Metabolism and Transport of [2-14C]( ) Jasmonic Acid in the Potato Plant

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Abstract
Metabolism and transport of [2-14C](±) jasmonic acid (JA) were studied using 2-week-old potato plants. Plants grown under tuber inducing conditions (short days) and non-inducing conditions (long days) were assayed 1, 5, 10, 15, 20, and 25 days after substance application. The incorporated [2-14C](±)JA was metabolized to tuberonic acid glucoside (TAG) within 2 weeks. The radioactivity of the ethanol extract from each plant part was measured. More than half of the total radioactivity was still associated with the treated leaves up to 25 days after the application of [2-14C](±)JA. In the other parts of the plants, the upper leaves contained the most total radioactivity, followed by the stems and lower leaves. Under long days no tubers were produced, and the radioactivity of the stolons was observed. In contrast, under short days tuber were produced, and the radioactivities were present in stolons and tubers. Flower buds and flowers were produced more under long days and accumulated high radioactivity. It is concluded from the combined data that JA is metabolized to TAG and transported to all parts of the plant. A high accumulation of TAG in tubers and flower buds may induce the formation of tubers and flower buds.

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