Table 4 The lengths of the primary, secondary, and tertiary SBs in the comparison of 16 Juglans regia (Jr) chromosomes (total physical map length = 736070 Mb) with the pseudomolecules of Vitis vinifera (Vv), Populus trichocarpa (Pt), Malus domestica (Md), Medicago truncatula (Mt), Cucumis sativus (Cs), and Fragaria vesca (Fv)

Chromosome number

19

19

17

8

7

7

Total length of the primary SBs (Mb)

600.144a^a

556.891a

535.223a

349.414c

459.251b

298.298c

Percent of the Jr physical map

82

76

73

49

62

41

Total length of the secondary SBs (Mb)

106.351b^a

379.983a

267.060a

133.824b

178.461b

2.871d

Percent of the Jr physical map

14

52

36

19

22

1

Length of the tertiary SBs (Mb)

6.920^b

62.581

6.692

4.715

14.436

0

Percent of the Jr physical map

1

9

1

1

2

0

Ratio of secondary SBs to primary SBs

0.17

0.68

0.50

0.39

0.39

0.01