Amino Acid Pools in Herbaceous Plants at the wintering Stage and at the Beginning of Growth

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Free amino acids in 40 herbaceous perennial plants were analyzed under natural conditions. From the major amino acid content at the wintering stage, the pools were separated into the following five types: 1) a group which accumulated arginine (20 plants out of 40); 2) a group which accumulated arginine and proline (9 plants); 3) a group which accumulated glutamate and glutamine (3 plants); 4) a group which accumulated asparagine (4 plants); and 5) a group which accumulated proline (4 plants). Changes in the amino acid pools in the plants occurred under snow during wintering for about five months. Particularly, asparagine was no longer the major amino acid in the group which had accumulated it in fall. There was a tendency for the glutamine content to increase, suggesting that NH_3 is utilized for the synthesis of the amide. Also, the relative concentrations of almost all the free amino acids increased several-fold, which was indicative of the occurrence of biosynthetic processes of general amino acids during wintering. As the mobile fractions of stored nitrogen, the amino acids appeared to contribute to the initial stage of rapid growth in early spring.
日本植物生理学会の論文