COMPARATIVE STUDIES ON THE DISTRIBUTION OF NITROGEN IN SOYBEAN PLANTS SUPPLIED WITH N_2 AND NO_3-AT THE POD FILLING STAGE
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概要
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Well modulated soybean plants were subjected to ^<15>N_2 or ^<15>NO_3^- pulse label experiments at the pod filling stage, when the vegetative organs and the pod shells were fully developed, and the seeds were growing rapidly. Immediately after 10 hr of ^<15>N_2 treatment, only 36% of the fixed ^<15>N remained in the nodules, and the rest was located as follows; roots 9%, stems 17%, leaves 18%, pod shells 10%, seeds 10%. during the 5 consecutive days of cultivation under non-labelled conditions, ^<15>N content decreased in the nodules, roots and stems, and the corresponding amount of ^<15>N was translocated to the seeds. At the end of 10 hr of NO_3^-feeding, 36% of the total ^<15>N was distributed in the roots, and 0.4% in the nodules, 17% in the stems, 36% in the leaves, 5% in the pod shells, and 5% in the seeds, respectively. During 5 days of cold chase period, ^<15>N was redistributed to seeds mainly from the insoluble fraction of roots, stems and leaves. Finally 44% of the total ^<15>NO_3^- -N absorbed was located in the seeds, and the proportion was rather higher than the percentage of total fixed ^<15>N_2-N in seeds (36%). The results of ^<15>N_2 and ^<15>NO_3^- treatments were compared and it was concluded that although both N_2-N and NO_3^- -N can be utilized for either the vegetative or the reproductive growth of soybean plants, the characteristics of pathways of N metabolism are markedly different. Some portion of N originating from N_2 was translocated directly to the pod shells and seeds, while another portion was derived from the protein degradation products of nodules or other vegetative parts. On the other hand, most of the NO_3^- -N absorbed was immediately incorporated into the proteins of roots and leaves, and subsequently N was resolubilized and redistributed to the reproductive parts.
- 社団法人日本土壌肥料学会の論文
著者
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Ohyama Takuji
Department Of Agricultural Chemistry Faculty Of Agriculture Niigata University
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Ohyama Takuji
Department Of Agricultural Chemistry Nillgata University
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