4.5 Conclusion
In summary, an improved chromosome-level genome of F. chinensiswas reported in this article. The assembled genome was 1.47 Gb in size, and was anchored to 43 pseudochromosomes, with N50 length of 36.87 Mb. The contraction of the genome size was speculated relating to the migration. Gene families related to cellular processes and metabolic processes expanded, while gene families associated with virus infection contracted to adapt to the cold environment. Furthermore, genetic variations in genes associated with metabolism, phototransduction, and nervous system were detected by selection signature, indicating targeted artificial selection on growth, vision, and behavior during domestication.