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| Content Provider | Springer Nature Link |
|---|---|
| Author | Kováčik, Jozef Kron, Ivan Repčák, Miroslav Bačkor, Martin |
| Copyright Year | 2007 |
| Abstract | Four-week-old chamomile (Matricaria chamomilla) plants were exposed for 72 h to 0.01, 0.1 and 1 mM phenylalanine (Phe) or tyrosine (Tyr). Phe at all concentrations significantly increased phenylalanine ammonia-lyase (PAL) activity (by 30, 76 and 90%, respectively) as well as accumulation of coumarin-related compounds (herniarin and its precursors (Z)- and (E)-2-β-D-glucopyranosyloxy-4-methoxycinnamic acids). Free Phe content increased significantly at the highest dose tested. Lower Tyr concentrations (0.01 and 0.1 mM) significantly increased PAL activity and increased free Tyr content, however free Phe content decreased. This indicated that Tyr-mediated stimulation of PAL is coupled to Phe consumption. Notwithstanding, Tyr had no effect on coumarin accumulation. Therefore we speculate that in chamomile a regulation/signalling mechanism could be operating in the pathway leading to coumarin synthesis. The malondialdehyde accumulation, an usual marker of stress in plants, was not significantly changed by amino acid supplements, suggesting that membrane damage is not the signal causing coumarin accumulation. In parallel experiment we observed that neither lower (0.25 × full strength), nor higher (3 × full strength) nitrogen concentration of nutrient solution compared to normal (1 × full strength, 205 mg N l-1) solution used for Phe/Tyr supply affected herniarin and GMCAs accumulation. This indicates that Phe had stimulatory effect on PAL activity and coumarin metabolism. |
| Starting Page | 9 |
| Ending Page | 15 |
| Page Count | 7 |
| File Format | |
| ISSN | 01676903 |
| Journal | Plant Growth Regulation |
| Volume Number | 52 |
| Issue Number | 1 |
| e-ISSN | 15735087 |
| Language | English |
| Publisher | Springer Netherlands |
| Publisher Date | 2007-03-17 |
| Publisher Place | Dordrecht |
| Access Restriction | One Nation One Subscription (ONOS) |
| Subject Keyword | Coumarins Lipid peroxidation Matricaria chamomilla Phenylalanine Phenylalanine ammonia-lyase Tyrosine Plant Physiology |
| Content Type | Text |
| Resource Type | Article |
| Subject | Physiology Plant Science Agronomy and Crop Science |
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