TABLE 1.

A quality comparison of three D. officinale genome versions.

Items	v.1.0 (Yan et al., 2015)	v.2.0 (Zhang G. Q. et al., 2016)	v.3.0 (Niu et al., 2021)
Sequencing platform	Illumina HiSeq 2000 PacBio RS II	Illumina HiSeq 2000	Illumina HiSeq 2500 PacBio Sequel II
Genome size	1.36 Gb	1.01 Gb	1.23 Gb
Heterozygosity	0.48%	0.628%	1.27%
Contig N50	25.12 kb	33.09 kb	1.44 Mb
Contig number	814,881	105,732	2,430
Scaffold N50	76.49 kb	391.46 kb	63.07 Mb
Assembly level	Scaffold	Scaffold	Chromosome
WGD	–	2	2
Repetitive ratio	63.33%	78.1%	64.39%
SNPs	5,432,657	5,758,781	–
Protein-coding genes	35,567	28,910	27,631
Specific gene families	1,462	629	1,196
Functionally annotated genes	34,699	–	25,894