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Heterologous expression of an acid phosphatase gene and phosphate limitation leads to substantial production of chicoric acid in Echinacea purpurea transgenic hairy roots

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Abstract

Main conclusion

A high level of the secondary metabolite chicoric acid is produced by intracellular Pi supply and extracellular phosphate limiting in Echinacea purpurea hairy roots.

Abstract

Chicoric acid (CA) is a secondary metabolite which is gained from Echinacea purpurea. It has been found to be one of the most potent HIV integrase inhibitors with antioxidant and anti-inflammatory activities. However, the low-biosynthesis level of this valuable compound becomes an inevitable obstacle limiting further commercialization. Environmental stresses, such as phosphorus (Pi) deficiency, stimulate the synthesis of chemical metabolites, but significantly reduce plant growth and biomass production. To overcome the paradox of dual opposite effect of Pi limitation, we examined the hypothesis that the intracellular Pi supply and phosphate-limiting conditions enhance the total CA production in E. purpurea hairy roots. For this purpose, the coding sequence (CDS) of a purple acid phosphatase gene from Arabidopsis thaliana, AtPAP26, under CaMV-35S promoter was overexpressed in E. purpurea using Agrobacterium rhizogenes strain R15834. The transgenic hairy roots were cultured in a Pi-sufficient condition to increase the cellular phosphate metabolism. A short-term Pi starvation treatment of extracellular phosphate was applied to stimulate genes involved in CA biosynthesis pathway. The overexpression of AtPAP26 gene significantly increased the total APase activity in transgenic hairy roots compared to the non-transgenic roots under Pi-sufficient condition. Also, the transgenic hairy roots showed increase in the level of total and free phosphate, and in root fresh and dry weights compared to the controls. In addition, the phosphate limitation led to significant increase in the expression level of the CA biosynthesis genes. Considering the increase of biomass production in transgenic vs. non-transgenic hairy roots, a 16-fold increase was obtained in the final yield of CA for transgenic E. purpurea roots grown under −P condition compared to +P non-transgenic roots. Our results suggested that the expression of phosphatase genes and phosphate limitation were significantly effective in enhancing the final production yield and large-scale production of desired secondary metabolites in medicinal plant hairy roots.

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Abbreviations

APase:

Acid phosphatase (EC 3.1.3.2)

CA:

Chicoric acid

C3H:

Cinnamate-3-hydroxylase

C4H:

Cinnamate-4-hydroxylase

4CL:

4-coumarate-CoA ligase

HCT:

Shikimate O-hydroxycinnamoyl transferase

PAL:

Phenylalanine ammonia-lyase

PAP:

Purple acid phosphatase

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Acknowledgements

This research was partly granted by Agrohydrology Research Group of Tarbiat Modares University (Grant No. IG-39713).

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Authors and Affiliations

  1. Department of Agricultural Biotechnology, Faculty of Agriculture, Tarbiat Modares University, Tehran, Iran

    Meisam Salmanzadeh

  2. Department of Plant Genetics and Breeding, Faculty of Agriculture, Tarbiat Modares University, Tehran, 14115-336, Iran

    Mohammad Sadegh Sabet & Ahmad Moieni

  3. Department of Irrigation and Drainage, Tarbiat Modares University, Tehran, Iran

    Mehdi Homaee

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  1. Meisam Salmanzadeh
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Salmanzadeh, M., Sabet, M.S., Moieni, A. et al. Heterologous expression of an acid phosphatase gene and phosphate limitation leads to substantial production of chicoric acid in Echinacea purpurea transgenic hairy roots. Planta 251, 31 (2020). https://doi.org/10.1007/s00425-019-03317-w

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