Biosynthesis of Abscisic Acid by the Direct Pathway via Ionylideneethane in a Fungus, Cercospora cruenta
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概要
- 論文の詳細を見る
We examined the biosynthetic pathway of abscisic acid (ABA) after isopentenyl diphosphate in a fungus, Cercospora cruenta. All oxygen atoms at C-1, -1, -1′, and -4′ of ABA produced by this fungus were labeled with 18O from 18O2. The fungus did not produce the 9Z-carotenoid possessing γ-ring that is likely a precursor for the carotenoid pathway, but produced new sesquiterpenoids, 2E,4E-γ-ionylideneethane and 2Z,4E-γ-ionylideneethane, along with 2E,4E,6E-allofarnesene. The fungus converted these sesquiterpenoids labeled with 13C to ABA, and the incorporation ratio of 2Z,4E-γ-ionylideneethane was higher than that of 2E,4E-γ-ionylideneethane. From these results, we concluded that C. cruenta biosynthesized ABA by the direct pathway via oxidation of ionylideneethane with molecular oxygen following cyclization of allofarnesene. This direct pathway via ionylideneethane in the fungus is consistent with that in Botrytis cinerea, except for the positions of double bonds in the rings of biosynthetic intermediates, suggesting that the pathway is common among ABA-producing fungi.
- 社団法人 日本農芸化学会の論文
- 2004-12-23
著者
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OHIGASHI Hajime
Division of Food Science and Biotechnology, Graduate School of Agriculture, Kyoto University
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Ohigashi H
Division Of Food Science And Biotechnology Graduate School Of Agriculture Kyoto University
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Ohigashi H
Graduate School Of Agriculture Kyoto University
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Ohigashi H
Division Of Applied Life Sciences Graduate School Of Agriculture Kyoto University
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Yoshida R
Department Of Agriculture Technology Toyama Prefectural University
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Yoshida Ryuji
Department Of Agriculture Technology Toyama Prefectural University
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Hirai Nobuhiro
International Innovation Center Kyoto University
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Ohigashi Hajime
Division Of Applied Life Sciences Graduate School Of Agriculture Kyoto University
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INOMATA Masahiro
Division of Food Science and Biotechnology, Graduate School of Agriculture, Kyoto University
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Inomata Masahiro
Division Of Food Science And Biotechnology Graduate School Of Agriculture Kyoto University
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Hirai N
International Innovation Center Kyoto University
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Ohigashi Hajime
Div. Of Food Sci. And Biotechnology Graduate School Of Agriculture Kyoto Univ.
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