Plant regeneration of Sapindus trifoliatus L. (soapnut) through somatic embryogenesis

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Abstract
Somatic embryogenesis and subsequent formation of plantlets was obtained from callus cultures derived from leaves of mature (over 60years old) Soapnut (Sapindus trifoliatus L.) tree. Callus was induced from leaf explants and grown on Murashige and Skoog's medium supplemented with 2,4-dichlorophenoxy acetic acid (2,4-D) and kinetin. Reduction of 2,4-D concentration during subsequent subcultures resulted in formation of embryoids. These embryoids developed further when transferred to a medium containing benzylaminopurine and kinetin and then to a hormone-free medium. Unless 5-methyl tryptophan was added and the level of sucrose raised, the embryoids began to recallus and failed to form plantlets.