An investigation was conducted to study the performance of different genotypes in jack fruit (Artocarpus heterophyllus Lam.) during 2016-2017 at Department of Horticulture, Faculty of Agriculture, Annamalai University. Twelve genotypes viz., AH-1 to AH-12 were used in the investigation. Based on the germination percentage and seed vigour, AH-5 was identified as best genotype for rootstock. In order to increase seedling vigour the seeds of AH-5 were treated with bioregulators viz., NAA (100 ppm, 200 ppm,300 ppm and 400ppm) and IBA (100 ppm, 200 ppm, 300 ppm and 400 ppm.). Among nine treatments soaking of seeds for 24 hours in 400 ppm of IBA gave superior performance. Significant interactions were observed for germination per cent, plant height, number of leaves, leaf length, leaf breadth and stem girth etc. The best growth attributes were observed in AH-5 which recorded higher germination percentage, plant height, number of leaves, leaf length, leaf breadth and stem girth. Among the different age of rootstocks tried for softwood grafting, maximum graft union success was recorded in 150 days old rootstocks and it was followed by 120 days old rootstocks.
