Fig. 1

Comparative analysis of essential oils in the fruit peel of C. reticulata ‘Chachi’ in different planting areas. a Principal component analysis of Euclidean distance for essential oil contents in core and non-core region samples. b Boxplot showing the contents of essential oils between core and non-core regions. n = 56 biologically independent samples. Significance is indicated between core and non-core regions by the Wilcoxon rank sum test with an adjusted P value. c The importance rank of variables selected by the random forest model. Seven monoterpenes (green box) with high importance ranks were used to predict the source of C. reticulata ‘Chachi’