Development of Lipid Synthesis from CO_2 in Avena Leaves during Greening of Etiolated Seedlings
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概要
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The development of the lipid synthesizing system in Avena leaf sections was examined in connection with carbon fixation during the greening of etiolated seedlings under light. During the initial 2 h illumination there was a low level of CO_2 fixation by PEP carboxylation, but its products, malate and citrate, did not serve as a carbon source for lipid synthesis, although lipid synthesis from acetate had already been established. With the initiation of Calvin cycle activity after the initial 2 h illumination, lipid synthesis began, with CO_2 fixed by RuBP carboxylation serving exclusively as the carbon source. Fatty acid synthesis in the leaves during the initial 3 h illumination, unlike the fatty acid synthesis thereafter, was insensitive to thiolactomycin, an inhibitor of type 11 fatty acid synthetase contained in the plastids, and was not dependent on light, in contrast to light-dependent activity in greened leaves. The distribution of ^<14>C incorporated into lipid molecules from NaH^<14>CO_3 showed an equal ratio of ^<l4>C in fatty acid, glycerol and choline moieties of labeled phosphatidylcholine, but a denser radioactivity in the galactose moiety than in the residual moiety of mono- and di-galactosyldiacylglycerols. This suggests a regulated supply of glycerol, choline and fatty acid moieties for phosphatidylcholine synthesis, and an excess supply of galactose to diacylglycerol moiety for galactosyldiacylglycerol synthesis in Avena leaves.
- 日本植物生理学会の論文
著者
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Yamada Mitsuhiro
Department of Biology, College of General Education, University of Tokyo
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WATANABE Shin-ichiro
Department of Internal Medicine and Gastroenterology, Tokyo Women's Medical College
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Watanabe S
Tohoku Univ. Miyagi Jpn
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Watanabe Shin-ichiro
Department Of Biology University Of Tokyo
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Watanabe Shin-ichiro
Department Of Applied Physics Tokai University
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Yamada Mitsuhiro
Departmellt Of Biology C:ollegc Of Gencral Educatioll Universsity Of Tokyo
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Watanabe Shin-ichiro
Department of Applied Biological Chemistry, Faculty of Agriculture, Tohoku University:(Present)P.C. Center
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