The complete chloroplast genome sequence of the chlorophycean green alga Scenedesmus obliquus reveals a compact gene organization and a biased distribution of genes on the two DNA strands

Table 1 General features of Scenedesmus and other UTC algal cpDNAs

Feature	Chlorella	Oltmannsiellopsis	Pseudendoclonium	Scenedesmus	Chlamydomonas
Size (bp)
Total	150,613	151,933	195,867	161,452	203,827
IR	– ^a	18,510	6,039	12,022	22,211
LSC	– ^a	33,610	140,914	72,440 ^b	81,307 ^b
SSC	– ^a	81,303	42,875	64,968 ^c	78,088 ^c
A+T (%)	68.4	59.5	68.5	73.1	65.5
Coding sequences (%) ^d	60.9	59.2	62.3	67.2	50.1
Genes (no.) ^e	112	105	105	96	94
Introns (no.)
Group I	3	5	27	7	5
Group II	0	0	0	2	2

^aBecause Chlorella cpDNA lacks an IR, only the total size of this genome is given.
^bIn this study, this region is designated SC1 rather than LSC because it displays major differences in gene content relative to the LSC region in Mesostigma and Nephroselmis cpDNAs [13].
^c This region is designated SC2 rather than SSC because it displays major differences in gene content relative to the SSC region in Mesostigma and Nephroselmis cpDNAs [13].
^dConserved genes, unique ORFs and introns were considered as coding sequences.
^eGenes present in the IR were counted only once. Unique ORFs and intron ORFs were not taken into account.

ISSN: 2730-7182