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JXB Advance Access originally published online on December 16, 2008
Journal of Experimental Botany 2009 60(2):641-650; doi:10.1093/jxb/ern316
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© 2008 The Author(s).
This is an Open Access article distributed under the terms of the Creative Commons Attribution Non-Commercial License (http://creativecommons.org/licenses/by-nc/2.0/uk/) which permits unrestricted non-commercial use, distribution, and reproduction in any medium, provided the original work is properly cited. This paper is available online free of all access charges (see http://jxb.oxfordjournals.org/open_access.html for further details)

RESEARCH PAPER

Molecular responses of Lotus japonicus to parasitism by the compatible species Orobanche aegyptiaca and the incompatible species Striga hermonthica

Yukihiro Hiraoka, Hiroaki Ueda and Yukihiro Sugimoto*

Graduate School of Agricultural Science, Kobe University, Rokkodai, Nada, 657-8501 Kobe, Japan

* To whom correspondence should be addressed: E-mail: yukihiro{at}kobe-u.ac.jp

Lotus japonicus genes responsive to parasitism by the compatible species Orobanche aegyptiaca and the incompatible species Striga hermonthica were isolated by using the suppression subtractive hybridization (SSH) strategy. O. aegyptiaca and S. hermonthica parasitism specifically induced the expression of genes involved in jasmonic acid (JA) biosynthesis and phytoalexin biosynthesis, respectively. Nodulation-related genes were almost exclusively found among the Orobanche-induced genes. Temporal gene expression analyses revealed that 19 out of the 48 Orobanche-induced genes and 5 out of the 48 Striga-induced genes were up-regulated at 1 dai. Four genes, including putative trypsin protease inhibitor genes, exhibited systemic up-regulation in the host plant parasitized by O. aegyptiaca. On the other hand, S. hermonthica attachment did not induce systemic gene expression.

Key words: Host response, Lotus japonicus, Orobanche, Striga, suppression subtractive hybridization

Received 3 September 2008; Revised 3 November 2008 Accepted 12 November 2008


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