Abstract
Extensive root development was observed on Stage 2 `Red Emerald' philodendron shoots grown on standard multiplication medium consisting of Murashige and Skoog salts and vitamins with 6-benzylaminopurine (BA, 0.2 mg·liter-1. Root development was suppressed significantly when the level of NH4NO3 was doubled from standard levels (lx, 1650 mg·liter-1) to 3300 mg·liter-1 (2×). A higher level of NH4NO3 (3×, 4950 mg·liter-1) was detrimental to shoot growth and proliferation. This information may be useful for commercial propagators who wish to suppress root development at the shoot multiplication stage.
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