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KMID : 0368419810240030159
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Journal of Plant Biology
1981 Volume.24 No. 3 p.159 ~ p.167
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Nitrate Reductase Activity and Nitrate Uptake in Rice Seedling Root
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Chang Nam-Kee
Jung Gu-Hung
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Abstract
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The nitrate reductase activity (NRA) and nitrate uptake were studied in roots of rice seedling (Oryza sativa L. IR-667). The exponentially increasing curves of NRA and nitrate uptake suggested an induction by the external nitrate. NRA and nitrate, uptake were, repressed in phosphate buffer solution (pH7.0). The in vivo NRA with NO^-_3 was increased under the presence of ammonium ion but nitrate uptake was inhibited. As compared with the roots of intact rice, the excised roots generally showed low values of in vivo NRA. Seedlings taking up nitrate for 17 hr had a storage pool which supplied nitrate to nitrate reduction site.
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