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Regeneration of plants through somatic embryogenesis in Thymus hyemalis Lange, a potential medicinal and aromatic plant

  • Developmental Biology/Morphogenesis
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Abstract

A protocol for somatic embryogenesis was developed for Thymus hyemalis, a wild species in the Mediterranean region. First, the effects of explant type, plant growth regulators [kinetin (KIN) and 2,4-dichlorophenoxyacetic acid (2,4-D)], and genotype on callus induction were tested. For callus induction, the node was the best explant; Murashige and Skoog (MS) medium supplemented with 1.8 μM 2,4-D and 0.5 μM KIN was the best medium, and the genotype had a highly significant effect. To induce production of somatic embryos, the effects of KIN, 6-benzylaminopurine (BAP), and naphthalene acetic acid (NAA) were evaluated. After 5 wk of culture in the dark, MS medium supplemented with 4.44 μM BAP, 0.54 μM NAA, and 4.65 μM KIN gave the highest percentage (85%) of embryogenic callus and the highest number of somatic embryos (27.00) per 45 mg of callus. For germination and plant recovery, somatic embryos were transferred to MS medium without plant growth regulators and plantlet conversion from developed somatic embryos was 90%. In vitro plants with adequate growth and sufficient root systems were subsequently transplanted into a mixture of peat and vermiculite (2:1 v/v) under greenhouse conditions. The survival rate of the plantlets under ex vitro conditions was 80%.

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Acknowledgments

We thank the Bni Boufrah association for providing seeds and Dr. A. Ennabili for identification of the botanical name of Thymus species. We also thank Drs. S. M. Udupa and D. Iraqi for their help. This research program was supported by the National Institute of Medicinal and Aromatic Plants, Taounate, Morocco.

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Correspondence to A. Nordine.

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Editor: Frans Krens

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Nordine, A., Tlemcani, C.R. & El Meskaoui, A. Regeneration of plants through somatic embryogenesis in Thymus hyemalis Lange, a potential medicinal and aromatic plant. In Vitro Cell.Dev.Biol.-Plant 50, 19–25 (2014). https://doi.org/10.1007/s11627-013-9577-x

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