Abstract
Novel flavonoids were formed in young leaves of apple (Malus × domestica) after treatment with the dioxygenase inhibitor prohexadione-Ca, which is known to reduce the incidence and severity of fire blight caused by Erwinia amylovora and other plant diseases. The compounds were isolated and identified as luteoliflavan, luteoliflavan 5-glucoside, eriodictyol 7-glucoside and 6″-O-trans-p-coumaroyleriodictyol 3′-glucoside. These flavonoids represent a novel biosynthetic pathway in apple leading to the formation of 3-deoxyflavans. Concomitantly, the content of regularly occurring phenylpropanoids is also influenced by prohexadione-Ca with increasing amounts of hydroxycinnamic acids and decreasing flavan-3-ols and flavonols. The altered flavonoid metabolism may be related to the lowered pathogen incidence though the isolated novel flavonoids do not exhibit antibacterial activity.
| Original language | English |
|---|---|
| Pages (from-to) | 709-716 |
| Number of pages | 8 |
| Journal | Phytochemistry |
| Volume | 64 |
| Issue number | 3 |
| DOIs | |
| State | Published - Oct 2003 |
Keywords
- 3-Deoxyflavonoids
- Apple, Erwinia amylovora
- Dioxygenase inhibitor
- Flavonoids
- Malus × domestica
- Prohexadione-Ca
- Resistance
- Rosaceae