Abstract
In the short-day plant Chrysanthemum (Chrysanthemum morifolium Ramat. variety Pavo) putrescine and spermidine conjugates appeared in the apical bud before the first observable transformation of the meristem into floral structures. These compounds accumulated on floral initiation and well before floral evocation. Spermidine conjugates were predominant during floral initiation whereas free amines did not accumulate to any significant extent. Different associations of amides were observed during floral initiation as compared with the reproductive phase. 3,4-Dimethoxyphenethylamine conjugates (water-insoluble compounds) were the predominant amine conjugates observed during flower development. These compounds decreased drastically after fertilization. In vegetative buds from plants grown in long days polyamine conjugates were very low and appeared as plants aged. We present evidence that ornithine decarboxylase (ODC) regulates putrescine biosynthesis during floral initiation and floral development. When ODC action was blocked by DFMO (α-DL-difluoromethylornithine, a specific, irreversible inhibitor of ODC), flowering was inhibited, and free and conjugated polyamines were not detected. This treatment led to a slight enhancement of ADC activity. When putrescine was added, polyamine titers and flowering were restored. A similar treatment with DFMA (α-DL difluoromethylarginine, a specific, irreversible inhibitor of ADC) did not affect flowering and the polyamine titers. The results suggest that ODC and polyamine conjugates are involved in regulating floral initiation in Chrysanthemum.
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Abbreviations
- ADC:
-
arginine decarboxylase
- ODC:
-
ornithine decarboxylase
- DFMA:
-
α-DL-difluoromethylarginine
- DFMO:
-
α-DL-difluoromethylornithine
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Aribaud, M., Martin-Tanguy, J. Polyamine metabolism, floral initiation and floral development in Chrysanthemum (Chrysanthemum morifolium Ramat.). Plant Growth Regul 15, 23–31 (1994). https://doi.org/10.1007/BF00024673
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DOI: https://doi.org/10.1007/BF00024673