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Micropropagation using direct and indirect organogenesis in Artemisia maritima L.: scanning electron microscopy of somatic embryos and genome size analysis by flow cytometry

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Abstract

In this study, an efficient, reproducible, and genetically stable regeneration protocol has been developed in Artemisia maritima L. The experiments were conducted for callus induction, plant regeneration, and somatic embryogenesis using stem and leaf of A. maritima as explants. The optimal callus induction (81.3%) was observed on 2.5 mg L−1 2,4-dichlorophenoxyacetic acid (2,4-D) and 1.5 mg L−1 6-benzylaminopurine (BAP). The shoot regeneration was observed on different concentrations of BAP, α-naphthaleneacetic acid (NAA), and thidiazuron (TDZ), using nodal segments and microshoot tips as explants. The microshoot tips were more responsive compared to nodal segments with the highest induction frequency (90.33%) obtained on 1.5 mg L−1 BAP. Maximum root induction frequency (74.36%) was obtained on 1.5 mg L−1 NAA. The somatic embryogenesis was induced on Murashige and Skoog (MS) medium amended with TDZ and indole-3-butyric acid (IBA) with maximum embryogenic induction frequency on 1.0 mg L−1 TDZ and 2.5 mg L−1 IBA. The somatic embryos developed into globular, heart-shaped, and bipolar plantlet stages on BAP and NAA as revealed through scanning electronic microscopy (SEM) and histological studies. The fully developed plants were acclimatized (75% survival rate) and transferred to natural photoperiod conditions. The DNA content and genetic stability of direct regenerated and somatic embryo–derived plants were analyzed by flow cytometry. The 2C DNA content of in vivo plants, direct regenerated, and somatic embryo–derived plants was 14.89, 14.61, and 14.37 pg, respectively. The genetic stability was maintained in in vitro cultures in comparison to field-grown plants of A. maritima. This study for the first time tried to formulate regeneration protocol via direct and indirect organogenesis and somatic embryogenesis for A. maritima. This paper was also the first report for comparing the 2C DNA content of A. maritima grown in vivo to in vitro cultured plants.

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Data Availability

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

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Acknowledgements

The authors are thankful to Dr. Shwetanjali Nimker (Application Scientist) at BD FACS, Jamia Hamdard, New Delhi, for assistance in flow cytometry.

Funding

The first author received research grant no. 191000913 from the University Grants Commission, India.

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All authors contributed to the study conception and design. Material preparation, data collection, and analysis were performed by Neelofer Nabi and Peer Saffeullah. The first draft of the manuscript was written by Neelofer Nabi and all authors commented on previous versions of the manuscript. All authors read and approved the final manuscript.

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Correspondence to Seema Singh.

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Nabi, N., Saffeullah, P. & Singh, S. Micropropagation using direct and indirect organogenesis in Artemisia maritima L.: scanning electron microscopy of somatic embryos and genome size analysis by flow cytometry. In Vitro Cell.Dev.Biol.-Plant 58, 1012–1024 (2022). https://doi.org/10.1007/s11627-022-10291-8

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  • DOI: https://doi.org/10.1007/s11627-022-10291-8

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