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Item Effect of plant growth substances on the in vitro propagation of jack (Artocarpus Heterophyllus Lam.)(Kerala Agricultural University, 1988) Rajmohan, K; Mohanakumaran, NExplants from shoot apices of fresh stem sprouts of five-year old jack (Artocarpusheterophyllus Lam.) trees registered a multiplication rate of 4.5 x. when cultured for five weeks on MS proliferation medium containing BA (5 mg/l) and NAA (0.2 mg/l). The normal strength of inorganic salts and organic growth factors of the MS medium, with 30—40 g/l of sucrose or 20—30 g/l of glucose was found to support the multiplication and growth of the cultures. GAa did not influence the shoot proliferation or growth. Adenine sulphate at 20 mg/l was found to increase the multiplication rate by 27.3 per cent, without