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Table 1 Compositions of different DNA types in euchromatic and heterochromatic regions of plant genomes.

From: The many hues of plant heterochromatin

  Approximate proportions (%)
  Tandem   DNA Predicted Predicted  
Region repeats* Retroelements transposons genes pseudogenes [Ref]
Arabidopsis       
183 kb central 25 30 15 [0 to 4] [4]
hk4S knob       
Arabidopsis       
520 kb hk4S 10 30 10 [1 to 25] [4]
knob       
Arabidopsis 0 to 4 0 to 4 0 to 4 45 to 75 0 to 1 [5]
genic       
Arabidopsis       
'centromeric' 0 to >50 0 to 50 0 to 30 0 to 20 0 to 4 [5]
(II and IV)       
Arabidopsis       
pericentromeric 0 to 8 0 to 65 0 to 8 0 to 25 0 to 6 [5]
(II and IV)       
Rice genic       
(Adh 1/Adh 2) 0 14 14 26 4 [20]
Maize genic       
(adh 1) 0 77 5 10 to 12 2 [12]
Maize 9S knob 70 30 0 0 0 [9]
  1. *Does not include simple sequence repeats. Did not distinguish between predicted genes and predicted pseudogenes. Within functionally defined centromeric region, but not including central (most tandem repeat rich) region of the centromeres, which have not yet been sequenced.