Abstract
Phenylalanine ammonia-lyase (PAL) activity, 11 phenolic acids and lignin accumulation in Matricaria chamomilla roots exposed to low (3 μM) and high (60 and 120 μM) levels of cadmium (Cd) or copper (Cu) for 7 days were investigated. Five derivatives of cinnamic acid (chlorogenic, p-coumaric, caffeic, ferulic and sinapic acids) and six derivatives of benzoic acid (protocatechuic, vanillic, syringic, p-hydroxybenzoic, salicylic acids and protocatechuic aldehyde) were detected. Accumulation of glycoside-bound phenolics (revealed by acid hydrolysis) was enhanced mainly towards the end of the experiment, being more expressive in Cu-treated roots. Interestingly, chlorogenic acid was extremely elevated by the highest Cu dose (21-fold higher than control) suggesting its involvement in antioxidative protection. All compounds, with the exception of chlorogenic acid, were detected in the cell wall bound fraction, but only benzoic acids were found in the ester-bound fraction (revealed by alkaline hydrolysis). Soluble phenolics were present in substantially higher amounts in Cu-treated roots and more Cu was retained there in comparison to Cd. Cu strongly elevated PAL activity (by 5.4- and 12.1-fold in 60 and 120 μM treatment, respectively) and lignin content (by 71 and 148%, respectively) after one day of treatment, indicating formation of a barrier against metal entrance. Cd had slighter effects, supporting its non-redox active properties. Taken together, different forms of phenolic metabolites play an important role in chamomile tolerance to metal excess and participate in active antioxidative protection.
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Abbreviations
- DW:
-
Dry weight
- PAL:
-
Phenylalanine ammonia-lyase
- ROS:
-
Reactive oxygen species
- t-CA:
-
trans-cinnamic acid
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Acknowledgements
This work was financially supported by the Slovak Grant Agency (VEGA 1/3260/06) and Grant Agency of the Czech Republic (GA ČR 521/02/1367). The authors are grateful to Mrs. Anna Michalčová, Ms. Lucia Tomková and Bc. František Štork for their excellent technical assistance and to Prof. Vlastimil Kubáň and Andrew J. Billingham for proofreading the manuscript.
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Communicated by M. Petersen.
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Kováčik, J., Klejdus, B. Dynamics of phenolic acids and lignin accumulation in metal-treated Matricaria chamomilla roots. Plant Cell Rep 27, 605–615 (2008). https://doi.org/10.1007/s00299-007-0490-9
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DOI: https://doi.org/10.1007/s00299-007-0490-9