Abstract
During the senescence of photosynthetic tissues, the level of chloroplast galactolipids markedly declines. The final assembly of these lipids occurs in the plastid envelope. An investigation was made to determine the activity of plastid envelope UDP-galactose-diglyceride galactosyl transferase (galactosyl transferase), which makes this final assembly, in envelopes from greening and senescing soybean cotyledons. When the tissue greened there was an increase in the galactosyl transferase activity. As the tissue senesced there was a decline of the activity of this enzyme as well as a decrease in cotyledon chlorophyll, nucleic acid, protein, mono- and di-galactosyl diacylglycerols, phosphatidyl glycerol, phosphatidyl ethanolamine and phosphatidyl choline levels. It is suggested that the decreased plastid envelope galactosyl transferase activity in senescent tissue may explain, at least in part, the decreased levels of mono- and digalactosyl diacylglycerols in these tissues.
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