Abstract
Summary The chemical transformation of thylakoid acyl lipids in isolated pea ( Pisum satium L.) chloroplasts is shown to be accompanied by the formation of near-thylakoid lipid drops, whose internal structure appears as tubular aggregates characteristic for the phase separation of non-bilayer forming lipids. This correlation is revealed for chloroplasts isolated at pH 4.6 and for chloroplasts stored for 10-12 days at + 5 °. In chloroplasts stored for 10 days at + 2 °, chemical changes are minimal, and lipid drops are absent. In chloroplasts isolated at pH 4.6, a decrease in the volume and an increase in density take place, due to a reduction in the length of agranal thylakoids and the free space between thylakoids.
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