Fig. 3

PCA of the aroma volatiles identified at different mature period of melon. The four stages of melon included “d5” (5DAA), “d15” (15DAA), “d25” (25DAA) and “d35” (35DAA). a Scores plots of the two main PCA of the aroma volatiles identified at the different mature period of melon. b Loading plots of the two main PCA of the aroma volatiles identified at the different mature period of melon. Codes were corresponding to the volatile compounds number in Additional file 2