A clade uniting the green algae Mesostigma viride and Chlorokybus atmophyticus represents the deepest branch of the Streptophyta in chloroplast genome-based phylogenies

Table 2 Abundance of repeats in Chlorokybus and other green algal cpDNAs

	Non-overlapping repeats ^a
cpDNA	Total size (bp)	Fraction of genome (%)	Fraction of intergenic regions (%) ^b
Streptophytes
Mesostigma	217	0.2	0.7
Chlorokybus	873	0.6	1.4
Chara	3,008	1.6	4.2
Chaetosphaeridium	972	0.7	3.2
Zygnema	2,226	1.3	3.2
Staurastrum	501	0.3	0.8
Chlorophytes
Nephroselmis	1,061	0.5	1.1
Chlorella	11,743	7.8	14.9
Oltmannsiellopsis	18,033	11.9	29.9
Pseudendoclonium	10,621	5.4	12.9
Stigeoclonium	39,941	17.8	38.2
Scenedesmus	4,817	3.0	8.3
Chlamydomonas	34,244	16.8	34.2

^a Non-overlapping repeat elements were mapped on each genome with RepeatMasker using the repeats ≥ 30 bp identified with REPuter [67] as input sequences.
^b Unique ORFs were considered to be non-coding sequences, i.e. components of intergenic regions.

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