Phospholipid and free sterol composition of hypocotyl plasma membranes of ageing mung bean seedlings

1994 ◽  
Vol 36 (5) ◽  
pp. 1177-1180 ◽  
Author(s):  
Veerle M. Stalleart ◽  
Jan M.C. Geuns
Keyword(s):  
Mung Bean ◽  
Free Sterol ◽  
Plasma Membranes ◽  
Sterol Composition

138 LIPID CHANGES IN TOMATO FRUIT MICROSOMAL MEMBRANES DURING RIPENING

HortScience ◽  
1994 ◽  
Vol 29 (5) ◽  
pp. 448d-448
Author(s):  
Bruce D. Whitaker
Keyword(s):  
Fatty Acid Composition ◽  
Fatty Acid ◽  
Physical Properties ◽  
Free Sterol ◽  
Tomato Fruit ◽  
Sterol Composition ◽  
Steryl Glycoside ◽  
Microsomal Membranes ◽  
Fruit Pericarp ◽  
Total Membrane

A previous study of lipids from pericarp tissue of tomato fruit ranging from mature-green to red-ripe showed a large increase in total sterols accompanied by dramatic changes in sterol composition and conjugation with ripening. This study was conducted to determine whether similar changes occur in microsomal membranes derived from tomato fruit pericarp. Acylated steryl glycoside (ASG), the predominant steryl lipid, declined during ripening, with increases in steryl glycoside (SG) and free sterol (FS). Only minor changes in fatty acid composition were associated with the drop in ASG. The stigmasterol:sitosterol ratio increased throughout ripening, but much more in Fs than in SG or ASG. The ratio of FS to phospholipid (PL) increased with ripening. However, FS was never greater than 10 percent of the total membrane sterol (TMS), and TMS:PL actually declined over the middle stages of ripening. It is not known why tomato tissues maintain such high levels of ASG and SG, but sterol conjugation is thought to regulate the physical properties of cell membranes.

Senescence of oat leaves: changes in the free sterol composition and enzyme activities of the plasma membrane

Plant Science ◽  
1991 ◽  
Vol 79 (1) ◽  
pp. 3-11 ◽  
Author(s):  
Mireille Venken ◽  
Han Asard ◽  
Jan M.C. Geuns ◽  
Roland Caubergs ◽  
Jan A. De Greef
Keyword(s):  
Plasma Membrane ◽  
Enzyme Activities ◽  
Free Sterol ◽  
Sterol Composition

Lipid and Sterol Composition of Plasma Membranes Isolated from Stele and Cortex of Maize Roots

1993 ◽  
Vol 44 (5) ◽  
pp. 991-994 ◽  
Author(s):  
D. S. C. COWAN ◽  
D. T. COOKE ◽  
D. T. CLARKSON ◽  
J. L. HALL
Keyword(s):  
Plasma Membranes ◽  
Sterol Composition ◽  
Maize Roots
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