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JXB Advance Access published online on May 13, 2003
Journal of Experimental Botany, doi:10.1093/jxb/erg179
© 2003 by Oxford University Press
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Received January 27, 2003; accepted March 26, 2003
© 2003 Society for Experimental Biology

GENE NOTE

A sucrose transporter, LjSUT4, is up-regulated during Lotus japonicus nodule development

Emmanouil Flemetakis 1, Maria Dimou 2, Daniela Cotzur 1, Rodica C. Efrose 1, Georgios Aivalakis 1, Gillian Colebatch 3, Michael Udvardi 3, Panagiotis Katinakis 1*

1 Agricultural University of Athens, Department of Agricultural Biotechnology, Iera Odos 75, 118 55 Athens, Greece
2 Agricultural University of Athens, Department of Agricultural Biotechnology, Iera Odos 75, 118 55 Athens, Greece
3 Max Plank Institute for Molecular Plant Physiology, Am Mühlenberg, D-14476 Golm, Germany

* To whom correspondence should be addressed. E-mail: bmbi2kap{at}aua.gr.


  Abstract

LjSUT4, encoding a putative sucrose transporter, was identified in a Lotus japonicus nodule cDNA library. The deduced amino acid sequence showed a high degree of identity with sucrose transporters from other plants. Semi-quantitative RT-PCR analysis demonstrated that the L. japonicus SUT4 gene was expressed at high levels in both roots and nodules. In situ hybridization revealed that, in young nodules, SUT4 mRNA transcripts are present in vascular bundles, inner cortex and both infected and uninfected cells while, in mature nodules, accumulation of transcripts was restricted only in vascular bundles and the inner cortex. The results indicated that LjSUT4 codes for a putative sucrose transporter, and its expression pattern suggests a possible shift in the mechanism of sugar transport during nodule development. The role of this polypeptide in sucrose transport and metabolism is discussed.

Key words: In situ hybridization, Lotus japonicus, root nodules, sucrose transporter, symbiosis.


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