Table 1. Summary of the mapping results.

Strain name	Linkage group	Physical position	Introgression size
ZZY0013	Chrom I	2.1 to 3.0 Mb	0.9 Mb
ZZY0021	Chrom II	6.1 to 11.1 Mb	4 Mb
ZZY0015	Chrom III	7.1 to 9.6 Mb	2.5 Mb
RW20120	Chrom X	1.5 to 6.0 Mb	4.5 Mb