Abstract

Tomato (Solanum lycopersicum L.) is one of the most economically important vegetable crops globally, ranking second after potato in production. Despite its significance, tomato yield in Pakistan remains low (≈ 9 t ha⁻¹) compared to global averages (~ 37 t ha⁻¹). This study aimed to evaluate genetic variability, heritability, and correlations among yield-related traits in thirteen tomato genotypes under field conditions. The experiment was conducted in a Randomized Complete Block Design (RCBD) with three replications. Data were collected for sixteen quantitative traits, including days to flowering, fruit weight, plant height, and yield per plant. Analysis of variance revealed significant genotypic differences for most traits. High genotypic coefficient of variation (GCV) and phenotypic coefficient of variation (PCV) were observed for fruit weight, number of fruits per plant, and yield per plant, indicating substantial genetic variability. Broad-sense heritability estimates were high (>60%) for fruit weight, plant height, and pericarp thickness, suggesting additive gene action. Correlation analysis revealed that fruit weight and number of fruits per plant had a significant positive association with yield. The findings suggest that selection based on these traits could enhance tomato yield in breeding programs.