Plastid Andmicrosomal Membrane Fractions from Pericarp Tissue Were Analysed at Harvest Andafter Four or 12 Days of Storage. After 12 Days at Either 15° or 2°, the Ratioof Phospholipids (Pl) to Protein In Microsomes Declined, With a Concomitantincrease In the Ratios of Total Membrane Sterols (Tms) and Cerebrosides (Cb) Topl. the Tms:Pl and Cb:Pl Ratios Also Increased In Crude Plastid Fractions. Inboth Microsomes and Plastids, Free Sterols (Fs) Increased More at 2° Than At15°, and Hence Accounted For a Larger Percentage of the Tms (Fs + Acylatedsteryl Glycosides + Steryl Glycosides). the Ratio of Stigmasterol to Sitosterolin All Steryl Lipids, But Particularly In Fs, Increased More at 15° Than at 2°.The Unsaturation Index of Fatty Acids In Pl and Galactolipids Generallyincreased Slightly During Storage at Both 15° and 2°. the Ratio of Phosphatidylethanolamineto Phosphatidylcholine Increased In Both Membrane Fractions at Bothtemperatures. In Plastids, the Ratio of Mono- to Digalactosyldiacylglycerolsdeclined Substantially at 2° But Not at 15°. Plastids Andmicrosomal Membranes Were Isolated from Pericarp Tissue of Mature-Green Andred-Ripe Bell Pepper (Capsicum Annuum L.) Fruit Harvested from Greenhouse- and Field-Grown Plants. the Lipidcomposition of These Membrane Fractions Changed Much More With Ripening Offield-Grown Than Greenhouse-Grown Fruit. Also, the Phospholipid (Pl), Freesterol (Fs), Steryl Glycoside (Sg), and Acylated Steryl Glycoside (Asg) Contentof Microsomes and Pla ...