Nakagawa Tomomi, Kawaguchi Masayoshi
Department of Biological Sciences, Graduate School of Science, The University of Tokyo, Bunkyo, Japan.
Plant Cell Physiol. 2006 Jan;47(1):176-80. doi: 10.1093/pcp/pci222. Epub 2005 Oct 28.
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.
为维持共生平衡，豆科植物拥有一种名为结瘤自调控（AUT）的系统调节机制。由于AUT在示意图上与植物-病原体相互作用中发现的系统抗性相似，我们研究了茉莉酸甲酯（MeJA）或水杨酸甲酯（MeSA）对百脉根结瘤的影响。对地上部分施用MeJA强烈抑制了野生型的结瘤，甚至抑制了har1突变体的超结瘤，而MeSA则没有效果。MeJA抑制了结瘤的早期阶段，包括侵染线形成和NIN基因表达，还抑制了侧根形成。这些发现表明，茉莉酸和/或其相关化合物参与了AUT信号传导。
