title: Shoot-applied MeJA suppresses root nodulation in Lotus japonicus.
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 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.
authors.affiliation: Department of Biological Sciences, Graduate School of Science, The University of Tokyo, Bunkyo, Japan. ntomomi@biol.s.u-tokyo.ac.jp
authors.forename: Tomomi
authors.initials: T
authors.lastname: Nakagawa
authors.forename: Masayoshi
authors.initials: M
authors.lastname: Kawaguchi
mesh_terms: D000085:Acetates / Q000494:pharmacology*; D001483:Base Sequence; D003517:Cyclopentanes / Q000494:pharmacology*; D018744:DNA, Plant / Q000235:genetics; D017343:Genes, Plant; D000070116:Lotus / Q000187:drug effects* / Q000235:genetics / Q000382:microbiology*; D009154:Mutation; D054883:Oxylipins; D010641:Phenotype; D010935:Plant Diseases / Q000235:genetics / Q000382:microbiology; D010937:Plant Growth Regulators / Q000494:pharmacology*; D018517:Plant Roots / Q000187:drug effects / Q000382:microbiology; D018520:Plant Shoots / Q000187:drug effects; D015398:Signal Transduction; D013559:Symbiosis
chemical_list: D000085:Acetates; D003517:Cyclopentanes; D018744:DNA, Plant; D054883:Oxylipins; D010937:Plant Growth Regulators; C072239:methyl jasmonate