Stability and Broad-sense Heritability of Mineral Content in Potato: Zinc

Abstract

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

Variation in tuber mineral concentrations among accessions of Solanum species held in the Commonwealth Potato Collection

“…This suggests that breeding for high tuber Ca, Fe and Zn concentrations might have potential. Furthermore, the heritability of tuber mineral concentrations in potato were found to be moderately high (Brown et al 2010(Brown et al , 2011(Brown et al , 2012(Brown et al , 2013(Brown et al and 2014Haynes et al 2012;Paget et al 2014;Zorrilla et al 2014), indicating the possibility of mineral biofortification by plant breeding.…”

A comparative study on proximate and mineral composition of coloured potato peel and flesh

“…25 The mineral content of potatoes is an important consideration in evaluation of their role in the human diet. 26 However, no information is available in the literature regarding the mineral element contents of coloured potato peels and flesh.…”

Genetic Evaluation of Micronutrient Traits in Diploid Potato from a Base Population of Andean Landrace Cultivars

“…Models 1 and 2 were equivalent to running univariate analyses for each trait, as all traits are assumed independent with zero covariances and heterogeneous variances. In studies on the variation in potato clones (commercial tetraploid breeding lines and cultivars), Brown et al (2010Brown et al ( , 2011) estimated broad-sense heritabilities and reported significant genetic variation and genotype-byenvironment interaction (GEI) for tuber Fe content, but a scarcity of exploitable variation for Zn tuber content in two out of three trial locations. Summary of phenotypic micronutrient data (mg kg -1 dry wt.)…”

“…There is limited information available in the published literature about the genetic control of micronutrient content in staple crops, including potato, using data from designed crossing trials. In studies on the variation in potato clones (commercial tetraploid breeding lines and cultivars), Brown et al (2010Brown et al ( , 2011) estimated broad-sense heritabilities and reported significant genetic variation and genotype-byenvironment interaction (GEI) for tuber Fe content, but a scarcity of exploitable variation for Zn tuber content in two out of three trial locations. A study by Haynes et al (2012) on S. tuberosum ´ (S. phureja-S. stenotomum) 4´-2´ clones found significant levels of genetic variation for a number of micronutrients and a GEI for Zn.…”