biologia plantarum

International journal on Plant Life established by Bohumil Němec in 1959

Biologia plantarum 52:743-748, 2008 | DOI: 10.1007/s10535-008-0144-y

In vitro regeneration of Leucaena leucocephala by organogenesis and somatic embryogenesis

S. Rastogi1, S. M. H. Rizvi2,*, R. P. Singh2, U. N. Dwivedi3
1 Department of Biotechnology, Integral University, Lucknow, India
2 Department of Biosciences, M.D. University, Rohtak, Haryana, India
3 Department of Biochemistry, Lucknow University, Lucknow, India

In the present study, in vitro regeneration system for a recalcitrant woody tree legume, Leucaena leucocephala (cvs. K-8, K-29, K-68 and K-850) from mature tree derived nodal explants as well as seedling derived cotyledonary node explants was developed. Best shoot initiation and elongation was found on full-strength Murashige and Skoog (MS) medium supplemented with 3 % (m/v) sucrose, 100 mg dm-3 myoinositol, 100 mg dm-3 glutamine, 20.9 µM N 6-benzylamino-purine (BAP) and 5.37 µM 1-naphthalene acetic acid (NAA). Rooting was induced in half-strength MS medium containing 2 % (m/v) sucrose, 100 mg dm-3 myoinositol, 14.76 µM indole-3-butyric acid (IBA) and 0.23 µM kinetin. The cultivar K-29 gave the best response under in vitro conditions. Rooted plantlets were subjected to hardening and successfully transferred to greenhouse. Further, somatic embryogenesis from nodal explants of cv. K-29 via an intermittent callus phase was also established. Pronounced callusing was observed on full-strength MS medium containing 3 % (m/v) sucrose, 100 mg dm-3 myoinositol, 40.28 µM NAA and 12.24 µM BAP. These calli were transferred to induction medium and maximum number of globular shaped somatic embryos was achieved in full-strength MS medium fortified with 3 % (m/v) sucrose, 100 mg dm-3 myoinositol, 15.0 µM 2,4-dichlorophenoxyacetic acid (2,4-D), 5.0 µM BAP and 1.0 mM proline. Moreover, an increase in endogenous proline content up to 28th day of culture in induction medium was observed. These globular shaped somatic embryos matured in full-strength MS medium with 3 % (m/v) sucrose, 100 mg dm-3 myoinositol, 10.0 µM BAP, 2.5 to 5.0 µM IBA and 0.5 mM spermidine.

Keywords: callus; root induction; shoot formation and multiplication; subabul; tissue culture; tree legume
Subjects: in vitro culture, callus; in vitro culture, regeneration; in vitro culture, rooting; in vitro culture, somatic embryogenesis; Leucaena leucocephala; nutrient medium, Murashige and Skoog (MS)

Received: February 6, 2007; Accepted: August 25, 2007; Published: December 1, 2008  Show citation

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Rastogi, S., Rizvi, S.M.H., Singh, R.P., & Dwivedi, U.N. (2008). In vitro regeneration of Leucaena leucocephala by organogenesis and somatic embryogenesis. Biologia plantarum, 52(4), 743-748. doi: 10.1007/s10535-008-0144-y
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