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Influence of salicylic acid and L-phenylalanine on the accumulation of anthraquinone and phenolic compounds in adventitious root cultures of madder (Rubia tinctorum L.)

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Abstract

Madder (Rubia tinctorum L.) is a perennial plant that its roots and rhizomes have rich anthraquinone (AQ) derivatives including alizarin and purpurin. This study was carried out to determine the effects of salicylic acid (SA) and L-phenylalanine (L-Phe) applications on the root growth parameters and secondary metabolite accumulation in madder adventitious roots derived from internode parts without needing to be collected from nature. For this aim, two different L-Phe (50 and 100 µM) and SA (20 and 40 µM) were added separately and together to the liquid Murashige and Skoog (MS) medium cultured adventitious roots for 7 days. Then roots were evaluated in terms of fresh root weight, root growth index, dry root weight, and contents of total AQ, alizarin, purpurin, total phenolic contents (TPC), and some important phenolic compounds. According to the results, L-Phe stimulated the root growth of madder while the effects of SA on root growth parameters varied depending upon its concentrations. L-Phe had no significant influence on the total AQ, alizarin, and purpurin. Conversely, SA increased the AQs, and 20 µM SA was the most suitable application providing the greatest total AQ, alizarin, and purpurin. TPC and individual phenolic compounds changed according to the applications. Not only L-Phe but also SA had positive effects on the phenolic accumulation in adventitious roots. It was determined that the combinations of 40 µM SA and 100 µM L-Phe were the most effective applications in terms of phenolic accumulation.

Key message

Madder is a plant whose popularity has increased in food, cosmetics, pharmacy and recently medicine. This research was designed in order to produce high amounts of important secondary metabolites in adventitious root cultures of madder without the need to collect plants from nature. In this study, it has been shown that L-phenylalanine and salicylic acid applied to adventitious roots remarkably increase the production of anthraquinones and phenolics when used in appropriate concentrations and combinations.

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Abbreviations

AQ:

Anthraquinone

SA:

Salicylic acid

L-Phe:

L-Phenylalanine

IAA:

3-Indole acetic acid

DW:

Dry weight

TPC:

Total phenolic content

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Funding

The authors are thankful to TUBITAK (Scientific and Technological Research Council of Turkey) for the financial support for this research Project (TOVAG, Project No: 215O057).

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Contributions

The authors have made the following declarations regarding their contributions: TD and NGB conceived the design of the experiments. TD and ÖAA monitored the research work. TD collected and analyses sample data. TD and NGB contributed to writing the manuscript. All the authors read and approved the final manuscript.

Corresponding author

Correspondence to Tunhan Demirci.

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The authors declare that they have no conflict of interest.

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Communicated by Ali R. Alan.

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Demirci, T., Aras Ascı, Ö. & Göktürk Baydar, N. Influence of salicylic acid and L-phenylalanine on the accumulation of anthraquinone and phenolic compounds in adventitious root cultures of madder (Rubia tinctorum L.). Plant Cell Tiss Organ Cult 144, 313–324 (2021). https://doi.org/10.1007/s11240-020-01952-w

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  • DOI: https://doi.org/10.1007/s11240-020-01952-w

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