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Table 1 General features of Scenedesmus and other UTC algal cpDNAs

From: The complete chloroplast genome sequence of the chlorophycean green alga Scenedesmus obliquus reveals a compact gene organization and a biased distribution of genes on the two DNA strands

Feature Chlorella Oltmannsiellopsis Pseudendoclonium Scenedesmus Chlamydomonas
Size (bp)      
   Total 150,613 151,933 195,867 161,452 203,827
   IR a 18,510 6,039 12,022 22,211
   LSC a 33,610 140,914 72,440 b 81,307 b
   SSC a 81,303 42,875 64,968 c 78,088 c
A+T (%) 68.4 59.5 68.5 73.1 65.5
Coding sequences (%) d 60.9 59.2 62.3 67.2 50.1
Genes (no.) e 112 105 105 96 94
Introns (no.)      
   Group I 3 5 27 7 5
   Group II 0 0 0 2 2
  1. aBecause Chlorella cpDNA lacks an IR, only the total size of this genome is given.
  2. bIn this study, this region is designated SC1 rather than LSC because it displays major differences in gene content relative to the LSC region in Mesostigma and Nephroselmis cpDNAs [13].
  3. c This region is designated SC2 rather than SSC because it displays major differences in gene content relative to the SSC region in Mesostigma and Nephroselmis cpDNAs [13].
  4. dConserved genes, unique ORFs and introns were considered as coding sequences.
  5. eGenes present in the IR were counted only once. Unique ORFs and intron ORFs were not taken into account.