Title : In vivo inhibition of polyamine biosynthesis and growth in tobacco ovary tissues.

Pub. Date : 1985

PMID : 11539696






5 Functional Relationships(s)
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1 DL-alpha-Difluoromethylornithine (DFMO) and DL-alpha-difluoromethylarginine (DFMA), specific, irreversible ("suicide") inhibitors of ODC and ADC in vitro, were used to modulate PA biosynthesis in excised flowers. Eflornithine ornithine decarboxylase Nicotiana tabacum
2 In vivo inhibition of ODC with DFMO resulted in a significant decrease in PA titers, ovary fresh weight and protein content. Eflornithine ornithine decarboxylase Nicotiana tabacum
3 Simultaneous inhibition of both decarboxylases by DFMO and DFMA produced only a marginally greater depression in growth and PA titers, indicating that ODC activity is rate-limiting for PA biosynthesis in these tissues. Eflornithine ornithine decarboxylase Nicotiana tabacum
4 In vivo inhibition of ODC by DFMA appears to result from arginase-mediated hydrolysis of this inhibitor to urea and DFMO, the suicide substrate for ODC. Eflornithine ornithine decarboxylase Nicotiana tabacum
5 In vivo inhibition of ODC by DFMA appears to result from arginase-mediated hydrolysis of this inhibitor to urea and DFMO, the suicide substrate for ODC. Eflornithine ornithine decarboxylase Nicotiana tabacum