Abstract
Young healthy cotyledon and leaf explants of Rhinacanthus nasutus (L.) Kurz. were incubated on Murashige and Skoog (MS) medium supplemented with 1.0–5.0 mg/l 2, 4-dichlorophenoxyacetic acid (2,4-D) either alone or in combination with 0.3–1.5 mg/l indole-3-butyric acid (IBA). The optimum callus induction (100 %) was observed from cotyledon explants on MS medium supplemented with 4 mg/l 2, 4-D and 0.5 mg/l IBA. The friable, embryogenic callus when subcultured on half strength MS medium supplemented with IBA (3.0–5.0 mg/l) produced several somatic embryos at various stages of development (globular, heart, torpedo) after 45 days of culture. The highest frequency of callus embryogenesis was observed on ½MS medium supplemented with 4.0 mg/l IBA. Moreover, 47 % of incubated callus responded with a mean number of 16.3 somatic embryos per gram callus. For germination, somatic embryos at the torpedo stage were isolated and subcultured on ½MS medium supplemented with 0.5 mg/l each of 6-benzyladenine and indole-3-acetic acid. After 45 days of culture, plantlets developed with mean lengths of 3.8 cm. Somatic embryos at the torpedo stage were collected and suspended in a matrix of MS medium containing sodium alginate (3 % W/V), dropped into 100 mM calcium chloride (CaCl2·2H2O) solution for the production of synthetic seeds. Optimum growth ability of synthetic seed was obtained on MS medium supplemented with 0.2 mg/l gibberellic acid (GA3). Well developed healthy plantlets derived from somatic embryos and synthetic seeds were hardened and successfully transplanted to soil.
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Abbreviations
- 2, 4-D:
-
2, 4-dichlorophenoxyacetic acid
- BA:
-
6-Benzyladenine
- GA3 :
-
Gibberellic acid
- IAA:
-
Indole-3-acetic acid
- IBA:
-
Indole-3-butyric acid
- Kn:
-
Kinetin
- MS:
-
Murashige and Skoog medium
- NAA:
-
1-Naphthalene acetic acid
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Acknowledgments
MKC is thankful to M.G. University, Kottayam, Kerala, India for the financial assistance in the form of Junior Research Fellowship and to the Principal, St. Thomas College, Pala for providing all the laboratory facilities. TDT acknowledges the financial assistance from UGC in the form of a major research project (Project no. 38-233/2009).
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Cheruvathur, M.K., Kumar, G.K. & Thomas, T.D. Somatic embryogenesis and synthetic seed production in Rhinacanthus nasutus (L.) Kurz.. Plant Cell Tiss Organ Cult 113, 63–71 (2013). https://doi.org/10.1007/s11240-012-0251-5
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DOI: https://doi.org/10.1007/s11240-012-0251-5