大豆のチッソ代謝に関する研究 : 第2報植物体各部に移行した標識および非標識チッソの割合

概要

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Transport of newly absorbed ^<15>N and previously accumulated ^<14>N in young soybean plants was examined following the application of nitrate- ^<15>N to the root medium. During a 12-hour absorption period the roots exported both ^<15>N and ^<14>N to the shoots in the ratio of 51 : 49 for Experiment 1 and 82 : 18 for Experiment 2. A higher ^<15>N ratio found in the Experiment 2 may be attributed to the aerated condition of the root medium, while in the Experiment 1 this condition was omitted. The proportion of ^<15>N and ^<14>N in the nitrogen transported to apical growing region of the stem showed a marked difference from that of the nitrogen exported from the roots with a considerably lesser ^<15>N ratio to ^<14>N such as 16 : 84 for Experiment 1 and 30 : 70 for Experiment 2. The total amount of nitrogen entering leaves during the experiment was estimated from the leaves with the "ringing" treatment to their petioles. It was found that the nitrogen transported into leaves also consisted of ^<15>N and ^<14>N components, and their ratios were intermediate between those of the roots and those of the apical growing regions. When comparison was made among the leaves of different ages, the percentage of ^<14>N increased as the age decreased. Thus, it may be said that the relative content of ^<14>N in the translocating nitrogen increased as the nitrogen moved through the stem toward the apex.
日本作物学会の論文
1973-09-30