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Japonica  rice is widely planted in north-eastern China because of its superior food quality and stable grain yields. Nitrogen (N) is an essential element for rice growth, and development and its availability directly impacts on rice yields. The knowledge of N uptake and its utilization characteristics in  japonica  are thus important areas of research. Three  japonica  rice cultivars, SN265, SN1401, and SN9816, which are planted across large areas of north-eastern China, were used here to evaluate the uptake and utilization along the life cycle of both ammonium(   N   H  4  +    )and nitrate(   N   O  3  −    )in hydroponically grown plants. The plants were grown in one of three different solutions with varyingN   H  4  +:    N   O  3  −ratios: 1:0, 0:1, and 1:1 (The total N content was 40 mg L −1  for each treatment). At the tillering stage, when onlyN   O  3  −was provided, lower rates of N uptake and enzyme activities of three rice plants resulted in reduced tiller numbers. During the reproductive stage, theN   H  4  +and(   N   H  4  +    )uptake rates in SN1401 were consistently maintained at high levels, whereas the rates in SN265 and SN9816 were significantly lower, across all three treatments. At the booting stage, when onlyN   O  3  −was provided, SN1401 plants had significantly higher expression levels of  OsNRT2.1  and  OsNRT2.2 , higher activity of nitrate reductase in the roots, and higher activity levels of glutamine synthetase and glutamate synthase in the leaves, compared with the SN265 and SN9816 plants. The higher enzyme activity was beneficial to the secondary assimilation of N, which ultimately promoted panicle development in SN1401. Consequently, the grain yield per plant of SN1401 was the highest with solutions of bothN   H  4  +andN   O  3  −. These results indicate that selecting a rice cultivar with higher utilization ofN   O  3  −is beneficial for increasing the number of grains per panicle, grain yield, and N use efficiency.

Differential Uptake and Utilization of Two Forms of Nitrogen in Japonica Rice Cultivars From North-Eastern China