Abstract:
:A cell line of Eschscholtzia californica selected for meta-fluorotyrosine (MFT) tolerance was found to have 10-fold increased levels of phenylalanine and tyrosine compared to the parent line, while most other amino acids were only increased 2-fold. Tracer experiments with shikimic acid in the presence of MFT showed that the biosynthesis of the aromatic amino acids was not impaired in the tolerant line. Feeding experiments with phenylalanine, tyrosine, or shikimic acid also revealed a reduced turnover of the pools of the aromatic amino acids in the variant. Thus undisturbed de novo biosynthesis of the aromatic amino acids and dilution of toxic effects of MFT by the enlarged pool sizes seemed to be the main reason for the acquired tolerance. Despite the enlarged availability of the precursor tyrosine, formation of the benzophenanthridine alkaloids was enhanced neither in the growth nor in the production medium.
journal_name
Plant Physioljournal_title
Plant physiologyauthors
Berlin J,van Huystee RB,Witte L,Bender J,Jäger HJ,Wray Vdoi
10.1104/pp.89.4.1299subject
Has Abstractpub_date
1989-04-01 00:00:00pages
1299-305issue
4eissn
0032-0889issn
1532-2548journal_volume
89pub_type
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