Plant Growth Regulation

, Volume 38, Issue 3, pp 279–285

In vitro plantlet regeneration from cotyledons of the tree-legume Leucaena leucocephala


DOI: 10.1023/A:1021591212710

Cite this article as:
Saafi, H. & Borthakur, D. Plant Growth Regulation (2002) 38: 279. doi:10.1023/A:1021591212710


Two plant regeneration methods applicable to Leucaenaleucocephala were developed. In the first method, involvingorganogenesis via callus formation, cotyledon, hypocotyl and root segments wereinitiated on MS medium containing different concentrations ofN6-benzyladenine (BA), 2,4-dichlorophenoxyacetic acid (2,4-D), andnaphthaleneacetic acid (NAA). Both compact (type I) and friable (type II) calliwere obtained from the cotyledon and hypocotyl explants treated with differentconcentrations of the growth regulators. Shoots were generated only from thefriable calli formed from the cotyledon explants. The calli formed from thehypocotyl explants did not generate shoots and the root explants died withoutforming callus. Cotyledon explants from 3–4 day old seedlings showedmaximum callus induction compared to those from older seedlings. In a secondmethod involving direct organogenesis, excised cotyledons were cultured on 1/2MS medium containing 10–35 mg l−1N6-benzyladenine (BA) for 7–14 days. Transfer of thecotyledonsto regeneration medium containing low BA resulted in callus formation andsubsequent shoot regeneration from the base of the excised cotyledon explants,with up to 100% frequency. Regenerated shoots rooted best on a basal mediumcontaining no growth regulators.

Callus Leucaena leucocephala Organogenesis Tissue culture 


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Copyright information

© Kluwer Academic Publishers 2002

Authors and Affiliations

  1. 1.Department of Molecular Biosciences and BioengineeringUniversity of HawaiiHonoluluUSA

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