Table 1.

The basic characteristics of the cp genomes of four Ulmus species and H. davidii.

	Hemiptelea davidii	Ulmus parvifolia	Ulmus lamellosa	Ulmus pumila ‘zhonghuajinye’	Ulmus castaneifolia
Total length (bp)	159,803	159,199	160,388	159,113	159,925
Total gene number	130	131	131	131	131
Total GC(%)	35.30	35.60	35.43	35.62	35.49
LSC length (bp)	87,798	87,736	88,466	87,994	88,154
GC (%)	32.74	33.08	32.90	33.08	32.96
SSC length (bp)	18,761	18,743	19,024	18,485	18,955
GC (%)	28.08	28.60	28.15	28.63	28.34
IR length (bp)	26,622	26,360	26,449	26,317	26,408
GC (%)	42.07	42.30	42.25	42.34	42.28
Coding region length	80,517	80,472	80,532	80,559	80,487
Coding region GC (%)	36.62	36.73	36.74	36.73	36.72
Noncoding region length (bp)	79,286	78,727	79,856	78,554	79,438
Noncoding region GC (%)	33.96	34.44	34.11	34.48	34.24
Protein-coding gene number	85	86	86	86	86
tRNA	37	37	37	37	37
tRNA GC (%)	53.12	53.12	53.12	53.12	53.12
rRNA	8	8	8	8	8
rRNA GC (%)	55.29	55.33	55.33	55.33	55.33