Combining Ability and Heterosis Study for Fibre Yield and Yield Attributing Characters in Tossa Jute (Corchorus olitorius L)

Present study was carried out to estimate combining ability and heterosis for fibre yield and yield attributing characters among diverse tossa jute germplasm lines and in 21 F₁ hybrids derived from 7x7 half diallel mating design. Analysis of variance revealed significance of parent's vs hybrids for most of the characters indicating presence of heterosis. High gca effects for fibre yield, plant height and green weight was recorded by OIN-255. High significant sea effects for fibre yield were recorded in OMU-19 x OMU-27 (19.53") and OIN-255 x OEX-32 (15.50") crosses. Variances for general combining ability and specific combining ability were significant for few characters indicating additive and non-additive gene actions for those characters. High standard heterosis for fibre yield was recorded by OMU-19 x OMU-27 (41.01") and OIN-255 x OEX-32 (32.47") crosses. Genetic parameters indicated that plant height, green weight and stick weight were controlled by additive gene action and basal diameter and fibre yield controlled by non-additive gene action.