in Arabidopsis in terms of response to, and tolerance against, thrips feeding.

Keywords: Arabidopsis thaliana - ethylene - Frankliniella occidentalis - insect feeding - jasmonate - western flower thrips

(Received November 9, 2007; Accepted November 19, 2007)
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