UPTAKE AND DISTRIBUTION OF COMBINED NITROGEN AND ITS INCORPORATION INTO SEEDS OF NODULATED SOYBEAN PLANTS AS REVEALED BY ^<15>N STUDIES

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Pot experiments were carried out with soybean plants grown in N-free solution and supplied with NO_3^- or NH_4^+ before ^<15>N administration, in order to study the uptake, distribution, and redistribution of absorbed nitrogen. To determine the utilization and incorporation of combined nitrogen in the seed yield, as influenced by the N form and application time, another series of experiments was conducted in which plants were grown in N-free solution before ^<15>N feeding at pod setting (P.S.) or initial pod filling (I.P.F.), as ^<15>NO_3^- or ^<15>NH_4^+. By comparing the nitrate-treated plants (Nt-plant) with the ammonium ones (Am-plant), and P.S. with I.P.F., the following results were obtained. 1) Nt-plants accumulated higher amounts of dry matter in different plant parts, particularly the pods which proved to be an active sink for the newly metabolized nitrate nitrogen. 2) Both the ^<15>N abundance and ^<15>N incorporation in the whole plant were much higher for Nt-plants, and the same was true for different plant parts except the nodules. 3) A large portion of the root share of ^<15>N was redistributed to the top parts in Nt-plants, but the same was not true for Am-plants which distributed a higher percent of the absorbed N in their nodules. 4) Irrespective of the N form, the ^<15>N abundance in different plant parts after direct distribution obeyed the order : roots>stems>leaves>pods>nodules. 5) Application of labeled combined nitrogen at P.S. resulted in a higher ^<15>N abundance and labeled N content in the seeds. 6) The labeled N content in the seeds per plant treated with nitrate was higher, but the same was not true with respect to the concentration. 7) P.S. application gave a higher seed yield, number of pods, and protein content in the seeds per plant. Nt-plants showed the higher seed yield, number of seeds per pod, and protein content per plant seed. The absorbed nitrogen percent in the total N was correlated with the seed yield.
社団法人日本土壌肥料学会の論文

UPTAKE AND DISTRIBUTION OF COMBINED NITROGEN AND ITS INCORPORATION INTO SEEDS OF NODULATED SOYBEAN PLANTS AS REVEALED BY ^<15>N STUDIES

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