Takashi Tsutsumi

Hokkaido University, Sapporo, Hokkaidō, Japan

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Publications (2)7.17 Total impact

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    ABSTRACT: Theobroxide is an epoxy cyclohexene compound isolated from the culture filtrate of the fungus Lasiodiplodia theobromae that induces potato microtuber formation in vitro (Nakamori and others 1994). When sprayed on potato (Solanum tuberosum L.) and morning glory (Pharbitis nil) plants, which require short days to induce tubers and flower buds, respectively, potato plants kept in noninducing conditions (long days) produced tubers. Theobroxide spray treatment also produced flower buds in morning glory plants kept under noninducing conditions (long days). Furthermore, under inducing conditions (short days), the number of flowers of seedlings sprayed with theobroxide was about 1.5 times that of controls.
    Journal of Plant Growth Regulation 01/2000; 19(4):457-461. DOI:10.1007/s003440000037 · 2.24 Impact Factor
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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.
    Plant and Cell Physiology 07/1996; 37(5). DOI:10.1093/oxfordjournals.pcp.a028985 · 4.93 Impact Factor