Fig 2. Principal component analysis (PCA) of the aroma volatiles identified in four types of melon at the commercial mature period.

The four types of melon included “Yu Meiren” (YMR), “Cui Bao” (CB), “Shao Gua” (SHAO) and “Cai Gua” (CAI). (A)Scores plots of the two main principal component analysis (PCA) of the aroma volatiles identified in four types of melon at the commercial mature period. (B) Loading plots of the two main principal component analysis (PCA) of the aroma volatiles identified in four types of melon at the commercial mature period. Each sample consisted of three replicates. Codes were corresponding to the volatile compounds number in S1 Table.