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265 - 274
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Recent studies are reviewed suggesting the existence of a chloroplast factor controlling the expression of nuclear genes. Nuclear genes coding for certain chloroplast proteins and for the non-chloroolast enzyme nitrate reductase show a light-induced expression at high rates only in green leaf tissue· The gene products, mRNA and polypeptides, are not accumulated in cells containing undifferentiated plastids such as root cells or cultured cells and also not in non-green leaf cells of mutant plants or herbicide-treated plants· However, these genes are expressed in root cells or callus cells containing green chloroplasts. These data indicate that the presence of differentiated chloroplasts is a prerequisite for normal expression of the analyzed genes.
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