The Transcript Level of Katanin Gene is Increased Transiently in Response to Changes in Gravitational Conditions in Azuki Bean Epicotyls

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  • Soga Kouichi
    Department of Biology and Geosciences, Graduate School of Science, Osaka City University, Sumiyoshi-ku, Osaka 558-8585, Japan
  • Kotake Toshihisa
    Division of Life Science, Graduate School of Science and Engineering, Saitama University, Sakura-ku, Saitama 338-8570, Japan
  • Wakabayashi Kazuyuki
    Department of Biology and Geosciences, Graduate School of Science, Osaka City University, Sumiyoshi-ku, Osaka 558-8585, Japan
  • Kamisaka Seiichiro
    Graduate School of Science and Engineering, University of Toyama, Gofuku, Toyama 930-8555, Japan
  • Hoson Takayuki
    Department of Biology and Geosciences, Graduate School of Science, Osaka City University, Sumiyoshi-ku, Osaka 558-8585, Japan

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Development of a short and thick body by reorientation of cortical microtubules is required for the resistance of plants to the gravitational force. Katanin has microtubule-severing activity and is involved in the reorientation of cortical microtubules. Here, we investigated the effects of hypergravity produced by centrifugation on the expression of VaKTN1 gene encoding katanin. Hypergravity at 300 G increased the transcript level within 15 min, and the level reached maximum at 45 min. Then, the level was decreased and returned to the control range at 2 h. Also, the expression of VaKTN1 gene was increased transiently by removal of hypergravity stimulus. Changes in the microtubule-severing activity as a result of the modification of VaKTN1 expression in response to changes in gravitational conditions may be involved in the regulation of the orientation of cortical microtubules, leading to changes in the shape of plant body. Lanthanum and gadolinium ions, potential blockers of mechanosensitive calcium ion-permeable channels (mechanoreceptors), nullified the up-regulation of VaKTN1 gene, suggesting that mechanoreceptors are responsible for regulation by gravity of VaKTN1 expression. (c)2009 Jpn. Soc. Biol. Sci. Space; Article ID: 092301004

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