Summary
A system has been developed for rapid selection of streptomycin resistant mutants, as adventitious shoots arising from explants of several Solanaceous species. Efficient mutagenesis was achieved by incubating shoot culture-derived leaf strips with 1 or 5 mM nitroso-methylurea, for 90 or 120 min. In Nicotiana tabacum and Lycopersicon peruvianum these treatments resulted in white or variegated adventitious shoots from up to 3.5% of explants placed on medium promoting shoot regeneration. Chlorophyll deficiencies were only observed very rarely in Solanum nigrum. Streptomycin resistant shoots were obtained from leaf explants placed on medium containing 500 mg l-1 streptomycin sulphate, under which conditions explants are bleached and adventitious shoot development suppressed. Green adventitious s shoots appeared at a frequency dependent both on the mutagenic treatment and on the species. The best response was with S. nigrum where >70% of the explants produced streptomycin resistant shoots, most of which retained their resistance on subsequent testing. Maternal inheritance of streptomycin resistance has been confirmed for several N. tabacum and S. nigrum mutants, and there is also evidence for paternal transmission in the latter species. The procedure has been successfully extended to other species, including N. sylvestris and N. plumbaginifolia, and also to obtain spectinomycin resistant mutants.
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Cabe, P.F.M., Timmons, A.M. & Dix, P.J. A simple procedure for the isolation of streptomycin resistant plants in Solanaceae . Mol Gen Genet 216, 132–137 (1989). https://doi.org/10.1007/BF00332241
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DOI: https://doi.org/10.1007/BF00332241