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JXB Advance Access originally published online on May 13, 2003
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Journal of Experimental Botany, Vol. 54, No. 388, pp. 1789-1791, July 1, 2003
© 2003 Oxford University Press

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

Received 27 January 2003; Accepted 26 March 2003

Emmanouil Flemetakis1, Maria Dimou1, Daniela Cotzur1, Rodica C. Efrose1, Georgios Aivalakis1, Gillian Colebatch2, Michael Udvardi2 and Panagiotis Katinakis{dagger},1

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

* The nucleotide sequence appeared in the DDBJ/EMBL/GenBank database with the accession number AJ538041.
{dagger} To whom correspondence should be addressed. Fax: +30 210 5294314. E-mail: bmbi2kap{at}aua.gr
Abbreviations: dpi, days post-infection.

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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