Table 2

Proportion and base composition of coding sequences, intergenic spacers and introns in Staurastrum, Zygnema, Chaetosphaeridium and Marchantia cpDNAs

Sequences

Staurastrum

Zygnema

Chaetosphaeridium

Marchantia


Coding sequencesa

Fraction of genome (%)

51.4

50.8

67.5

69.9

A+T content (%)

65.1

63.0

66.1

67.7

Intergenic spacers

Fraction of genome (%)

42.0

42.2

23.1

19.3

A+T content (%)

70.0

75.7

79.8

80.6

Average size (bp)

536

546

223

178

Introns

Fraction of genome (%)

6.6

7.0

9.4

10.7

A+T content (%)

70.8

71.1

77.6

76.8

Average size (bp)

1,298

892

686

650


a Unique ORFs and intron ORFs were not considered to be coding sequences.

Turmel et al. BMC Biology 2005 3:22   doi:10.1186/1741-7007-3-22

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