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Increasing the synthesis of bioactive abietane diterpenes in Salvia sclarea hairy roots by elicited transcriptional reprogramming

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A Correction to this article was published on 10 August 2018

An Erratum to this article was published on 27 December 2016

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Abstract

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Transcriptional activation of genes belonging to the plastidial MEP-derived isoprenoid pathway by elicitation with methyl jasmonate and coronatine enhanced the content of bioactive abietane diterpenes in Salvia sclarea hairy roots.

Abstract

We have shown that aethiopinone, an abietane diterpene synthesized in Salvia sclarea roots is cytotoxic and induces apoptosis in human melanoma cells. To develop a production platform for this compound and other abietane diterpenes, hairy root technology was combined with the elicitation of methyl jasmonate (MeJA) or the phytotoxin coronatine (Cor). Both MeJA and Cor induced a significant accumulation of aethiopinone, but prolonged exposure to MeJA irremediably caused inhibition of hairy root growth, which was unaffected by Cor treatment. Considering together the fold increase in aethiopinone content and the final hairy root biomass, the best combination was a Cor treatment for 28 days, which allowed to obtain up to 105.34 ± 2.30 mg L−1 of this compound to be obtained, corresponding to a 24-fold increase above the basal content in untreated hairy roots. MeJA or Cor elicitation also enhanced the synthesis of other bioactive abietane–quinone diterpenes. The elicitor-dependent steering effect was due to a coordinated transcriptional activation of several biosynthetic genes belonging to the plastidial MEP-derived isoprenoid pathway. High correlations between aethiopinone content and MeJA or Cor-elicited level of gene transcripts were found for DXS2 (r 2 = 0.99), DXR (r 2 = 0.99), and GGPPS (r 2 = 0.98), encoding enzymes acting upstream of GGPP, the common precursor of diterpenes and other plastidial-derived terpenes, as well as CPPS (r 2 = 0.99), encoding the enzyme involved in the first cyclization steps leading to copalyl-diphosphate, the precursor of abietane-like diterpenes. These results point to these genes as possible targets of metabolic engineering approaches to establish a more efficient production platform for such promising anti-proliferative plant-derived compounds.

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Change history

  • 10 August 2018

    Unfortunately, the second author name was wrongly published in the original publication. The correct author name should read as follows.

  • 27 December 2016

    An erratum to this article has been published.

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Acknowledgements

This work was supported by FARB 2014 funds of the University of Salerno to AL. MV is also grateful for the short-term mobility funds of the COST Action FA 1006 “Plant Metabolic Engineering for High Value Products”.

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Correspondence to A. Leone.

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The authors declare that they have no conflict of interest.

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Communicated by E. Benvenuto.

The original version of this article was revised: The second author "M. E. Alfieri" was incorrect. This error has been corrected.

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299_2016_2076_MOESM1_ESM.tif

Hairy root biomass, expressed as dry weight, of S. sclarea hairy root lines treated with MeJA (100 µM) or Cor (0.1 µM) for 7 or 28 days, compared to control hairy roots, during one month of culture. Data represent mean values ± SD of three experiments (TIFF 77 kb)

Supplementary material 2 (TIFF 288 kb)

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Vaccaro, M.C., Mariaevelina, A., Malafronte, N. et al. Increasing the synthesis of bioactive abietane diterpenes in Salvia sclarea hairy roots by elicited transcriptional reprogramming. Plant Cell Rep 36, 375–386 (2017). https://doi.org/10.1007/s00299-016-2076-x

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  • DOI: https://doi.org/10.1007/s00299-016-2076-x

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