Variations in the Natural Abundance of ^<15>N in Nitrogenous Fractions of Komatsuna Plants Supplied with Nitrate
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概要
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Komatsuna (Brassica campestris L. var. rapa) plants were grown hydroponically under various conditions with respect to the supply of nitrate, and the variations in levels of natural ^<15>N abundance (δ^<15>N) in nitrogenous fractions of leaf blades, petioles plus midribs, and roots in these plants were analyzed. The fractionation of nitrogen isotopes during uptake of nitrate was null irrespective of the concentrations of nitrate in the culture medium. The roots had lower δ^<15>N values than that in the nitrate applied to plants. The nitrate in the three tissues examined had higher δ^<15>N values than that in the nitrate applied: the values were highest in the leaf blades which were presumed to have highest activities in terms of reduction of nitrate. In contrast, the amino acids and residual fractions had lower δ^<15>N values than those in the nitrate applied. These results suggest that reduction of nitrate is a critical step in the fractionation of nitrogen isotopes in plant tissues in vivo.
- 日本植物生理学会の論文
著者
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Yoneyama Tadakatsu
Department Of Agricultural Chemistry University Of Tokyo:(present Address)division Of Environmental
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Kaneko Akira
Department Of Gastroenterology Osaka National Hospital
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Kaneko Akira
Department Of Gastroenterology And Hepatology Osaka University Graduate School Of Medicine
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Kaneko Akira
Department Of Agricultrural Chemistry And Department Of Forestry Faculty Of Agriculture Ehime Univer
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Yoneyama Tadakatsu
Department Of Agricultural Chemistry University Of Tokyo
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