World population is increasing day by day with an exponential rate while cultivated land area is decreasing. Such an immense increase in human population requires more food per unit area. This can only be achieved by producing high yielding crop varieties. Current experimental study was conducted at Research area of Department of Plant Breeding and Genetics, University of Agriculture, Faisalabad to disclose relationship between different spike -related traits and grain yield. The experimental material was comprised of 47 spring wheat genotypes including 35 approved varieties and 12 elite wheat lines. The experiment was conducted in Randomized Complete Block Design with three replications. At maturity, data were collected for plant height, tillers per plot, grain filling period, spike length, spikelets per spike, spike density, spike weight, thousand grain weight, grain weight per spike, number of grains per spike, harvest index, biological yield and grain yield per plot. Results revealed that number of tillers per meter, spike weight, thousand grain weight, grain weight per spike, harvest index and biological yield per meter had a positive and significant relationship with grain yield at both genotypic and phenotypic level. Path analysis showed that the direct effects of plant height, number of tillers per meter, thousand grain weight, grain weight per spike and number of grains per spike were negative. Biplot analysis revealed that thousand grain weight, spike weight and biological yield could be used as selection criteria. The results suggested that spike weight, harvest index and biological yield could be used as selection criteria while selecting high yielding genotypes for future use in hybridization programs. Promising wheat line, PB9881 performed best among studied genotypes and could be released as commercial variety. FD83, Punjab-11 and PB9881 could be used in future breeding programs for improvement in grain yield.
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