Yam (Dioscorea spp.) is a main staple tuber crop in Nigeria and the West African region. Its performance is determined by genotypes and also the environment of growth. This study assessed the agronomic performance and yield stability of elite white yam (Dioscorea rotundata) genotypes across diverse Nigerian environments. A total of 25 genotypes were evaluated at three locations in two consecutive growing seasons, 2022 and 2023, for fresh tuber yield, disease resistance, and tuber quality traits. The genotype’s performance and stability for the measured traits were assessed using various analytical tools such as additive main effects and multiplicative interaction (AMMI) and multi-trait stability index (MTSI). The AMMI analysis revealed significant differences among the genotypes and across the environments for all traits (p < 0.001, p < 0.01). The PCA revealed that the first two principal components (PC1 and PC2) explained a substantial portion of the total variation (49.84%). The MTSI identified four clones: G18, G19, G24, and G16 as promising candidates for improved yam production in Nigeria with high and stable performance for the multiple traits.

Introduction: Yield and food product quality are important attributes in the selection of yam (Dioscorea spp.) cultivars. Among yam-based food products, boiled yam and pounded yam are traditional dishes that hold cultural, nutritional, and sensory significance in regions where yam is a staple food.Materials and methods: This study evaluated the starch, sensory, and textural attributes of boiled and pounded yam products from 25 white Guinea yam (Dioscorea rotundata) genotypes grown across five environments. The sensory quality of both boiled and pounded yam products was assessed through sensory evaluation, while an instrument-based textural profile assay (ITPA) was conducted on pounded yam.Results and conclusion: Environmental influences associated with cropping seasons and locations varied across traits, ranging from 1.4% (adhesiveness) to 20.7% (cohesiveness). Significant positive correlations (p <0.001) were observed between the overall acceptability of pounded yam and its aroma, taste, color, and appearance. Crude starch was positively correlated (p <0.001) with instrumental gumminess, chewiness, and resilience, but negatively with sensory texture, highlighting the need for balanced starch content. Using the log odds ratio analysis method, TDr1741073 was identified as a superior genotype. Similarly, the multi-trait genotype–ideotype distance index (MGIDI) highlighted it as outstanding in both attributes, making it a strong candidate for use as a parent in breeding programs.

This study aimed to assess the agronomic performance and yield stability of elite white yam (Dioscorea rotundata) genotypes across diverse Nigerian environments. Twenty-five genotypes were evaluated at three locations in two consecutive growing seasons, 2022 and 2023. The genotypes were assessed for their agronomic performance, tuber yield and related traits using various analytical tools such as AMMI (Additive main effects and multiplicative interaction) and MTSI (Multi-trait stability index). The AMMI analysis revealed significant differences among the genotypes and across the environ-ments for all traits (p