Abstract
The acyl moiety of acyl-CoAs was transferred predominantly by avocado mesocarp microsomes to microsomal polar lipids and always to position 2; only a small portion of the acyl-ACP (acyl-acyl carrier protein) transferase activity resulted in polar lipid formation. In contrast, triacylglycerol was formed from either substrate but insertion occurred only at position 3; acyl-ACP transferase activity was similar for all acyl-ACPs tested. The acyl moiety of acyl-CoAs but not acyl-ACPs was transferred by spinach grana to grana polar lipids and insertion occurred only at position 2. No increase in transferase activity was observed in grana or microsomes in the presence of l-α-glycerophosphate, phosphatidic acid, l-α-glycerophosphorylcholine, lysolecithin or diolein. The significance of these observations with respect to plant lipid metabolism is discussed.
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