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Indirect shoot regeneration from root explants, assessment of clonal fidelity of regenerated plants using SCoT primers and antioxidant analysis in Thottea siliquosa (Lamk.) Ding Hou

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Abstract

An efficient shoot regeneration protocol has been developed for Thottea siliquosa (Lamk.) Ding Hou. via indirect shoot regeneration from root explants. Roots were collected from 45-day-old in vitro rooted shoots and cultured on Murashige and Skoog (MS) medium supplemented with various plant growth regulators for callus induction. Optimum callus induction (93%) was observed on 3.0 mg/l Kinetin (KN) and 1.0 mg/l 2, 4-Dichlorophenoxyacetic acid (2, 4- D). The highest shoot induction response from calli was obtained on 0.5 mg/l N6–Benzyladenine (BA) and 0.2 mg/l α-Naphthaleneacetic (NAA). Here, 100% of cultures responded with a mean number of 20.3 shoots per unit calli. The best rooting (90% induction with 20.8 roots per shoot) of shoots was obtained on half-strength MS medium supplemented with 1.0 mg/l Indole-3-butyric acid (IBA). The rooted shoots were acclimatized and transferred to the field with 92% success. The prolonged subculture of calli resulted in its decreased regeneration potential. The clonal fidelity of regenerated plants and mother plants analyzed by Start Codon Targeted (SCoT) primers revealed the genetic similarity between them. The field established in vitro propagated plants showed higher total polyphenol and flavonoid content and total antioxidant capacity than the field grown mother plant and root derived callus. The DPPH radicle scavenging activity showed higher antioxidant activity in field grown plants than the in vitro cultured plants. The in vitro regeneration protocol developed here will be utilized for the mass multiplication and genetic transformation of this medicinal plant.

Key message

An efficient micropropagation protocol via root derived callus mediated shoot organogenesis was developed for Thottea siliquosa. The comparison of phytochemicals and antioxidant activity of callus, roots of in vitro and mother plants was studied.

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The datasets generated during and/or analysed during the current study are available from the corresponding author on reasonable request.

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Acknowledgements

C. P. Krishna Vrundha thankfully acknowledges the financial support from CSIR, Govt. of India in the form of JRF and SRF [09/1108(0020)/2017-EMR-I].

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CPKV collected the plant material and performed the experiments, evaluated data, wrote the manuscript. TDT designed the experiments, contributed to writing and correcting the manuscript.

Corresponding author

Correspondence to T. Dennis Thomas.

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The authors declare that they have no conflict of interest.

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This research paper does not contain any studies with human participants or animals performed by any of the authors.

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Informed consent was obtained from all individual participants included in the study.

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Communicated by Pamela J. Weathers.

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Vrundha, C.P.K., Thomas, T.D. Indirect shoot regeneration from root explants, assessment of clonal fidelity of regenerated plants using SCoT primers and antioxidant analysis in Thottea siliquosa (Lamk.) Ding Hou. Plant Cell Tiss Organ Cult 155, 255–266 (2023). https://doi.org/10.1007/s11240-023-02578-4

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  • DOI: https://doi.org/10.1007/s11240-023-02578-4

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