An improved protocol for adventitious shoot regeneration and plant formation in Psoralea corylifolia L.

An effective protocol was developed for in vitro regeneration of Psoralea corylifolia through enriched cotton moistened-liquid (CML) and solid culture systems. Prolific adventitious shoot buds were achieved from hypocotyl explants of 2-week-old cultures on enriched CML Phillips and Collins (L2) medium supplemented with different concentrations and combinations of thidiazuron (TDZ), benzyladenine (BA), kinetin (KIN), naphthalene acetic acid (NAA), indole-3-acetic acid (IAA) and bavistin (BVN). Combination of 2 μM TDZ, 0.5 μM BA, 100 mg l−1 BVN and 2 μM NAA produced a greater number of adventitious shoots per explant (93.5) when transferred to half-strength enriched solid L2 medium. Regenerated shoots (40-50 mm in length) were exposed simultaneously for rooting as well as hardening in moistened (1/8-L2 basal salt solution with 5 μM IBA and 100 mg l−1 BVN) soil mixture and vermiculite (3:1, v/v). The plants were subsequently established in the field. The survival percentage differed with seasonal variations.