Citrus genotypes used in this study.

aCollected from National Citrus Breeding Centre of China (NCBC).
bCollected from Citrus Research Institute of Chinese Academy of Agricultural Sciences (CRIC).
cCollected from Citrus Experimental Station (CES), Zigui county, Hubei Province, China.
*The samples in bold were collected only for peel oils analysis, while the samples in italic were collected only for leaf volatile analysis, and the samples in normal font were for both analyses. The abbreviations of fruit samples belonging to Sinocitrus were marked with underline.