Changes in the activities of ornithine decarboxylase, putrescine N-methyltransferase and N-methylputrescine oxidase in tobacco roots in relation to nicotine biosynthesis

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概要

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• Changes in ornithine decarboxylase, putrescine N-methyltransferase and N-methylputrescine oxidase activities in response to some treatments were investigated using hydroponically grown tobacco plants. Decapitation of shoots brought about marked elevation of the three enzyme activities, which reached their peaks 24 hr after decapitation, then declined. An excellent correlation was observed between the accumulation of nicotine and changes in the three root enzyme activities. Administration of IAA at 2.5 to 5 μM concentration significantly increased these enzyme activities in roots of decapitated plants but higher concentrations of IAA prevented the rise in enzyme activities promoted by decapitation. Nicotine strongly inhibited the rise in enzyme activities in roots of decapitated plants in all cases. The results suggest that these enzymes are under the control of a common regulatory system, in which auxin and nicotine are important components. Ornithine decarboxylase was present in all the plants examined, but putrescine N-methyltransferase and N-methylputrescine oxidase were detected only in the roots of tobacco, Datura and Atropa plants.

• 日本植物生理学会の論文

著者

• Tanabe Yoko

  The Central Research Institute Japan Monopoly Corporation

• Noguchi Masao

  The Central Research Institute Japan Monopoly Corporation

• Noguchi Masao

  The Central Research Institute Japan Monopoly Corp.

• TAMAKI EINOSUKE

  The Central Research Institute, Japan Monopoly Corporation, Nishishinagawa

• Mizusaki Shigenobu

  The Central Research Institute, Japan Monopoly Corporation

• Mizusaki Shigenobu

  The Central Research Institute Japan Monopoly Corporation

• Tamaki Einosuke

  The Central Research Institute Japan Monopoly Corporation

関連論文

• Metabolism of glutamate and γ-aminobutyrate in cultured tobacco cells
• Studies on nitrogen metabolism in tobacco plants IX. Effect of various compounds on proline biosynthesis in the green leaves
• Changes in the activities of ornithine decarboxylase, putrescine N-methyltransferase and N-methylputrescine oxidase in tobacco roots in relation to nicotine biosynthesis
• Phytochemical studies on tobacco alkaloids XIV. The occurrence and properties of putrescine N-methyltransferase in tobacco roots

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