Summary
Protoplasts were derived from haploid and diploid Nicotiana sylvestris and N. tabacum. Exposure of the protoplasts to mutagenic doses of ultraviolet (U.V.) radiation prior to two selection rounds in the presence of 4 mM (or 5 mM) and 8 mM of valine, respectively, was required to obtain cell lines with persistent valine resistance. Such lines were obtained from haploid and diploid N. sylvestris protoplasts as well as from haploid protoplasts of N. tabacum but not from (1.8 × 107) diploid N. tabacum protoplasts. The ratio between number of verified valine-resistant cell lines and the initial number of U.V. exposed protoplasts enabled the estimation of the following order of mutation frequency: haploid N. sylvestris > haploid N. tabacum > diploid N. sylvestris. Plants which retained the valine resistance and transmitted it to their sexual progeny were derived from the resistant cell lines.
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Vunsh, R., Aviv, D. & Galun, E. Valine resistant plants derived from mutated haploid and diploid protoplasts of Nicotiana sylvestris and N. tabacum . Theoret. Appl. Genetics 64, 51–58 (1982). https://doi.org/10.1007/BF00303650
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DOI: https://doi.org/10.1007/BF00303650