Uptake, Assimilation and Translocation of Nitrogen by Crops

Japan Agricultural Research Quarterly
ISSN 00213551
NII recode ID (NCID) AA0068709X
Full text

Nitrogen metabolism in some selected upland crops was investigated using a stable isotope, 15N, as a tracer. An optical emission spectrometer as well as a mass spectrometer employed for the investigations made great advance in the detailed analyses. Characteristics of nitrate and ammonium uptake by roots and foliar uptake of nitrogen dioxide (an air pollutant) were clearly identified. The kinetic studies using 15N suggested that all the inorganic nitrogen be mainly assimilated into glutamine (particularly into amide), followed by transference to other amino acids and proteins in both the roots and shoots. Nitrate was partly reduced in roots and shoots, but largely kept in storage nitrate pools before reduction. Significant transfer of nitrogen from mature leaves to growing leaves and tops as well as to roots was demonstrated directly by 15N and by a compartment analysis.

Date of issued
Creator Tadakatsu YONEYAMA
Available Online
NII resource type vocabulary Journal Article
Volume 25
Issue 2
spage 75
epage 82
Language eng

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