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A Method for Intercultivar Comparison of Potato Tuber Nutrient Content Using Specific Tissue Weight Proportions

Authors

  • E. Ortiz-Medina,

    1. Authors Ortiz-Medina and Donnelly are with Plant Science Dept. and authors Sosle and Raghavan are with Bioresource Engineering Dept., McGill Univ., 21,111 Lakeshore Rd., Ste. Anne de Bellevue, QC, Canada, H9X 3V9. Direct inquiries to author Donnelly (E-mail: danielle.donnelly@mcgill.ca).
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  • V. Sosle,

    1. Authors Ortiz-Medina and Donnelly are with Plant Science Dept. and authors Sosle and Raghavan are with Bioresource Engineering Dept., McGill Univ., 21,111 Lakeshore Rd., Ste. Anne de Bellevue, QC, Canada, H9X 3V9. Direct inquiries to author Donnelly (E-mail: danielle.donnelly@mcgill.ca).
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  • V. Raghavan,

    1. Authors Ortiz-Medina and Donnelly are with Plant Science Dept. and authors Sosle and Raghavan are with Bioresource Engineering Dept., McGill Univ., 21,111 Lakeshore Rd., Ste. Anne de Bellevue, QC, Canada, H9X 3V9. Direct inquiries to author Donnelly (E-mail: danielle.donnelly@mcgill.ca).
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  • D.J. Donnelly

    1. Authors Ortiz-Medina and Donnelly are with Plant Science Dept. and authors Sosle and Raghavan are with Bioresource Engineering Dept., McGill Univ., 21,111 Lakeshore Rd., Ste. Anne de Bellevue, QC, Canada, H9X 3V9. Direct inquiries to author Donnelly (E-mail: danielle.donnelly@mcgill.ca).
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Abstract

ABSTRACT:  Potato tubers are a staple food item in the North American diet. Each potato cultivar has unique tuber appearance and nutritional composition. A method was developed to facilitate better cultivar selection for dietary purposes and obtain a better understanding of the nutrient distribution within specific tissues of potato tubers. This involved a procedure for estimating the percent weight contribution of the 3 major tissue components, including periderm or “skin,” cortex, and pith for 20 potato cultivars. Weight determination was based on the volume (calculated through an ellipsoid formula) and density of each component tissue. Calculated percent weight and dry matter data for each tuber tissue provided conversion factor values that were tabulated for all cultivars. An example is provided to illustrate the application of this procedure in facilitating identification of cultivars with significantly greater or lesser protein content.

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