Abstract
Somatic embryos regenerated in high-frequency (up to 100 %) on immature cotyledons of Azadirachta indica at a low concentration of thidiazuron (TDZ; 0.5 μM). Regeneration occurred exclusively from abaxial surface. Frequency of regeneration declined with the age of the cotyledons: on semimature cotyledons regeneration occurred only from some regions of the abaxial surface and on mature cotyledons it was confined to corners. However, an increase in concentration of TDZ to 1.0 μM improved the regeneration response. Higher regenerative capacity of immature cotyledons was due to presence of milk in immature fruits because regeneration response of immature cotyledons declined on washing of cotyledons for 24 h in liquid medium, and milk from immature fruits augmented the regeneration response of mature cotyledons. Somatic embryos regenerated readily on hormone-free medium and plantlets derived were able to survive after transfer to soil.
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Abbreviations
- AzM:
-
azadirachta milk
- BAP:
-
6-benzylaminopurine
- CM:
-
coconut milk
- 2,4-D:
-
2,4-dichlorophenoxyacetic acid
- MS medium:
-
Murashige and Skoog medium
- NAA:
-
naphthalene acetic acid
- TDZ:
-
thidiazuron
References
Baker, C.M., Wetzstein, H.Y.: Influence of auxin type and concentration on peanut somatic embryogenesis.-Plant Cell Tissue Organ Cult. 36: 361–368, 1994.
Bates, S., Preece, J.E., Navarrete, N.E., Sambeek, J.W. Van Gaffney, G.R.: Thidiazuron stimulates shoot organogenesis and somatic embryogenesis in white ash (Fraxinus americana L.).-Plant Cell Tissue Organ Cult. 31: 21–29, 1992.
Bobák, M., Šamaj, J., Hlinková, E., Hlavačka, A., Ovečka, M.: Extracellular matrix in early stages of direct somatic embryogenesis in leaves of Drosera spathulata.-Biol. Plant. 47: 161–166, 2003/4.
Choi, Y.E., Yang, D.C., Yoon, E.S., Choi, K.T.: High-efficiency plant production via direct somatic single embryogenesis from preplasmolysed cotyledons of Panax ginseng and possible dormancy of somatic embryos.-Plant Cell Rep. 18: 493–499, 1999.
Compton, M.E., Gray, D.J.: Somatic embryogenesis on immature cotyledons of watermelon.-In Vitro cell dev. Biol. Plant 28: 98A, 1992.
D’Onofrio, C., Morini, S.: Simultaneous regeneration of different morphogenic structures from quince leaves as affected by growth regulator combination and treatment length.-Biol. Plant. 47: 321–325, 2003/4.
Gill, R., Saxena, P.K.: Direct somatic embryogenesis and regeneration of plants from seedlings explants of peanut (Arachis hypogaea): promotive role of thidiazuron.-Can. J. Bot. 70: 1186–1192, 1992.
Merkle, S.A., Wetzstein, H.Y., Sommer, H.E.: Somatic embryogenesis in tissue cultures of pecan.-Hort. Sci. 22: 128–130, 1987.
Murashige, T., Skoog, F.: A revised medium for rapid growth and bioassays with tobacco tissue culture.-Physiol. Plant. 15: 473–497, 1962.
Murthy, B.N.S., Saxena, P.K.: Somatic embryogenesis and plant regeneration of neem (Azadirachta indica A. Juss.).-Plant Cell Rep. 17: 469–475, 1998.
Neuman, M.C., Preece, J.E., Sambeek, J.W., Van Gaffney, G.R.: Somatic embryogenesis and callus production from cotyledon explants of eastern black walnut.-Plant Cell Tissue Organ Cult. 32: 9–18, 1993.
Peshke, V.N., Phillips, R.L.: Genetic implications of somaclonal variation in plants.-Adv. Genet. 30: 41–75, 1992.
Preece, J.E., Christ, P.H., Ensenberger, L., Zhao, J.: Micropropagation of ash (Fraxinus).-Combined Proc. int. Plant Propag. Soc. 37: 366–372, 1987.
Raghavan, V.: Somatic embryogenesis.-In: Raghavan, V. (ed.): Molecular Embryology of Flowering Plants. Pp. 467–499. Cambridge University Press, Cambridge-New York 1997.
Salvi, N.D., Singh, H., Tivarekar, S., Eapen, S.: Plant regeneration from different explants of neem.-Plant Cell Tissue Organ Cult. 65: 159–162, 2001.
Tulecke, W., McGrahanan, G.: Somatic embryogenesis and plant regeneration from cotyledons of walnut.-Plant Sci. 40: 57–63, 1985.
Wetherhead, M.A., Burdon, J., Henshaw, G.G.: Some effects of activated charcoal as an additive to plant tissue culture media.-Z. Pflanzenphysiol. 89: 141–147, 1978.
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Gairi, A., Rashid, A. Direct differentiation of somatic embryos on cotyledons of Azadirachta indica . Biol Plant 49, 169–173 (2005). https://doi.org/10.1007/s10535-005-0173-8
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DOI: https://doi.org/10.1007/s10535-005-0173-8