Submitted to: National Sweetpotato Collaborators Group Progress Report
Publication Type: Other
Publication Acceptance Date: January 21, 2011
Publication Date: January 22, 2011
Citation: Jackson, D.M. 2011. Sweetpotato Color Analyses. National Sweetpotato Collaborators Group Progress Report, Page 7 In K. Pecota (ed.), 2010. Technical Abstract: Color is an important attribute that contributes to the appearance of a sweetpotato genotype. A consumer uses color, along with geometric attributes (e.g., gloss, luster, sheen, texture, opaqueness, shape), to subjectively evaluate the appearance of a sweetpotato root. Color can be quantified by the use of a color space (color order system), which is a three-dimensional specification system with a lightness (value) and two chromatic attributes, hue and saturation (chroma). In this study, color readings were taken from several sweetpotato entries from the Sweetpotato Collaborators Trials and other advanced lines grown in replicated plots at the U. S. Vegetable Laboratory, Charleston, SC, 2007-2009. Skin and flesh colors were measured with a Konica Minolta Chroma Meter (CR-400 with 8 mm aperture and 0° viewing angle) using the CIE 1976 L*a*b* and CIE L*C*h color spaces; and data were recorded using Color Data Software CM-S100w SpectraMagic NX™ (ver. 1.7) (Konica Minolta). Within the gamut of a color space, there is an elliptical subset of colors that represents the acceptable limits for a particular flesh or skin color for a type of sweetpotato. These acceptable color space gamuts are described for several important commercial sweetpotato cultivars. This paper also looks at the year-to-year variation in color of sweetpotato genotypes.