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Plant and Cell Physiology Advance Access published online on June 4, 2005
Plant and Cell Physiology, doi:10.1093/pcp/pci138
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Plant and Cell Physiology 2005 © The Japanese Society of Plant Physiologists (JSPP); all rights reserved.
Received December 5, 2004
Accepted May 21, 2005

Regular Paper

Expression of LjENOD40 Genes in Response to Symbiotic and Non-Symbiotic Signals: LjENOD40-1 and LjENOD40-2 Are Differentially Regulated in Lotus japonicus

Naoya Takeda 1, Satoru Okamoto 1, Makoto Hayashi 1*, and Yoshikatsu Murooka 1

1 Department of Biotechnology, Graduate School of Engineering, Osaka University, 2-1 Yamadaoka, Suita, Osaka 565-0871, Japan

* To whom correspondence should be addressed.
Makoto Hayashi, E-mail: hayashi{at}bio.eng.osaka-u.ac.jp


  Abstract

Nitrogen fixation in nodules provides legume plants an ability to grow in nitrogen-starved soil. Infection of the host plants by microsymbionts triggers various physiological and morphological changes during nodule formation. In Lotus japonicus, expression of early nodulin (ENOD) genes is triggered by perception of bacterial signal molecules, Nodulation factors (Nod factors). We examined the expression patterns of ENOD40 genes during nodule formation process. Two ENOD40 genes of L. japonicus were specifically expressed in the nodule formation process, but they showed different expression patterns upon infection. Each ENOD40 gene demonstrates an individual specificity and regulation to rhizobial infection.

Keywords: ENOD40; Lotus japonicus; Mesorhizobium loti; Nod factors; Nodulation.
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