General Metabolic Changes in Leaf Lipeds in Response to Ozone : ENVIRONMENTAL AND STRESS RESPONSES
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概要
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Of eight species of higher plants examined, Lettuce was the most resistant to ozone. Lettuce leaves showed no visible changes while in other species visible injuries were apparent after plants had been exposed to 0.5 μl liter^<-1> ozone in the light for 6 h and then kept in the light for a further 20 h. Analysis of leaf lipids immediately after 4-6 h of treatment with ozone revealed decreases in levels of monogalactosyldiacylglycerol (MGDG) and increases in levels of triacylglycerol (TG) in all plants including lettuce, but the extent of the changes varied among the plant species. The fatty acids esterified to TG in ozone-treated leaves were mainly α-linolenic acid (18:3) in 18:3 plants and hexadecatrienoic acid (16:3) and 1 8:3 in 16:3 plants, and these are the predominant fatty acids normally esterified to MGDG in the respective plant groups. Since levels of these fatty acid species also increased in diacylglycerol (DG) and free fatty acid (FFA) fractions, MGDG seems to have been metabolized to TG via FFA and DG in all tested plants in response to ozone. The level of 18:3 increased markedly at the sn-2 position of phosphatidylcholine (PC) as a result of ozone treatment, suggesting that 18:3 hydrolyzed from MGDG was partially incorporated into PC by an acyl exchange reaction.
- 日本植物生理学会の論文
著者
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SAKAKI Takeshi
Department of Bioscience and Technology, School of Engineering, Hokkaido Tokai University
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Sakaki T
Department Of Bioscience And Technology School Of Engineering Hokkaido Tokai University
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Sakaki Takeshi
Department Of Bioscience And Technology School Of Engineering Hokkaido Tokai University
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Tanaka Kiyoshi
Environmental Biology Division 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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SAKAKI Takeshi
Department of Agricultural Chemistry, Faculty of Agriculture, Hokkaido University
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