Abstract
Abstract The transport of arginine and α-aminoisobutyric acid from the cotyledon to the axis of Phaseolus lunatus L. was followed during a 4-day germination. Transport of both amino acids to the axis was slow during the first 2 days and increased rapidly during the third and fourth days of germination. Both amino acids accumulated in the axis of viable seeds. Alpha-aminoisobutyric acid was not metabolized by the cotyledon or axis, whereas arginine was rapidly fixed by both tissues into protein. Percent incorporation of arginine into protein was lower in the cotyledon than in the axis. Rapid synthesis of proteins in the cotyledon appears to limit transport and availability of amino acids to the axis. No transport or accumulation of α-aminoisobutyric acid was observed in seeds that lost germinability through accelerated aging.
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