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JXB Advance Access published online on March 12, 2004
Journal of Experimental Botany, doi:10.1093/jxb/erh101
© 2004 by Oxford University Press
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Received November 12, 2003; accepted January 20, 2004
© 2004 Society for Experimental Biology

GENE NOTE

Novel expression patterns of phosphatidylinositol 3-hydroxy kinase in nodulated Medicago spp. plants

Luis E. Hernández 1*, Carolina Escobar 1, Bjørn K. Drøbak 2, Ton Bisseling 1, and Nicholas J. Brewin 2

1 Laboratory of Molecular Biology, Department of Plant Sciences, Wageningen Agricultural University, Dreijenlaan 3, 6703 HA Wageningen,The Netherlands
2 John Innes Centre, Norwich Research Park, Colney Lane, Norwich NR4 7UH, UK

* To whom correspondence should be addressed. E-mail: luise.hernandez{at}uam.es.


  Abstract

A cDNA clone encoding a phosphatidylinositol 3-kinase (PtdIns 3-kinase) has been characterized from Medicago truncatula, Mtpi3k, that is highly homologous to their counterparts from soybean (over 84%). The results suggest the presence of at least two genes coding PtdIns 3-kinases in M. truncatula. Mtpi3k transcript levels increased in nodules, compared with non-infected roots. Strikingly, Mtpi3k mRNA accumulated in young elongating stems at higher levels than that observed in other organs. Enhanced transcription of genes coding PtdIns 3-kinases might occur in tissues experiencing a high degree of vesicle trafficking and cell elongation.

Key words: Elongating stems, Medicago truncatula, nodules, phosphatidylinositol 3-kinase, transcripts.


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