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Table 2 Proportion and base composition of coding sequences, intergenic spacers and introns in Staurastrum, Zygnema, Chaetosphaeridium and Marchantia cpDNAs

From: The complete chloroplast DNA sequences of the charophycean green algae Staurastrum and Zygnema reveal that the chloroplast genome underwent extensive changes during the evolution of the Zygnematales

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

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