Accumulation of anthocyanins and flavones during bud and flower development in Campanula isophylla Moretti
1997
Justesen, H. | Andersen, A.S. | Brandt, K.
In the blue flowers of Italian bellflower (Campanula isophylla Moretti), the formation of anthocyanins progresses from simple unacylated anthocyanins, delphinidin 3-glucoside and bisdeacylplatyconin, through a series of progressively-acylated and glycosylated compounds, including diacylated violdelphin and monodeacylcampanin, to the triacylated campanin. In this study, anthocyanin and flavone contents were very low in buds until a few days before anthesis, after which they increased rapidly. Bisdeacylplatyconin and luteolin 7-O-glucoside peaked 2 d before anthesis. The more complicated luteolin glucosides peaked 2 d after anthesis, slightly preceding monodeacylcampanin and campanin. Total anthocyanin content peaked approx. 5 d after anthesis followed by a slow decline. The highest total flavone content was reached at anthesis, after which it remained almost constant, but with some changes in the proportion of individual compounds. In the investigation two phenotypes were used, types B and C. Acylation of monodeacylcampanin to campanin is blocked in type B, but not in type C plants. Conversion of bisdeacylplatyconin into acylated anthocyanins was shown to be slower in type C than in type B plants.
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