Estimating Heritability of Skinning Resistance in Sweetpotato

Sweetpotato (Ipomoea batatas) is experiencing burgeoning demand; however, high production costs continue to limit farmer income. More mechanized approaches to harvest are needed to save on labor expenses. Many of the popular varieties of sweetpotatoes are highly susceptible to skinning damage and the problems that are associated with such damage such as rotting and weight loss. A more durable skin would greatly facilitate transition to more mechanization; however, it is unknown if we can breed for a more durable skin. The objective of the present study is to develop a suitable assessment tool for skinning resistance and determine heritability. A modified torque wrench device used in potato was found superior to other techniques in measuring skinning resistance. Heritability is being estimated over two growing seasons and initial findings will be presented. Estimates of heritability rs. The torque wrench will be used in a 2-year study of multiple varieties of undamaged sweet potato roots in order to analyze the amount of skinning resistance. Heritability tests will compare the data collected in subsequent generations in order to determine if skinning resistance is a heritable trait that can be easily bred for.