The Influence of Nicotinic Acid and Plant Hormones on Flowering in Lemna

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概要

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• Nicotinic acid induces flowering in Lemna paucicostata 151 and 381 and Lemna gibba G3 when they are grown in one tenth-strength M medium under continuous light. For L. paucicostata 151 and 381, the simultaneous addition of IAA, GA_3 or ABA to the medium leads to an inhibition of the flower-inducing effect of nicotinic acid, while zeatin leads to a further stimulation of flowering above that obtained by nicotinic acid alone. By contrast, in L. gibba G3 all four plait hormones inhibit the nicotinic acid-induced stimulation of flowering. The effect of nicotinic acid on flowering in all three plants is strongly daylength dependent when the plants are grown in half-strength Hutner's medium. Thus, nicotinic acid causes flowering in L. gibba G3 on continuous light but not on 9L:15D or 10L:14D regimes. In L. paucicostata 381 nicotinic acid has a small effect on 12L:12D regime, a large effect on a 13L:11D regime and no effect with daylengths longer than 14 hours, and in L. paucicostata 151 nicotinic acid is only effective on day lengths shorter than about 11 hours. However, in L. paucicostata 151 and 381 treatment with both nicotinic acid and zeatin results in flowering under continuous light on half-strength Hutner's medium. Nicotinic acid is present in different Lemna but its concentration does not appear to be influenced by changes in daylength. Thus, flowering clearly cannot be controlled by nicotinic acid acting alone, but the results of this study indicate that nicotinic acid could interact with other factors, possibly including one or more of the known plant hormones, to influence the flowering process in Lemna.

• 日本植物生理学会の論文

著者

• YAMAGUCHI Isomaro

  Department of Applied Biological Chemistry, The University of Tokyo

• MUROFUSHI Noboru

  Department of Biotechnology, Akita Prefectural University

• FUJIOKA Shozo

  The Institute of Physical and Chemical Research (RIKEN)

• Cleland C

  Smithsonian Environmental Research Center Maryland Usa

• Takahashi Nobutaka

  The Institute of Physical and Chemical Research

• Takimoto Atsushi

  Laboratory of Experimental Biology

• 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

• Kaihara Sumiko

  Laboratory Of Applied Botany Faculty Of Agriculture Kyoto University

• Takimoto Atsushi

  Laboratory Of Applied Botany Faculty Of Agriculture

• Yamaguchi I

  Department Of Applied Biological Chemistry University Of Tokyo

• Fujioka Shozo

  Plant Functions Laboratory The Institute Of Physical And Chemical Research (riken)

• Cleland Charles

  Smithsonian Environmental Research Center

• Kaihara Sumiko

  Department Of Agricultural Chemistry The University Of Tokyo

• Takimoto Atsushi

  Laboratory of Applied Botany, Faculty of Agriculture, Kyoto University

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