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Elevated atmospheric CO 2 concentration and diurnal cycle induce changes in lipid composition in Arabidopsis thaliana
Author(s) -
Ekman Åsa,
Bülow Leif,
Stymne Sten
Publication year - 2007
Publication title -
new phytologist
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 3.742
H-Index - 244
eISSN - 1469-8137
pISSN - 0028-646X
DOI - 10.1111/j.1469-8137.2007.02027.x
Subject(s) - phosphatidylethanolamine , phosphatidylcholine , phosphatidylglycerol , chemistry , arabidopsis thaliana , composition (language) , fatty acid , lipid metabolism , botany , photoperiodism , photosynthesis , food science , horticulture , biology , biochemistry , phospholipid , linguistics , philosophy , mutant , gene , membrane
Summary• Few studies regarding the effects of elevated atmospheric CO 2 concentrations on plant lipid metabolism have been carried out. Here, the effects of elevated CO 2 concentration on lipid composition in mature seeds and in leaves during the diurnal cycle of Arabidopsis thaliana were investigated. • Plants were grown in controlled climate chambers at elevated (800 ppm) and ambient CO 2 concentrations. Lipids were extracted and characterized using thin layer chromatography (TLC) and gas liquid chromatography. • The fatty acid profile of total leaf lipids showed large diurnal variations. However, the elevated CO 2 concentration did not induce any significant differences in the diurnal pattern compared with the ambient concentration. The major chloroplast lipids monogalactosyldiacylglycerol (MGDG) and phosphatidylglycerol (PG) were decreased at elevated CO 2 in favour of phosphatidylcholine (PC) and phosphatidylethanolamine (PE). Elevated CO 2 produced a 25% lower ratio of 16:1 trans to 16:0 in PG compared with the ambient concentration. With good nutrient supply, growth at elevated CO 2 did not significantly affect single seed weight, total seed mass, oil yield per seed, or the fatty acid profile of the seeds. • This study has shown that elevated CO 2 induced changes in leaf lipid composition in A. thaliana , whereas seed lipids were unaffected.