Abstract
The use of increasing knowledge on regulation of nitrate reductase activity in Nicotiana cell cultures is the basis for the described optimization of in vitro selection for nitrate reductase-deficient mutants by screening for chlorate resistance. Selection was carried out on haploid mesophyll protoplast-derived cell cultures of Nicotiana plumbaginifolia. It is demonstrated that revised selection results in high variant detectability and increased variant confirmability in comparison with the hitherto used selection scheme.
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