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The Effect of Mixed Amino Acids on Nitrate Uptake and Nitrate Assimilation in Leafy Radish

이규승|Xing-Quan Liu|Young-Sun Kim
한국환경농학회 (The Korean Society Of Environmental Agriculture)|2005.09|한국환경농학회지 (Agricultural and Environmental Sciences)|제24권 제3호|pp. 245-252

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초록

Abstract

The objective of the present work was to determine the corresponding uptake and assimilation of NO3- in roots and shoots of leafy radish by applying of mixed amino acids (MAA). The amino acids used in this experiment were alanine (Ala), β-alanine (β-Ala), aspartic acid (Asp), asparagines (Asn), glutamic acid (Glu), glutamine (Gln), and glycine (Gly). Leafy radish was grown by conventional fertilization with macro- and micronutrients under controlled conditions. The 15-day-old seedlings were treated 0, 0.3 and 3.0 mM of MAA containing 5 mM NO3- in growth medium. Nitrate uptake was determined by following NO3- depletion from the uptake solution. The activity of the enzymes related to the process of NO3- reduction (NR: nitrate reductase; NiR: nitrite reductase; GS: glutamine synthetase) and the content of NO2- and NO3- were analyzed in shoots and roots. The results of this study showed that NO3- uptake was inhibited 38% with treatment of 0.3 mM of MAA. However, there was more than three times increase of NO3- uptake in 3.0 mM MAA. In addition, the enzymatic activities were positively affected by the high MAA rate. Finally, the NO3- content was increased slightly both in shoots and roots of leafy radish by MAA treatments.

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