Author(s): S. K. DUTTA, S. ROY CHOWDHUR, D. PANDIT, P.C.BOSE AND A. K. BAJPAI

Abstract: To study the rooting behaviour of Som plant (Persea bombycina) with increased propagation efficiency, application of growth regulators was tried so as to multiply the morphotypes maintaining its desirable characters and quality for muga silkworm (Antheraea assamensis) rearing. S6 morphotype of som plant (Plate-Il) was studied for propagation efficiency. Data recorded on survival of cuttings after 55 days and 90 days of plantation revealed that regeneration efficiency was 13% in cuttings without use of growth regulator,while survival was 50.6% in IAA (300 ppm), 60.3% in IBA (300 ppm) and 61.6% in Arodix. Survival of cuttings was recorded higher and survivality was 7.3% in IBA, 4% in IAA and 9.7% in Arodix, showing disintegration of cuttings after formation of roots. Use of growth regulators i.e., Arodix as root promoter and N-Triacontanol for shoot elongation, showed 78.6% survival of cuttings with the gain of 1.7% in rooting and survivability. In mass multiplication, the method showed 77.06% and 81.06% cuttings survival during 2004-05 and 2005-06, respectively.

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