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Journal of Experimental Botany, Vol. 51, No. 347, pp. 1017-1026, June 2000
© 2000 Oxford University Press

Two cDNAs representing alleles of the nitrate reductase gene of potato (Solanum tuberosum L. cv. Desirée): sequence analysis, genomic organization and expression1

Neil Harris2,6, Jonathan M. Foster3, Amar Kumar3, Howard V. Davies3, Christiane Gebhardt4 and John L. Wray2,5

2 Plant Sciences Laboratory, Sir Harold Mitchell Building, Division of Environmental and Evolutionary Biology, School of Biology, University of St Andrews, St Andrews, Fife KY16 9TH, UK
3 Department of Cell and Environmental Physiology, Scottish Crop Research Institute, Invergowrie, Dundee DD2 5DA, UK
4 Max Planck Institut für Züchtungsforschung, Carl von Linne Weg 10, D-50829 Köln, Germany

Two, different, full-length cDNAs, StNR2 and StNR3, of 3049 and 3066 nucleotides, respectively, were isolated from a Solanum tuberosum L. cv. Desirée leaf cDNA library by an RT-PCR approach. Conceptual translation of the longest open reading frame of each cDNA showed that they could encode a protein of 911 amino acids in each case with an Mr of 102.6 and 102.5 kDa, respectively, and with 99.7% identity with each other. The cDNAs have a high degree of sequence similarity with all higher plant nitrate reductases (NRs) and possess structural characteristics expected of NADH-NR proteins, consistent with enzyme activity data. Southern analysis of genomic DNA suggested the presence of a single NR gene in the potato genome whilst studies using the mapping population F1840, and the full-length StNR2 cDNA as hybridization probe, identified a single NR locus within the potato genome that is located on chromosome XI. The two cDNAs identified here are probably derived from two transcribing alleles of this single gene. Distribution of total NR transcript and of NADH-NR activity, in different organs of compost-grown plants, depended on the level of nitrate supplied: at low nitrate level transcript and activity were detected only in leaf and stem tissue whilst at high nitrate level they could also be detected in root and stolon. An RT-PCR approach was used to differentiate between the transcripts derived from the two identified alleles and to show that the pattern of transcription of the two identified alleles of the potato nia gene, in the organs studied, is the same.

Key words: Gene expression, genomic organization, nitrate reductase, potato, Solanum tuberosum L. cv. Desirée.


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