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THE PLANT CELL, Vol 3, Issue 10 1131-1140, Copyright © 1991 by American Society of Plant Biologists

RESEARCH ARTICLES

Developmental Regulation of the Plastid Protein Import Apparatus

C. Dahlin and K. Cline
Fruit Crops Department, University of Florida, 1109 Fifield Hall, Gainesville, Florida 32611

Plastid development involves the programmed accumulation of proteins. Most plastid proteins are synthesized in the cytosol and imported into the organelle by an envelope-based protein import apparatus. Previous studies have shown that developmental rates of protein accumulation correspond to mRNA levels. Here, we examined the relationship between plastid development and the activity of the protein import apparatus. Developing plastids, primarily from wheat leaves, were analyzed for their protein import capability in vitro. Import capability, initially high in proplastids, declined as much as 20-fold as plastid development approached either the mature etioplast or the mature chloroplast. The observed decline was not due to senescence, nonspecific inhibitors, or protein turnover. Furthermore, the import capability of mature etioplasts, initially very low, was transiently reactivated during light-mediated redifferentiation into chloroplasts. These results suggest that plant cells regulate the import apparatus in concert with the protein demands of the developing plastids.


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Copyright © 1991 by the American Society of Plant Biologists