Selection of stable and high-yielding tomato (Solanum lycopersicum L.) genotypes is a challenging issue due to genotype-by-environment interactions. This study aimed to evaluate the yield performance and heritability among 10 tomato putative M7-mutant lines derived from gamma-ray irradiation and five commercial cultivars for agronomic and yield-related traits under two lowland environments, Bogor and Kolaka, Indonesia. Fifteen genotypes incurred evaluation in a randomized complete block design (RCBD) with three replications in each environment. The results revealed that genotype-by-environment interactions significantly influenced the agronomic and yield-related traits of tomatoes. Higher fruit yield per plant and fruit number were prominent at Bogor (1069.63 g plant⁻¹ and 44.08 fruits plant⁻¹) than with Kolaka (434.29 g plant⁻¹ and 18.25 fruits plant⁻¹). It indicated that the Bogor environment was more favorable for tomato growth and yield production. The genotype G7 produced the most fruits per plant in both Bogor and Kolaka (95.58 and 30.81 fruits, respectively). Productivity showed a significant positive correlation with fruit weight and fruit diameter. Maximum broad-sense heritability was evident for plant height and fruit weight. The study revealed the potential of mutant tomato lines for developing high-yielding cultivars adapted to lowland environments.

Keywords: Tomato (S. lycopersicum L.), genotype-by-environment interactions, genetic parameters, heritability, agronomic and yield traits

Key findings: Genotype-by-environment interactions significantly affect the tomato’s (S. lycopersicum L.) fruit yield and its components. Tomato genotypes produced a higher fruit number and yield at Bogor than at Kolaka.