Effect of Growth Promoting Substances and Rhizome Separation Technique on Clonal Propagation of Bambusa vulgaris var. striata

A nursery trial has been carried out at Institute of Forest Productivity, Lalgutwa, Ranchi to assess the direct and residual effect of different growth promoting hormones (IAA, IBA, NAA and Boric Acid) individually and in combination on clonal propagation of Bambusa striata . Double node cuttings of 1 to 2 yr old culms have been used to study the shoot - root development and rhizome genesis during propagation. Subsequent propagation of the developed BPS raised from culm segments having intact and detached (segregated by splitting) rhizome system in poly pots containing soil:sand:FYM at 2:1:1 ratio have also been studied for another 180 days. Phytohormones did not show any positive influence on rooting and rhizome genesis in culm cuttings of B. striata . Culming intensity from intact rhizome system has been slightly more than from segregated rhizome system. However, from the latter, double number of BPS of almost identical vigor can be raised within same nursery gestation period. Boric acid and combined hormone mixture have shown positive effect on new culm recruitment both in the intact and detached form of the propagules through producing more number of rhizomes. The combination of these hormones also favoured positive results in increasing culm length.