Subhasisa Bal, Sillma Rampadarath, Debasis Dash, Rabindra Kumar Mishra and Nilamadhaba Sasmal Wild species, introgression lines, yield, yield components 10-20 1 (1) 2017 August,2017 Introgression lines (IL) from crosses between elite cultivars and wild species are important resources for mapping quantitative trait loci (QTLs) for yield. In order to evaluate the relationship between morphological characters and yields in rice, 25 ILs (KMR3 × Oryza rufipogon) at BC₄F₆ generation were grown during Rabi 2014. Transgressive segregations were observed for most traits. The results suggested that genetic variation for these traits were largely controlled by additive genes. Statistical analysis on important agronomic traits showed that maximum standard deviation belonged to the total grain number per plant followed by number of grains per panicle and grain yield per plant. Grain yield per plant was positively correlated and was significant to tiller number, number of panicle per plant, number of grains per panicle and grain weight per panicle. This study revealed that selection based on total number of grains per panicle, grain weight per panicle and panicle per plant will be highly effective for yield improvement in rice breeding programs. Overall, there was high genetic variation which promised high rate of arising elite transgressive individuals and moderate heritability for most traits in the populations tested. It is feasible and efficient to use wild rice abundant genetic diversity to develop rice cultivars for high yield.