Polar and Neutral Lipid Changes in Spinach Leaves with Ozone Fumigation : Triacylglycerol Synthesis from Polar Lipids
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概要
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When mature spinach (Spinacia oleracea L. cv. New Asia) plants were continuously fumigated with 0.5 ppm (v/v) ozone, the total fatty acids in the leaf lipids remained unchanged in both content and composition during the initial 8 h, but thereafter they, especially hexadecatrienoic acid (16:3) and a-linolenic acid (18:3), began to decrease with marked accumulation of malondialdehyde, indicating fatty acid peroxidation. During the first 6 h, fatty acids in polar lipids decreased to 68% of their initial level, and most were recovered in the neutral lipid fraction. Among the polar lipids, mono-galactosyl diacylglycerol (MGDG), digalactosyl diacylglycerol (DGDG) and phosphatidylcholine (PC) decreased whereas sulfoquinovosyl diacylglycerol, phosphatidyl-glycerol (PG), phosphatidylethanolamine and phosphatidylinositol were stable during 6 h of ozone fumigation. Phosphatidic acid (PA) increased 3.4 times during the same period. Among the neutral lipids, triacylglycerol (TG) and 1,2-diacylglycerol (1,2-DG) increased markedly with ozone fumigation. The constituent fatty acids of 16:3, oleic acid (18:1), linoleic acid (18:2) and 18:3 increased markedly in TG and 1,2-DG within 6 h of ozone fumigation, whereas 3-trans-hexadecenoic acid (16:1), 18:1, 18:2 and 18:3 increased in PA. Since 16:3 is specific to MGDG and DGDG, and 18:1 and 18:2 to PC among the glycerolipids mainly reduced by ozone, the results suggest that the acyl moieties of the galactolipids were converted to TG via 1,2-DG, and those of PC to TG through PA and 1,2-DG. The appearance of 16:1 in PA indicates that a small amount of PG, specifically acylated with 16:1, was degraded to PA by ozone fumigation.
- 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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Sakaki T
National Inst. Environmental Studies Ibaraki Jpn
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Yamada M
Kobe Univ. Kobe Jpn
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Kondo Noriaki
Division Of Environmental Biology The National Institute For Environmental Studies
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Ohnishi J
Saitama Univ. Urawaw Jpn
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Ohnishi Jun-ichi
Department Of Biochemistry Faculty Of Science Saitama University
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Kondo Noriaki
Division Of Biosciences Graduate School Of Sciences And Engineering Teikyo University Of Science And
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Yamada M
Dept. Biol. Fac. Sci. Kobe Univ.
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Sakai Takeshi
Division of Environmental Biology, The National Institute for Environmental Studies
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Yamada Mitsuhiro
Departmellt Of Biology C:ollegc Of Gencral Educatioll Universsity Of Tokyo
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Ohnishi Jun-ichi
Department Of Biochemistry And Molecular Biology Faculty Of Science Saitama University
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