A Comparative Analysis of the Hairy Root Induction Methods in Hypericum perforatum

Document Type: Research Paper

Authors

1 Department of Plant Breeding and Biotechnology, Faculty of Crop Sciences, Sari Agricultural Sciences and Natural Resources University, Sari, Iran.

2 Genetics and Agricultural biotechnology Institute of Tabarestan, Sari Agricultural Sciences and Natural Resources University, Mazandaran, Iran

3 Department of Pharmacognosy, Faculty of Pharmacy, Mazandaran University of Medical Sciences, Sari, Iran.

Abstract

Hypericum perforatum is a medicinal plant which Hypericin, Hyperforin and phenolic compounds are its active secondary metabolites. Hairy root induction by Agrobacterium rhizogenes in this plant is difficult and has low efficiency. In the present study two inoculation methods, immersion in bacterial suspension and direct injection of A. rhizogenes has been compared. For this purpose, the best conditions for H. perforatum hairy root induction including A. rhizogenes strains (A4, LBA9402, NCPPB2656), plant explants (Stem, Apical bud, leaves), co-cultivation media (MS, ½MS, B5, and ½B5) and Acetosyringone concentration (0 and 100 µM) were specified and used for comparative analysis. It was found that strain A4, Stem explants, ½MS co-cultivation medium without Acetosyringone constitute the best conditions for hairy root induction of H. perforatum. Transgenic nature of the potential hairy roots was confirmed using PCR and specific rolB gene primers. The results showed that the efficiency of applying direct injection method is four times higher than immersion in bacterial suspension in H. perforatum hairy root induction. In general, the results indicate that direct injection can be the method of choice to successful hairy root induction in H. perforatum.

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