Gene expression of the NO^sub 3^^sup -^ transporter NRT1.1 and the nitrate reductase NIA1 is repressed in Arabidopsis roots by NO^sub 2^^sup -^, the product of NO^sub 3^^sup -^ reduction

From: Plant Physiology | Date: June 1, 2003| Author: | Copyright information

NRT1.1 and NIA1 genes, which encode a nitrate (NO^sub 3^^sup -^) transporter and the minor isoform of NO^sub 3^^sup -^ reductase (NR), respectively, are overexpressed in roots of NR-deficient mutants of Arabidopsis grown on nutrient solution containing NO^sub 3^^sup -^ and reduced N. The overexpression is found only in mutants with reduced NIA2 activity, and disruption of the NIA1 gene alone has no effect on NRT1.1 expression. Because the up-regulation of NRT1.1 and NIA1 is observed in N-sufficient NR mutant plants, it cannot be related to a release of the general feedback repression exerted ...

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