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Articles

Expression of 5-Methyltryptophan Resistance in Plants Regenerated from Resistant Cell Lines of Datura innoxia¹

Department of Agronomy, University of Illinois, Urbana, Illinois 61801

Seventy-nine 5-methyltryptophan-resistant cell lines have been selected from haploid Datura innoxia Mill. cell cultures by plating suspensions in agar medium containing a growth inhibitory concentration of 5-methyltryptophan. Mutagen treatment increased the frequency of resistance. The eleven variants tested posses an altered anthranilate synthase less sensitive to feedback inhibition by tryptophan. All five of the variants which were analyzed for free amino acids contained elevated levels of free tryptophan (8 to 30 times the wild type level). None of the selected cell lines were auxin-autotrophic. Resistance to 5-methyltryptophan, altered anthranilate synthase, and high free tryptophan (4 to 44 times) were also expressed in leaves of plants regenerated from the variant lines and in cultures reinitiated from the resistant plants. These results show that the amino acid overproduction phenotype can be selected at the cellular level of organization and be expressed identically in whole plants regenerated from the selected cells.

¹ Supported by funds from the Illinois Agricultural Experiment Station, the Science and Education Administration of the United States Department of Agriculture Grant 59-2171-1-1-736-0 from the Competitive Research Grants Office, and National Science Foundation Grant PCM 80-10927.

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