Metabolism and Translocation of Gibberellins in the Seedlings of Pharbitis nil(II). Photoperiodic Effects on Metabolism and Translocation of Gibberellins Applied to Cotyledons

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概要

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• We investigated the metabolism and translocation of two gibberellins (GAs), [^3H]GA_<20> and [^3H]GA_1, which were applied at low concentration to the cotyledons of Pharbitis nil (cv. Violet). Seedlings were grown under three different photoperiodic conditions: continuous light (CL-CL), continuous light followed by short day conditions (CL-DT) and long day conditions followed by short day conditions (DT-DT). Translocation of the applied [^3H]GAs from cotyledons to hypocotyls was promoted by DT for all GAs examined. While the conversion of the translocated [^3H]GA_1 to [^3H]GA_8 and its conjugates was rapid in hypocotyl, the conversion of translocated [^3H]GA_<20> to [^3H]GA_<29> Was slow. Radioactivity in epicotyls was detected much more rapidly on application of [^3H]GA_<20> than of [^3H]GA_1 under all pho-toperiodic conditions. The [^3H]GA_<20> was translocated from cotyledons to epicotyls either un-metabolized or partly converted to [^3H]GA_1, [^3H]GA_8 and [^3H]GA_<29> and their conjugates. The conversion of [^3H]GA_<20> to [^3H]GA_1 in the epicotyl was more rapid under CL-CL conditions. This result is consistent with the higher level of endogenous GA_1 existing in epicotyls under CL-DT than DT-DT conditions. However, when [^3H]GA_1 was applied to the cotyledon, only small amounts of [^3H]GA_8 and its conjugates were detected in the epicotyl regardless of the photoperiodic conditions. This result may suggest that the translocation and metabolism of [^3H]GA_<20> from cotyledons to epicotyl was faster under CL-CL than DT-DT conditions and may correlate with the increased epicotyl elongation of GA_<20> treated plants under CL-DT than DT-DT conditions.

• 日本植物生理学会の論文

著者

• MUROFUSHI Noboru

  Faculty of Bioresource Sciences, Akita Prefectural University

• YAMAGUCHI Isomaro

  Department of Applied Biological Chemistry, The University of Tokyo

• MUROFUSHI Noboru

  Department of Biotechnology, Akita Prefectural University

• Maejima Noboru

  Department Of Biotechnology Akita Prefectural University

• YANG Young-Yell

  Plant Science Center, RIKEN

• Yamaguchi Isomaro

  Department Of Applied Biological Chemistry The University Of Tokyo

• Murofushi Noboru

  Department Of Agricultural Chemistry The University Of Tokyo

• Yamaguchi Isomaro

  Department Of Agricultural Chemistry Faculty Of Agricultural Science University Of Tokyo

• Yamaguchi I

  Department Of Applied Biological Chemistry University Of Tokyo

• Yang Young-yell

  Plant Science Center Riken

• Yang Young-Yell

  Department of Agricultural Chemistry, The University of Tokyo

• Yamaguchi Isomaro

  Dept. Appl. Biol. Chem. Tokyo Univ.

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