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Table 2 Expression of nitrate assimilation genes under different N conditions

From: Global transcription profiling reveals differential responses to chronic nitrogen stress and putative nitrogen regulatory components in Arabidopsis

Genes   Locus Fold limiting Fold stress Fold 2 hr Fold 24 hr
Nitrate transport      
Low-affinity nitrate transporter NRT1.1 At1g12110 1.3 1.8 1.8 -1.3
  NRT1.2 At1g69850 - - - -
  NRT1.3 At3g21670 -1.1 -2.1 1.0 1.6
  NRT1.4 At2g26690 -1.1 -2.1 1.2 2.4*
High-affinity nitrate transporter NRT2.1 At1g08090 - - - -
  NRT2.2 At1g08100 - - - -
  NRT2.3 At5g60780 - - - -
  NRT2.4 At5g60770 - - - -
  NRT2.5 At1g12940 - - - -
  NRT2.6 At3g45060 - - - -
  NRT2.7 At5g14570 - - - -
Nitrate reduction      
Nitrate reductase 1 (NR1)   At1g77760 -1.2 -1.9 11.1* 1.5
Nitrate reductase 2 (NR2)   At1g37130 -1.2 -3.3* 8.1* 2.9*
Nitrite reductase (NiR)   At2g15620 -1.2 -4.4* 15.1* 3.2*
urophorphyrin III methylase (UPM1)   At5g40850 1.0 -1.5 10.1* 1.5
Fd NADP (+) reductase (FNR)   At4g05390 1.3 1.2 3.6* 1.0
   At1g30510 1.1 1.1 3.1* 1.0
   At4g32360 - - - -
   At5g66190 - - - -
   At1g20020 - - - -
   At5g66810 - - - -
Ammonia assimilation      
Glutamine synthetase GS1-1 At5g37600 1.7 4.7* -1.6 -3.4*
  GS1-2 At1g66200 - - - -
  GS1-3 At3g17820 - - - -
  GS1-4 At5g16570 1.7 6.9* -2.0 -3.7*
  GS1-5 At1g48470 - - - -
Glutamate synthetase GS2 At5g35630 - - - -
  GOGAT1 At5g04140 - - - -
  GOGAT2 At2g41220 - - - -
  GOGAT3 At5g53460 - - - -
Asparagines synthetase AS1 At3g47340 - - - -
  AS2 At5g65010 -1.3 -3.2* 7.6* 2.9*
  AS3 At5g10240 - - - -
  1. Fold changes under different N conditions were presented: sufficient N vs. limiting N (fold, limiting); sufficient N vs. stress N (fold, stress); stress N vs. 2 hr induction (fold, 2 hr); stress N vs. 24 hr induction (fold, 24 hr). Negative number means gene expression down-regulated in said condition, and positive number means gene expression up-regulated in said condition. *significant from our SAM analysis;
  2. ---- no fluctuation under all N conditions
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BMC Genomics

ISSN: 1471-2164

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