PHYSIOLOGICAL RESPONSES OF LIGHT-GROWN CUCUMBER HYPOCOTYLS TO HELMINTHOSPOROL AND ITS DERIVATIVES
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概要
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Helminthosporol, helminthosporic acid and dihydrohelminthosporic acid stimulated hypocotyl elongation of light-grown cucumber seedlings. The relative activities of the three compounds were in the order H_2-H-acid> H-acid> H-ol. The higher the dosage, the longer the promotion of the hypocotyl elongation lasted. The response of the hypocotyl to H-acid depended on the presence of cotyledons. As the amount of the cotyledon attached to the hypocotyl was reduced, the response decreased. When IAA-oxidase was estimated as IAA metabolized per dry weight of the hypocotyl, there was an inverse relationship between IAA-oxidase activity and H-ol-induced elongation of the hypocotyl. However, there was no difference between control and H-ol treated materials when IAA metabolized per plant was compared. It is unlikely that the mechanism of H-ol action is closely related to IAA-oxidase activity of the plant.
- 日本植物生理学会の論文
著者
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Tamura Saburo
Department Of Agricultural Chemistry Faculty Of Agriculture The University Of Tokyo
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Katsumi Masayuki
Department Of Biology International Christian University
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Sakurai Akira
Department Of Agricultural Chemistry University Of Tokyo
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Sakurai Akira
Department Of Aeronautical Engineering Kyushu University
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