Summary
Two S-(2-aminoethyl)L-cysteine (AEC) resistant lines were isolated by screening mutagenized protoplasts from diploid N. sylvestris plants. Both lines accumulated free lysine at levels 10 to 20-fold higher than in controls. Lysine overproduction and AEC-resistance were also expressed in plants regenerated from the variant cultures. A feedback insensitive form of dihydrodipicolinate synthase (DHPS), the pathway specific control enzyme for lysine synthesis, was detected in callus cultures and leaf extracts from the resistant lines. Aspartate kinase (AK), the other key enzyme in the regulation of lysine biosynthesis, was unaltered in the mutants. Crosses with wild type plants indicated that the mutation conferring insensitivity to feedback in DHPS, with as result overproduction of lysine and resistance to AEC, was inherited as a single dominant nuclear gene.
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Abbreviations
- AK:
-
aspartate kinase (EC 2.7.2.4)
- DHPS:
-
dihydrodipicolinate synthase (EC 4.2.1.52)
- AEC:
-
S-(2-aminoethyl)L-cysteine
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Communicated by G. Wenzel
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Negrutiu, I., Cattoir-Reynearts, A., Verbruggen, I. et al. Lysine overproducer mutants with an altered dihydrodipicolinate synthase from protoplast culture of Nicotiana sylvestris (Spegazzini and Comes). Theoret. Appl. Genetics 68, 11–20 (1984). https://doi.org/10.1007/BF00252303
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DOI: https://doi.org/10.1007/BF00252303