Effect of nitrate pulses on the nitrate-uptake rate,synthesis of mRNA coding for nitrate reductase,and nitrate-reductase activity in the roots of barley seedlings |
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Authors: | Rudolf Tischner Barbara Waldeck Sham S Goyal William D Rains |
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Institution: | (1) Pflanzenphysiologisches Institut, University of Göttingen, Untere Karspüle 2, W-3400 Göttingen, Germany;(2) Department of Agronomy and Range Sciences, University of California at Davis, 95616 Davis, CA, USA |
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Abstract: | Using pulses of nitrate, instead of the permanent presence of external nitrate, to induce the nitrate-assimilating system in Hordeum vulgare L., we demonstrated that nitrate can be considered as a trigger or signal for the induction of nitrate uptake, the appearance of nitratereductase activity and the synthesis of mRNA coding for nitrate reductase. Nitrate pulses stimulated the initial rate of nitrate uptake, even after subsequent cultivation in N-free medium, and resulted in a higher acceleration of the uptake rate in the presence of nitrate than in its absence.Abbreviations NR
nitrate reductase |
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Keywords: | Hordeum Nitrate pulse Nitrate uptake (induction) Nitrate reductase mRNA |
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