Abstract
Changes in plastid polypeptide composition during greening of etiolated peas were investigated by two-dimensional gel electrophoresis. One hundred of the more than 250 polypeptides which could be detected upon silver staining were followed during plastid development. Thirty-nine polypeptides decreased in abundance on a per organelle basis. Twentythree of the 46 polypeptides which increased in abundance upon greening could be identified as proteins of the thylakoid membrane. The changes in proteins observed during greening of etiolated leaves corresponded largely to those observed during normal leaf expansion. The origin of some of the polypeptides was traced back by comparing the two-dimensional gels of plastid proteins with in organello translation products and with polypeptides which had been synthesized in vitro from poly(A+) mRNA preparations and posttranslationally imported by chloroplasts. Some polypeptides were specifically identified in two-dimensional gels by Western blot analysis.
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