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Evidence for the nitrate-dependent spatial regulation of the nitrate reductase gene in chicory roots

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Abstract

Young chicory plants (Cichorium intybus L. var. Witloof) show a tenfold higher nitrate reductase NR activity in roots compared to leaves. Northern analysis revealed, besides the nitrate inducibility of the nitrate reductase gene (nia), a higher level of expression in the roots. By modifying the external nitrate concentration the NR activity in the leaves remained negligible whereas a maximal activity was observed in the roots when grown in the presence of 5 mM nitrate. Surprisingly, variation of the external nitrate concentration induced changes in the spatial regulation of nia within the root. In-situ hybridization mainly localized nia mRNA in the cortical cells of roots grown at low nitrate concentrations (0.2 mM). At high nitrate concentrations (5 mM), nia mRNA was more abundant in the vascular tissues. The root apex revealed a strong signal under both conditions. The isolation and characterization of the NR structural gene from chicory is also presented. Southern blot analysis revealed the presence of a single nia gene per haploid genome of chicory.

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Abbreviations

cNRs:

chicory nitrate reductase cDNA

DIG:

digoxigenin

MoCo:

molybdenum cofactor

NiR:

nitrite reductase

NG:

nitrate reductase genomic sequence

NR:

nitrate reductase

NRA:

nitrate reductase activity

PCR:

polymerase chain reaction

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Correspondence to Serge Rambour.

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The authors wish to thank W. Ardiles Diaz, J. Gielen and R. Villarroel from the Lab. of Genetics, Gent for the DNA sequencing. We are indebted to P. Rouze and G. Engler for critical reading of the manuscript. B.P. is indebted to the European Molecular Biology Organization (Heidelberg, Germany) for a short-term fellowship. D.V.D.S. is a Senior Research Associate of the National Fund for Scientific Research (Belgium). This work was supported by the Conseil Regional Nord-Pas-de-Calais, France.

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Palms, B., Goupil, P., de Almeida Engler, J. et al. Evidence for the nitrate-dependent spatial regulation of the nitrate reductase gene in chicory roots. Planta 200, 20–27 (1996). https://doi.org/10.1007/BF00196644

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