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Plant regeneration through direct and indirect organogenesis, phyto-molecular profiles, antioxidant properties and swertiamarin production in elicitated cell suspension cultures of Swertia minor (Griseb.) Knobl

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Abstract

The present study reports an optimized protocol for high frequency in vitro plant propagation through direct and indirect organogenesis, phytochemical accumulation, molecular profiling and antioxidant evaluation for micropropagated Swertia minor, a promising alternative to industrially important Swertia chirayita. Moreover, the study also aimed at enhancing the production of antidiabetic and anti-obesity drug swertiamarin using an alternative technology of elicitated cell suspension cultures. Different types, concentrations and combination of cytokinins and auxins showed their effects during various in vitro growth stages. A combination of BAP (3.0 mg/l) and TDZ (1.0 mg/l) had a dominant role in promoting multiple shoot proliferation with production of an average of 19.1 ± 0.95 shoots/node in 85% response. MS medium added with IBA (2.0 mg/l) showed optimal response for in vitro rooting (9.2 ± 0.56 roots/shoot). In order to establish genetic stability, molecular marker-based profiling of micropropagated plants were done and 'monomorphic banding pattern were identical to the mother plants. 2,4-D (2.0 mg/l) supported the maximum callus induction and proliferation rate (95%). The wild-grown plants showed higher polyphenols content and antioxidant activities as compared to callus and in vitro derived plantlets. However, chitosan-treated (25 ppm) methanolic extract of cell biomass accumulated in cell suspension cultures produced higher contents of swertiamarin (1.45 mg/g DW) than salicylic acid and methyl jasmonate. The described protocol can be effectively used for the large-scale propagation, exploitation of active compounds and will serve as potential alternative to S. chirayita for fulfillment of over-growing industrial requirements.

Key message

The present investigation addressed in vitro regeneration, callus culture, somatic embryogenesis, molecular profiling, secondary metabolite production, cell suspension culture studies for first time in Swertia minor.

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Abbreviations

ABTS:

2, 2-azino-bis (3-ethylbenzo-thiazoline-6-sulphonic acid)

AEAC:

Ascorbic acid equivalent antioxidant capacity

DMPD:

N, N-dimethyl-p-phenylenediamine

DPPH:

1, 1- diphenyl-1-picryl hydrazyl

DW:

Dry weight

FRAP:

Ferric reducing antioxidant power

FW:

Fresh weight

g:

Gram

MeJA:

Methyl jasmonate

mg:

Milligram

MS:

Murashige and Skoog’s medium

PGR(s):

Plant growth regulator(s)

RF:

Regeneration frequency

RP-UFLC:

Reverse phase-ultra flow liquid chromatography

RSA:

Radical scavenging activity

SA:

Salicylic acid

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Acknowledgements

First author gratefully acknowledges the financial support by UGC New Delhi India for awarding Dr. D. S. Kothari PDF (No.F.42/2006 (BSR)/BL/1415/0461). Authors extend their gratitude towards the Head, Department of Biotechnology, Shivaji University, Kolhapur and the Principal, Yashavantrao Chavan Institute of Science (Autonomous), Satara for providing necessary laboratory facilities.

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PRK, JJC, NBG designed the experiment, performed tissue culture experiments, contributed to writing and corrected manuscript. PRK, AM and SS performed phytochemical experiments, collected and analyzed data, wrote the manuscript. JJC, NBG and VAB helped in experimental accomplishment, corrected manuscript.

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Correspondence to Parthraj R. Kshirsagar.

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Communicated By Amita Bhattacharya.

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Kshirsagar, P.R., Mohite, A., Suryawanshi, S. et al. Plant regeneration through direct and indirect organogenesis, phyto-molecular profiles, antioxidant properties and swertiamarin production in elicitated cell suspension cultures of Swertia minor (Griseb.) Knobl. Plant Cell Tiss Organ Cult 144, 383–396 (2021). https://doi.org/10.1007/s11240-020-01962-8

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