Stockplant Management for Optimized Rhizogenesis in Tectona grandis Stem Cuttings

New Forests (Impact Factor: 1.64). 12/2005; 31(1):91-96. DOI: 10.1007/s11056-004-7361-9

ABSTRACT A 5-year stand of teak (Tectona grandis L. f.) was coppiced in 1999 and converted into a vegetative multiplication garden. Subsequently, three harvesting regimes
for the collection of single node stem cuttings were imposed: (1) once – in March (H1), (2) twice – in March and September (H2) and (3) three times in March, July and November (H3). Cuttings were treated basally with either:- T0 – control (6h in water), T1 – half the recommended dose of a mixture of IBA and thiamine (500ppm IBA +400ppm thiamine) or T2 – the full dose of the same mixture (1000ppm IBA +800ppm thiamine). Cuttings receiving IBA +thiamine rooted significantly
better than untreated cuttings, but even the best treatment only resulted in 38.3±3.8% rooting. This treatment produced
the greatest number of roots (5.2–12.1). The full dose treatment appears to have been supra-optimal. Rooting ability was also
affected by the frequency of stockplant pruning, with cuttings from stockplants pruned twice per year having the greatest
rooting percentage (27.8±3.8%) and the most roots (9.2±4.8). This bi-annual pruning (H2) resulted in the greatest number of rooted propagules (2.6 and 4.2 times more than H1 and H3, respectively). There was a significant interaction between Treatment×Pruning frequency. Bi-annual hedging of teak stockplants
is recommended for practical purposes, although further work is required to achieve commercially acceptable levels of rooting
from coppiced tree stumps.

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