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Abstract
Previous studies with haploid erythromycin-resistant mutants mapping to the Mendelian locus ery-M1 in Chlamydomonas reinhardi have revealed the presence of an altered chloroplast ribosomal protein (LC6) (Mets and Bogorad, 1971, 1972; Davidson et al., 1974). Vegetative diploids of C. reinhardi heterozygous at the ery-M1 locus have now been constructed. Chloroplast ribosomes from such diploids contain 60–70% wild-type form of protein LC6 and 30–40% altered form of LC6. Growth assays show that these diploids are partially resistant to erythromycin. Whether the diploids are grown in the presence or absence of erythromycin, the same ratio of wild-type: altered form of LC6 in chloroplast ribosomes is observed. Therefore, resistant chloroplast ribosomes must be able to carry out protein synthesis even when many of the sensitive chloroplast ribosomes are blocked by erythromycin.
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