Journal Article

Shoot-applied MeJA Suppresses Root Nodulation in <i>Lotus japonicus</i>

Tomomi Nakagawa and Masayoshi Kawaguchi

in Plant and Cell Physiology

Published on behalf of Japanese Society of Plant Physiologists

Volume 47, issue 1, pages 176-180
Published in print January 2006 | ISSN: 0032-0781
Published online January 2006 | e-ISSN: 1471-9053 | DOI: http://dx.doi.org/10.1093/pcp/pci222
Shoot-applied MeJA Suppresses Root Nodulation in Lotus japonicus

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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.

Keywords: Autoregulation; ISR; MeJA; Nodule; SAR; Symbiosis; AUT, autoregulation of root nodulation; ET, ethylene; ISR, induced systemic resistance; JA, jasmonic acid; MeJA, methyl jasmonate; MeSA, methyl salicylate; SA, salicylic acid; SAR, systemic acquired resistance

Journal Article.  3423 words.  Illustrated.

Subjects: Biochemistry ; Molecular and Cell Biology ; Plant Sciences and Forestry

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