Enhanced shoot multiplication in Ficus religiosa L. in the presence of adenine sulphate, glutamine and phloroglucinol.

Abstract

Ficus religiosa (Pipal) is a long-lived valuable multipurpose forest tree. The tree is exploited because of its religious, ornamental and medicinal value and the regeneration rate in natural habitat is low. An in vitro propagation protocol has been developed from nodal segments obtained from a 45-50-year old tree. The highest bud break frequency (100 %) followed by maximum number of multiple shoots (13.9) as well as length (2.47cm) were obtained on Woody Plant medium (WPM) supplemented with 1.0mg/l BAP along with 0.5mg/l IAA. Two modifications in this medium resulted in enhanced shoot regeneration-one with 200mg/l glutamine + 150mg/l ADS (called as MM-1) giving 32.5 shoots per nodal explant while another modification-with 200mg/l glutamine + 150mg/l ADS + 100mg/l phloroglucinol (called as MM-2) giving 35.65 shoots per explant. These two media were used for sub-culturing of shoots for 4months. The rate of shoot multiplication was same during the first three sub-cultures on MM-1 and the shoots regenerated were healthy, afterwards shoot multiplication declined. While on MM-2, shoot multiplication declined after first sub-culture and shoots underwent the problem of early leaf fall. Rooting was best induced in micro-shoots excised from proliferated shoot cultures on semi-solid as well as liquid WPM modified with 2.0mg/l IBA and 0.5mg/l IAA. The in vitro-raised plantlets were potted and acclimatized under culture room conditions for 25-30days before transfer to soil conditions, where the established plants showed more than 90 % survival.