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Plant and Cell Physiology, 1977, Vol. 18, No. 2 353-359
© 1977

Article

Distribution and change in the contents of allantoin and allantoic acid1 in developing nodulating and non-nodulatng soybean plants

Tetsuo Matsumoto, Michihiko Yatazawa and Yukio Yamamoto

Department of Agricultural Chemistry, Faculty of Agriculture, Nagoya University Nagoya 464, Japan

Distribution and change in contents of allantoin1 in each organ of nodulating variety, A62-1, and non-nodulating variety, A62-2, of soybean plants were measured over the growth period, and the physiological significance of allantoin in soybean plants is discussed.

Allantoin in the cotyledons of both varieties increased and then decreased in the germination stage. The allantoin level in stems, roots and nodules of A62-1 was raised with the growth and attained a maximum at the green pod stage and then decreased. On the other hand, those organs of A62-2 accumulated little allantoin over the growth period. The allantoin level in the stems of A62-1 was the highest compared with other organs. In the leaves of A62-1, the level was higher in the developing leaves than lower mature leaves. The level decreased just before the end of leaf development and became trace in the lower fully developed leaves. The allantoin level in the pods of A62-1 during the young stage was fairly high; whereas that of A62-2 was low but significant, and then decreased with maturing. The dry seeds in both varieties showed low levels.

Allantoin was concluded to be accumulated in roots and stems of developing soybean plants bearing nodules and then decreased in the stage of seed formation.

1 In this article the sum of allantoin and allantoic acid is measured. Therefore, the expression "allantoin" in the text and abstract includes allantoic acid.

(Received August 19, 1976; )
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