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JXB Advance Access originally published online on March 12, 2004
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Journal of Experimental Botany, Vol. 55, No. 398, pp. 957-959, April 1, 2004
© 2004 Oxford University Press

GENE NOTE

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

Received 12 Novenber 2003; Accepted 20 January 2004

Luis E. Hernández1,*, Carolina Escobar1, Bjørn K. Drøbak2, Ton Bisseling1 and Nicholas J. Brewin2

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

* Present address and to whom correspondence should be sent: Laboratorio de Fisiología Vegetal, Departamento de Biología, Universidad Autónoma de Madrid, E-28049 Madrid, Spain. Fax: +34 913 978 191. E-mail: luise.hernandez{at}uam.es

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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