2.1 Chinese walnut sample collection and genomic DNA extraction
We collected leaf samples from a single individual of Chinese walnut
(J. cathayensis ) growing in the Qingling Mountains, Xi’an,
Shaanxi, China (altitude: 1489 m, 33°46’58”E, 108°34’06”N). Genomic
DNA was obtained using a plant DNA extraction Kit (TIANGEN, Beijing,
China). A total of 18 tissues were collected from the same tree
described above for RNA sequencing (Figure 1a, b; Table S1).