Abstract
Acylmonogalactosyldiglyceride (acyl-MGDG) was isolated from leaf homogenates of tobacco, and its structure was determined to be 1, 2-di-O-acyl-3-O-(6-O-acyl-β-D-galactopyranosyl)-sn-glycerol by decomposition analyses, PMR, CMR and GC-MS. This compound had an identical structure with that found in disrupted spinach leaves, except for a significant difference in fatty acid composition. This compound was detected in disrupted leaves of tobacco but was not found in normal green, senescent and cured leaves. Monogalactosyldiglyceride and digalactosyldiglyceride decreased abruptly during incubation of leaf homogenates, which was accompanied by the rapid formation of acyl-MGDG.
