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Table 4 Tukey HSD results displaying significant differences between ploidy levels for important agronomic traits. Both F1 2× hybrids (EA) and (EB) and F1 3× hybrids (EAA) and (EBB) and their parent lines (EE), (AA), (BB), (AAAA) and (BBBB) were analyzed according to ploidy level (diploid, triploid, tetraploid)

From: Hybridity has a greater effect than paternal genome dosage on heterosis in sugar beet (Beta vulgaris)

Trait

(I) Ploidy

(J) Ploidy

Mean Difference (I-J)

Std. Error

Sig.

Total yield

Diploid

Triploid

−16.58

8.84

0.162

Tetraploid

84.24

8.84

<  0.001

Triploid

Tetraploid

100.81

10.57

<  0.001

Root yield

Diploid

Triploid

−10.70

5.77

0.169

Tetraploid

50.67

5.77

<  0.001

Triploid

Tetraploid

61.36

6.90

<  0.001

Sugar content

Diploid

Triploid

0.04

0.22

0.986

Tetraploid

1.14

0.22

<  0.001

Triploid

Tetraploid

1.11

0.26

<  0.001

Sugar yield

Diploid

Triploid

−1.59

0.91

0.202

Tetraploid

8.66

0.91

<  0.001

Triploid

Tetraploid

10.25

1.09

<  0.001

Seed viability

Diploid

Triploid

8.56

3.01

0.021

Tetraploid

64.31

3.01

<  0.001

Triploid

Tetraploid

55.75

3.60

<  0.001