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meta-Topolin-induced in vitro propagation, field evaluation, flow cytometry and molecular marker-based genetic stability assessment of potato cv. Badami alu

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Abstract

Potato (Solanum tuberosum L.), belonging to Solanaceae family, globally ranks as the fourth-largest food (vegetable) crop. In order to sustain the supply of quality propagules, a large-scale in vitro shoot, microtuber and root development protocol was successfully established for potato cv. Badami alu, for the first time. Initially, the tuber sprout explants were inoculated in Murashige and Skoog (MS) basal medium individually with 0.5–1.5 mg/l 6-benzyladenine, kinetin, meta-topolin (mT) and zeatin (Zea) for regeneration. The earliest (~ 3 days) shoot initiation with maximum number (~ 9) and length (81 mm) shoots were recorded in MS medium fortified with 1 mg/l mT after 4 weeks of growth period. The earliest (44 days) microtuber formation with maximum number (4.3) was recorded in MS medium fortified with 1 mg/l Zea after 8 weeks growth stage. On the other hand, the hierarchical clustering heat map, network plot, and principal component analyses illustrated the association among cytokinins (sources and concentrations) and the different growth attributes under study. In vitro-regenerated shootlets were then cultured in MS medium individually with 1–3 mg/l indole-3-acetic acid (IAA) and indole-3-butyric acid. The earliest (~ 7 days) root induction was recorded in MS medium with 1 mg/l IAA, whereas the maximum number (47) with most elongated (28.3 mm) roots were recorded in 2 mg/l IAA after 4 weeks culture period. The micropropagated plantlets were grown in cocopeat (for 1 month) followed by soil (for 2 months) under field conditions (shade net house) that resulted in 95% survival rate. Stability of ploidy level of micropropagated and successively field-grown plantlets with their mother plant was affirmed by flow cytometry, likewise, genetic fidelity was assessed for the same via inter simple sequence repeats, directed amplification of minisatellite-region DNA, start codon targeted polymorphism, and conserved DNA-derived polymorphism markers, and a 100% monomorphism was found, proving that there was no genetic variation among them. Since there is no report of non-conventional mass propagation of this cultivar to date, the present protocol will be immensely helpful for its accelerated large-scale propagation and its genetic improvement.

Key message

First report on usage of meta-Topolin and zeatin for micropropagation and microtuberization followed by acclimatization and field performance of true-to-type propagules (ensured by flow cytometry and molecular markers) in potato.

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Data Availability

All data generated or analysed during this study are included in this published article.

Abbreviations

AFLP:

Amplified fragment length polymorphism

BA:

6-benzyladenine

BAP:

6-benzylaminopurine

CDDP:

Conserved DNA-derived polymorphism

DAMD:

Directed amplification of minisatellite-region DNA

FCM:

Flow cytometry

IAA:

Indole-3-acetic acid

IBA:

Indole-3-butyric acid

ISSR:

Inter simple sequence repeats

Kn:

Kinetin

MS:

Murashige and Skoog

mT:

meta-Topolin

NPA:

Network plot analysis

PCR:

Polymerase chain reaction

PGR:

Plant growth regulator

RAPD:

Random amplified polymorphic DNA

SCoT:

Start codon targeted

Zea:

Zeatin

References

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Acknowledgements

The authors acknowledge the experimental facilities from Plant Tissue Culture and Molecular Biology laboratories at Regional Nuclear Agriculture Research Centre, Bidhan Chandra Krishi Viswavidyalaya, West Bengal, India. Authors express their gratefulness to Dr. Sayantan De and Dr. Joyashree Mallick from Zonal Adaptive Research Station (Krishnanagar), Govt. of West Bengal, India for providing the potato germplasm and also for the assistance during the acclimatization process.

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This research didn’t receive any funding.

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Authors

Contributions

MC : Methodology, Investigation, Data curation, Formal analysis, Writing – original draft. TS : Methodology, Investigation, Data curation, Formal analysis, Writing – original draft, review & editing. SB : Conceptualization, Supervision, Writing – review & editing. SG : Conceptualization, Supervision, Resources, Methodology, Investigation, Data curation, Formal analysis, Software, Validation, Writing – original draft, review & editing.

Corresponding author

Correspondence to Saikat Gantait.

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

Conflict of interest

The authors declare that they have no conflict of interest. SG is one of the Associate Editors of the journal. As such he was fully excluded during all the evaluation period of this work, had no access to its handling during peer-refereeing, and his status had no bearing on the editorial consideration of the manuscript.

Additional information

Communicated by Sergio J. Ochatt.

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Char, M., Subrahmanyeswari, T., Bhattacharyya, S. et al. meta-Topolin-induced in vitro propagation, field evaluation, flow cytometry and molecular marker-based genetic stability assessment of potato cv. Badami alu. Plant Cell Tiss Organ Cult 155, 809–826 (2023). https://doi.org/10.1007/s11240-023-02601-8

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  • DOI: https://doi.org/10.1007/s11240-023-02601-8

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