Sterols and phytyl esters of Arabidopsis thaliana under normal and chilling temperatures
1993
Patterson, G.W. | Hugly, S. | Harrison, D.
Sitosterol was the principal sterol in Arabidopsis thaliana with campesterol being second most abundant. Small amounts of cholesterol, stigmasterol, campestanol, brassicasterol, stigmastanol, fucosterol and isofucosterol were identified by GC-MS. Free sterol made up 88% of the total sterol, but both esters and glycosides were detected. No significant changes in sterol composition were noted in Arabidopsis thaliana or in mutant PM-11 in response to chilling temperatures. Phytyl esters accumulated in mutant PM-11 after two or more days of chilling temperature, but did not accumulate in the wild type under chilling conditions. The fatty acids in these phytyl esters are atypical of the total fatty acids of Arabidopsis and are dominated by short chain, saturated fatty acids and hexadecatrienoic acid (16:3). The accumulation of these phytyl esters would be consistent with chlorophyll degradation, inhibition of late stages in fatty acid biosynthesis and degradation of the chloroplast.
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