Abstract
Summary Ribosomes, ribosomal RNAs and soluble proteins of leaves were studied in wild-type and two chloroplast mutants of maize. The mutants are inherited in Mendelian manner and are characterized by accumulating ζ -carotene ( ζ -mutant) and lycopin ( ly -mutant) instead of β -carotene. Sedimentation pattern of the ribosomes shows a reduced amount of 70S ribosomes in the dark-grown mutants. There are even fewer 70S ribosomes present in the mutant leaves grown in the light. In parallel a low amount of chloroplast rRNA is present in the mutant leaves. Gel electrophoresis of leaf extracts shows a low content of Fraction I protein in the mutant. It is suggested that several abnormalities found in the mutants are due to the low level of 70S ribosomes.
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