The Role of Citrulline in Nitrogen Translocation of <i>Cryptomeria japonica</i> Seedlings

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  • スギ苗の窒素転流におけるシトルリンの役割
  • スギ苗の窒素転流におけるシトルリンの役割〔英文〕
  • スギ ナエ ノ チッソ テンリュウ ニ オケル シトルリン ノ ヤクワリ エイ

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The xylem sap of Cryptomeria japonica seedlings was collected by a SCHOLANDER type pressure chamber. Various nitrogenous compounds, ammonia, nitrate, amino acids, and compounds above 50, 000 in molecular weight, were found in the xylem sap. For the xylem sap collected in May and June, nitrogen content of citrulline occupied about two thirds of total nitrogen. The xylem sap contained 15-18 amino acids, and amino acid concentration was high during the growing season but declined in the winter. In contrast, amino acid composition based on molar content was relatively constant throughout the year. Although a ratio of serine increased slightly at the dormant period of the seedlings, citrulline was always a predominant amino acid (66_??_87% of total amino acid). When L-ornithine-1-14C was applied to the root systems, several compounds in the xylem sap such as citrulline, glutamic acid, serine, and unidentified compounds showed radioactivities, but the strongest radioactivity was found in citrulline. These findings indicate that various nitrogenous compounds move with transpiration stream in the xylem and that citrulline serves as a major compound of nitrogen translocation from the root to the shoot in Crvptomeria seedlings.

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