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Effects of five different chemicals interfering with NO biosynthesis and scavenging on the expression profile of six genes differentially regulated by nitrate supply/depletion. Plants were grown for 24h in –NO3 – solution and then transferred to +NO3 – medium for 2h. The transcript accumulation of six genes (NR1, Hb, Hb2, NiR, NRT2.1, and NOA1) was examined after nitrate supply and in the presence of 1mM cPTIO, 1mM tungstate (W), and 0.2mM l-NAME. a.u., arbitrary units.
