Abstract
A protocol for induction of direct somatic embryogenesis and subsequent plant regeneration for the medicinally important and endangered plant Paris polyphylla Sm. has been developed for the first time. Immature zygotic embryos (IZEs) were cultured on different media namely Gamborg (B5), ½ B5, Murashige and Skoog (MS), ½ MS, Chu et al. (N6), ½ N6, Schenk and Hildebrandt (SH) and ½ SH. Highest frequency of somatic embryogenesis (32.6 %) and mean number of somatic embryos (SEs) per explant (28.7 ± 1.7) were obtained on ½ MS medium directly without an intermediate callus phase. The frequency of SE induction was significantly increased to 40.7 % when ½ MS medium was solidified with gelrite compared to agar (32.6 %). Secondary somatic embryos (SSEs) appeared on the primary SEs in a repetitive way on plant growth regulator-free ½ MS medium but with a gradual decrease in embryogenic potential during subsequent subcultures. Plasmolyzing pre-treatment of SSEs with 1.0 M mannitol for 12 h effectively maintains its embryogenic capacity. Primary embryos at the elongated dimpled and early cotyledonary stage displayed the highest embryo forming capacity of 26.94 and 27.87, respectively. High frequency of SE germination (94.0 %) occurred on ½ MS medium with 0.5 mg/l gibberellic acid. Highest percentage of seedling to plantlet conversion was observed in the medium supplemented with 0.05 mg/l 6-benzylaminopurine and 0.1 mg/l α-naphthalene acetic acid. Regenerated plants displayed morphological characteristics similar to that of the wild plants. Flow cytometry analysis showed ploidy stability of the regenerated plants.
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Abbreviations
- BAP:
-
6-Benzylaminopurine
- B5:
-
Gamborg et al.
- 2,4-D:
-
2,4-Dichlorophenoxyacetic acid
- EFC:
-
Embryo forming capacity
- GA3 :
-
Gibberellic acid
- IZE:
-
Immature zygotic embryo
- MS:
-
Murashige and Skoog
- NAA:
-
α-Naphthaleneacetic acid
- N6:
-
Chu et al.
- PGRs:
-
Plant growth regulators
- SE:
-
Somatic embryo
- SH:
-
Schenk and Hildebrandt
- SSE:
-
Secondary somatic embryo
- ZE:
-
Zygotic embryo
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Acknowledgments
The authors acknowledge Prof. N. Venugopal, Head, Department of Botany, North-Eastern Hill University (NEHU), Shillong for permission to use microtome and staff of Sophisticated Analytical Instrumentation Facility (SAIF) for technical assistance in SEM. The authors would like to thank Prof. A. Chatterjee and D. Tripathi from Department of Biotechnology and Bioinformatics, NEHU for access to the FACS instrumentation facility. SR is thankful to University Grant Commission, India for awarding her Rajiv Gandhi National Fellowship for SC/ST candidate.
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Raomai, S., Kumaria, S. & Tandon, P. Plant regeneration through direct somatic embryogenesis from immature zygotic embryos of the medicinal plant, Paris polyphylla Sm.. Plant Cell Tiss Organ Cult 118, 445–455 (2014). https://doi.org/10.1007/s11240-014-0496-2
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DOI: https://doi.org/10.1007/s11240-014-0496-2