Fig. 1

Distribution of F1 offspring from the RGTxGD cross based on the percentage of fruit russeting. The fruit russeting was measured in 2013 by means of digital image analysis. Plants were ordered on the basis of the average fruit russeting coverage. Dotted horizontal line indicates russeting percentage distinguishing between clean and russet genotypes as indicated by [30]. The average russeting coverage of the fruits of the two parental lines are reported beside the y axis. Number of observed individuals (n) and Shapiro-Wilks test significance for normality distribution are indicated on the top