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Table 1 General features of cpDNAs from Staurastrum, Zygnema, other streptophytes and Mesostigma

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

Feature Mesostigma Staurastrum Zygnema Chaetosphaeridium Marchantia
Sizea (bp)      
   IR 6,057 - - 12,431 10,058
   SSC 22,619 - - 17,639 19,813
   LSC 83,627 - - 88,682 81,095
   Genome 118,360 157,089 165,372 131,183 121,024
A+T content (%) 69.9 67.5 68.9 70.4 71.2
Gene contentb 136 121 125 125 120
Introns      
   Group I 0 1 1 1 1
   Group II      
Cis-spliced 0 6 11 16 18
Trans-spliced 0 1 1 1 1
  1. a Because Staurastrum and Zygnema cpDNAs lack an IR, only the genome size is given for each of these cpDNAs. SSC, small single-copy region; LSC, large single-copy region.
  2. b Unique ORFs, intron ORFs and pseudogenes were not taken into account. Note that Chaetosphaeridium tufA was considered to be a functional gene.