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Plant and Cell Physiology Advance Access first published online on October 28, 2005
This version published online on November 21, 2005
Plant and Cell Physiology, doi:10.1093/pcp/pci222
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Plant and Cell Physiology 2005 © The Japanese Society of Plant Physiologists (JSPP); all rights reserved.
Received September 26, 2005
Accepted October 24, 2005

Short Communication

Shoot-Applied MeJA Suppresses Root Nodulation in Lotus japonicus

Tomomi Nakagawa 1 * and Masayoshi Kawaguchi 2

1 Department of Biological Sciences, Graduate School of Science, The University of Tokyo, 7-3-1 Hongo, Bunkyo, Tokyo 113-0033, Japan; 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
2 Department of Biological Sciences, Graduate School of Science, The University of Tokyo, 7-3-1 Hongo, Bunkyo, Tokyo 113-0033, Japan; Core Research for Evolutional Science and Technology (CREST), Japan Science and Technology Agency, 4-1-8 Honcho, Kawaguchi, Saitama 332-0112, Japan

* To whom correspondence should be addressed.
Tomomi Nakagawa, E-mail: ntomomi{at}biol.s.u-tokyo.ac.jp


  Abstract

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 hyper-nodulation 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.

Keywords: autoregulation; ISR; MeJA; nodule; SAR; symbiosis.
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