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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.