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- W2122931818 abstract "This study was conducted to determine whether the inhibition of nitrate reductase activity (NRA; EC 1.6.6.1) in barley (Hordeum vulgare L. var. CM-72) roots by the amino acids (glutamic, aspartic, glutamine and asparagine) is a direct effect or indirect due to inhibition of the NO3− uptake system. Roots of 8-day-old intact seedlings were supplied with the amino acids (I mM) individually either with NO3− (0.1 or 10 mM) or roots were pretreated with the amino acids and then supplied with NO3− only. Nitrate uptake was determined by following NO3− depletion from the uptake solution containing 0.1 mM NO3−. All the amino acids inhibited the increase in NO3− uptake similarly (50–60%) when the roots were supplied with 0.1 mM NO3−. Pretreatment with glutamic and aspartic acids was more inhibitory (70–80%) than with glutamine and asparagine (30%). The amino acids partially inhibited (35%) the induction of NRA in roots supplied with 0.1 mM NO3−; however, no inhibition occurred at 10 mM NO3−. Likewise, pretreatment with glutamic or aspartic acid inhibited the induction of NRA at 0.1 mM NO3− but not at 10 mM NO3−. In contrast, pretreatment with glutamine or asparagine had no effect on the subsequent induction of NRA, even at 0.1 mM NO3−. The results suggest that, at low NO3− supply, the inhibition of induction of NRA by the amino acids is a result of the lack of substrate availability due to inhibition of the NO3− uptake system." @default.
- W2122931818 created "2016-06-24" @default.
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- W2122931818 date "2001-01-01" @default.
- W2122931818 modified "2023-10-11" @default.
- W2122931818 title "Differential effect of amino acids on nitrate uptake and reduction systems in barley roots" @default.
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- W2122931818 doi "https://doi.org/10.1016/s0168-9452(00)00391-5" @default.
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