水稲の窒素代謝に関する研究 : II 重窒素を利用せる研究(其4)

概要

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Rice plants were cultured with nutrient solution until their panicles begin to grow, then supplied the isotopically labelled (N^<15>H_4)_2SO_4 (7.92 atom per cent N^<15> excess). Plants were harvested after 12 hrs., 24hrs., 48 hrs., and at the begining of the heading and at full maturity. Various nitrogenous fractions in water soluble non-protein and in protein were then analyzed for their concentration of N^<15>. Rapid absorption, translocation, and utilization of N^<15> were found to have occured after 12,24 and 48 hrs. The high concentrations of N^<15> of various nitrogenous fractions in water soluble non-protein indicated their synthetic activities, especially those of ami des and dicarboxylic amino acids were predominant. Of the compounds isolated from protein hydrolyrates, the concentrations of N^<15> of amides and dicarboxylic amino acids were high and the lowest were basic amino acids. Those tendencies were nearly always the same even the plants had been cultured under different nitrogen levels. The differences of N^<15> concentrations among the various organs or various nitrogenous fractions decreased gradually with the development of the plant growth.
社団法人日本土壌肥料学会の論文
1953-07-20