Summary
Chloroplast gene mutations which confer antibiotic resistance on chloroplast ribosomes of the green alga Chlamydomonas reinhardtii have been tested for allelism and mapped by recombination analysis of progeny from biparental zygote clones. Thirty-one independently isolated streptomycin resistant mutants have chloroplast ribosomes which are resistant to this drug in an assay based on misreading of isoleucine in response to a poly U template, and comprise one nuclear and four chloroplast gene loci. Four mutants resistant to spectinomycin, and three mutants resistant to neamine and kanamycin, which have chloroplast ribosomes resistant to their respective antibiotics in poly U directed phenylalanine incorporation, appear to map in a single chloroplast gene locus. Representative alleles of this nr/spr locus, the four streptomycin resistance loci, and two chloroplast gene loci for erythromycin resistance, have been analyzed in a series of parallel crosses to establish the following map order for these seven genes in the chloroplast genome: er-u-la-er-u-37-nr-u-2-1/spr-u-1-H-4-sr-u-2-23-sr-u-2-60-sr-u-sm3-sr-u-sm2. These seven genes may constitute a ribosomal region within the chloroplast genome of Chlamydomonas comparable to the ribosomal gene clusters in bacteria.
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Harris, E.H., Boynton, J.E., Gillham, N.W. et al. Mapping of chloroplast genes involved in chloroplast ribosome biogenesis in Chlamydomonas reinhardtii . Molec. Gen. Genet. 155, 249–265 (1977). https://doi.org/10.1007/BF00272804
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DOI: https://doi.org/10.1007/BF00272804