Summary
Resistance to streptomycin and lincomycin in plant cell culture is used as a color marker: resistant cells are green whereas sensitive cells are white on the selective medium. Streptomycin and lincomycin at appropriate concentrations do not kill sensitive Nicotiana cells. The selective value of plastid ribosomal DNA mutations, conferring resistance to streptomycin and lincomycin, was investigated by growing heteroplastidic cells on a selective medium. The heteroplastidic cells were obtained by protoplast fusion, and contained a mixed population of streptomycin resistant plastids from the N. tabacum line Nt-SR1-Kan2, and lincomycin resistant plastids from the N. plumbaginifolia line Np-LR400-Hyg1. Clones derived from protoplast fusion were selected by kanamycin and hygromycin resistance, transgenic nuclear markers. Somatic hybrids were then grown on a selective streptomycin or lincomycin medium, or in the absence of either drug to a 50 to 100 mg size callus. Southern analysis of a polymorphic region of plastid DNA (ptDNA) revealed that somatic hybrids grown on streptomycin contained almost exclusively ptDNA from the streptomycin resistant parent, somatic hybrids grown on lincomycin contained almost exclusively ptDNA from the lincomycin resistant parent whereas somatic hybrids grown in the absence of either drug contained mixed parental plastids. Sensitive ptDNA was below detection level in most clones on selective medium, but could be recovered upon subsequent culture in the presence of the appropriate drug. The drugs streptomycin and lincomycin provide a powerful selection pressure that should facilitate recovery of plastid transformants.
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Communicated by R.G. Herrmann
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Moll, B., Polsby, L. & Maliga, P. Streptomycin and lincomycin resistances are selective plastid markers in cultured Nicotiana cells. Molec. Gen. Genet. 221, 245–250 (1990). https://doi.org/10.1007/BF00261727
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DOI: https://doi.org/10.1007/BF00261727