A Study of Absorption and Accumulation of Amino Acids in a Rice Seedling, Using Doubly Labeled (¹⁵N and ¹³C) Glutamine and Valine

Abstract

We studied the absorption and distribution of two kinds of amino acid, glutamine and valine, in a rice seedling to study the difference of availability of organic nutrients. When doubly labeled (¹⁵N and ¹³C) amino acids were applied, absorption and accumulation amount of ¹⁵N in the rice seedling was the same but especially, in the case of glutamine, accumulation amount of ¹³C in the seedling was lower than that of absorbed amount. These results suggested that a part of amino acids assimilated in the plant was lost as carbon dioxide through respiration and the assimilation of glutamine occurred more smoothly than that of valine.