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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.