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Plant and Cell Physiology Advance Access originally published online on October 28, 2005
Plant and Cell Physiology 2006 47(1):176-180; doi:10.1093/pcp/pci222
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Short Communication

Shoot-applied MeJA Suppresses Root Nodulation in Lotus japonicus

Tomomi Nakagawa1,2,* and Masayoshi Kawaguchi1,3

1 Department of Biological Sciences, Graduate School of Science, The University of Tokyo, 7-3-1 Hongo, Bunkyo, Tokyo, 113-0033 Japan
2 Research Fellowships of the Japan Society for the Promotion of Science for Young Scientists (JSPS), Japan Society for the Promotion of Science, 8 Ichi-Ban-Cho, Chiyoda, Tokyo, 102-8472 Japan
3 Core Research for Evolutional Science and Technology (CREST), Japan Science and Technology Agency, 4-1-8 Honcho, Kawaguchi, Saitama, 332-0112 Japan

* Corresponding author: E-mail, ntomomi{at}biol.s.u-tokyo.ac.jp; Fax, +81-3-5841-4458.

To maintain a symbiotic balance, leguminous plants have a systemic regulatory system called autoregulation of nodulation (AUT). Since AUT is schematically similar to systemic resistance found in plant–pathogen interactions, we examined the effects of methyl jasmonate (MeJA) or methyl salicylate (MeSA) on nodulation in Lotus japonicus. Shoot-applied MeJA strongly suppressed nodulation in the wild type and even hypernodulation in the har1 mutant, whereas MeSA exhibited no effect. MeJA inhibited early stages of nodulation, including infection thread formation and NIN gene expression, and also suppressed lateral root formation. These findings suggest that jasmonic acid and/or its related compounds participate in AUT signaling.

(Received September 26, 2005; Accepted October 24, 2005)
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