Possible Involvement of Phosphoinositide-Ca^<2+> Signaling in the Regulation of α-Amylase Expression and Germination of Rice Seed(Oryza sativa L.)

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概要

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• We have studied the effects of neomycin, a potent inhibitor of inositol phospholipid-specific phospholipase C(PLC), on the germination of rice seed and the gibberellin-induced expression of α-amylase in the aleurone layer and the scutellar tissues. It was shown that, in the absence of exogenous Ca^<2+> neomycin markedly reduced the germination speed and seedling growth of rice seeds and inhibited the gibberellin-induced expression of α-amylase in both secretory tissues. In addition, neomycin decreased the formation of inositol 1, 4, 5-trisphosphate(IP_3)in the gibberellin-treated aleurone layer and the scutellar tissues. However, the inhibitory effects on the germination speed and the expression of α-amylase activity were overcome by supplementation of Ca^<2+>. In addition, gibberellin elevated the level of IP_3, and ABA prevented the gibberellin-induced formation of IP_3, although ABA alone did not alter the IP_3 level. The expression of a membrane-bound PLC molecule in rice aleurone layer was shown to be induced by gibberellin, and the gibberellin-induced expression of PLC was markedly delayed by treatment with ABA. These results strongly suggest that the phosphoinositide-Ca^<2+> signal transduction pathway may play an important role in the gibberellin-induced expression of α-amylase molecules closely related to the germination processes of rice seed.

• 日本植物生理学会の論文

著者

• Kashem Mohammad

  Graduate School Of Science And Technology Niigata University

• ITOH Kimiko

  Department of Internal Medicine and Molecular Science, Graduate School of Medicine, Osaka University

• Itoh Kimiko

  Graduate School Of Sci. And Technol. Niigata Univ.

• Hori Hidetaka

  Graduate School of Science and Technology, Niigata University

• Mitsui Toshiaki

  Graduate School of Science and Technology, Niigata University

• Hori H

  Graduate School Of Sci. And Technol. Niigata Univ.

• Hori Hidetaka

  Laboratories Of Molecular Life Science Graduate School Of Science And Technology Niigata University

• Hori Hidetaka

  Laboratories Of Molecular Life Sciences Graduate School Of Natural Science And Technology Niigata Un

• Hori Hidetaka

  Graduate School Of Natural Science And Technology Niigata University

• Kashem Mohammad

  Laboratories of Molecular Life Sciences, Graduate School of Science and Technology, Niigata Universi

• Iwabuchi Satoru

  Laboratories of Molecular Life Sciences, Graduate School of Science and Technology, Niigata Universi

• Mitsui Toshiaki

  Laboratories of Molecular Life Sciences, Graduate School of Science and Technology, Niigata Universi

• Mitsui T

  Graduate School Of Science And Technology Niigata University

• Mitsui Toshiaki

  Laboratories Of Molecular Life Science Graduate School Of Science And Technology Niigata University

• Iwabuchi Satoru

  Graduate School of Natural Science and Technology, Niigata University

• Itoh Kimiko

  Department Of Internal Medicine And Molecular Science Graduate School Of Medicine Osaka University

• Iwabuchi Satoru

  Graduate School Of Natural Science And Technology Niigata University

• Hori Hidetaka

  Laboratories Of Plant And Mircobial Genome Control Graduate School Of Science And Technology Niigata

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