Behavior of Carbon from Asparagine, Aspartic Acid, Glutamine, and Glutamic Acid after Introduction to Flag Leaf of Rice Plant during Ripening

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L-^14C-[U]-asparagine, L[^14C-[U]-aspartic acid, L-^14C-[U]-glutamine, and L-^14C-[U]-gulutamic acid were taken up from the tip of the flag leaf at the milking stage of rice, which was grown without nitrogen application after flowering, and the behavior of ^14C was studied. The results were as follows. 1) During the 24 h period after ^14C-absorption, the respiratory loss of carbon from Ash, Asp, Gln, and Glu amounted to 36, 28, 29, and 21%, respectively. It thus appeared that amides (Ash and Gln) were consumed as respiratory substances more actively than the corresponding amino acids (Asp and Glu). 2) The carbon of Ash, Asp, Gln, and Glu was mainly distributed in serine, glycine, and threonine in the free amino acids of the flag leaf. 3) A the carbon from Asn, Asp, Gln, and Glu taken up from the flag leaf was actively metabolized, the distribution percentage of carbon of each amino acid or amide as the absorbed form into protein of the flag leaf and grains was very low. Based on the above results, it was concluded that during ripening of rice plant, when leaf protein was decomposed, the amino acids and amides were translocated to the grains, and reconstructed in the grains. There was a substantial exchange of carbon of leaf protein regardless of the form of amino acids or amides.
社団法人日本土壌肥料学会の論文