Iron deficiency in humans occurs in all regions of the world. Potatoes are a modest source of iron. The purpose of this study was to determine if genetic variation for potato tuber iron content exists. Iron content in unpeeled potato was measured in 33 clones, including varieties and advanced breeding selections, in three trials (Tri-State, Western Regional Russet, Western Specialty/Red) which in total were grown in twelve environments. In two trials significant genotype × environment interaction occurred. Thirteen clones contributed significantly to this genotype × environment interaction, making them unstable across environments, including the variety Russet Burbank. Broad-sense heritabilities and their 95% confidence intervals (in parentheses) in the Tri-State, Western Regional Russet and Western Specialty/Red Trials were 0.00 (0.00, 0.38), 0.64 (0.17, 0.87), and 0.73 (0.25, 0.90), respectively. Overall the range of mean iron content on a clonal basis was 17 to 62 ug per gram dry weight. The upper limit is three times higher than generally reported values of potato. The five highest values were found in the Western Specialty/Red trial and were red-skinned, white-fleshed clones. These results suggest that genetic variation for tuber iron content exists and that breeding for enhanced iron content would be feasible.Resumen La deficiencia de hierro en humanos se presenta en todas las regiones del mundo. Las papas son una fuente modesta de hierro. El propósito de este estudio fue determinar si existe variación genética del contenido de hierro en el tubérculo de papa. Se midió el contenido de hierro en papa sin pelar de 33 clones, incluyendo variedades y selecciones avanzadas, en tres ensayos (TriState, Russet Regional del Oeste, Especialidades Rojas del Oeste) que en total se cultivaron en doce ambientes. En dos ensayos se presentó una interacción significativa clon × ambiente. Trece clones contribuyeron significativamente a esta interacción clon × ambiente, haciéndolas inestables en los ambientes, incluyendo la variedad Russet Burbank. Las heredabilidades en un amplio sentido y su intervalo de confianza de 95% (en paréntesis) en Tri-State, Russet Regional del Oeste y Especialidades Rojas del Oeste fueron 0.00 (0.00, 0.38), 0.64 (0.17, 0.87), y 0.73 (0.25, 0.90), C. R. Brown (*) respectivamente. En general, la amplitud de la media en el contenido de hierro con base clonal fue de 17 a 62 ug por gramo de peso seco. El límite superior es tres veces más alto que lo que generalmente se reporta en valores de papa. Los cinco valores más altos se encontraron en el ensayo de Especialidades Rojas del Oeste, en clones de piel roja y pulpa blanca. Estos resultados sugieren que existe la variación genética para el contenido de hierro en el tubérculo y que pudiera ser posible el mejoramiento para aumentar el contenido de hierro.

The mineral content of potato is an important consideration in the evaluation of its role in the human diet. Zinc content is vital due to its crucial role as a micronutrient. Zinc deficiency occurs among the poorest of the world's populations. In this study, 36 breeding lines and varieties (genotypes) were divided among three trials (Tri-State, Western Regional Russet and Western Specialty/Red) which were grown in 11 locations. Zinc content was measured in harvested tubers by wet ashing and passage through an Inductively Coupled Argon Plasma Emission Spectrophotometer Genotype mean zinc content ranged from 12 to 18 μg g −1 dry weight over all trials. In two of the three trials there were no significant differences among genotypes for zinc. Broad sense heritabilities for zinc content were small in these two trials. In the Western Regional Russet Trial there were significant differences among genotypes and the heritability was 0.61, suggesting that genotypes with higher zinc content could be selected. However, the largest zinc value was only 50% above the lowest value. Furthermore, a 100 g serving of the highest zinc genotype would only provide 4% of the adult Estimated Average Requirement From these results, potato from this breeding pool would not appear to be a good candidate for biofortification of zinc through traditional breeding. Higher values from other studies suggest that zinc biofortification through breeding may be warranted in potato for populations with high potato consumption and high risk for zinc deficiency in the Andes of South America.Resumen El contenido mineral de la papa es de consideración importante en la evaluación de su papel en la dieta humana. El contenido de zinc es vital debido a su desempeño como micronutriente. La deficiencia de zinc se presenta entre las poblaciones más pobres del mundo. En este estudio, se dividieron 36 líneas de mejoramiento y variedades (genotipos) en tres ensayos (Tres-Estados, Russet Regional del Oeste y especialidad roja del oeste) establecidos en 11 localidades. En los tubérculos cosechados se midió el contenido de zinc por cenizas húmedas y pasando a través de un Espectrofotómetro Acoplado

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