Table 1 Segregation distortion loci present in the reciprocal F2 maize population

From: The maternal cytoplasmic environment may be involved in the viability selection of gametes and zygotes

SDL name

Chromosome

Position (cM)

Adjacent marker

Distant to adjacent marker (cM)

Cytoplasm background

LOD

JB homozygotes/heterozygotes/Y53 homozygotes (%)

χ2-value

sJB

sY53

h

Selection type

SDL1

1

41.74

umc1160

2.88

JB

21.23

14.83/16.06/69.10

53.82**

0.79

0.00

1.13

I

     

Y53

0.08

23.31/53.28/23.41

 

0.00

0.00

−32.30

—

SDL2.1

2

22.40

bnlg1338

0.00

JB

1.05

30.00/40.00/30.00

38.74**

0.00

0.00

∞

—

     

Y53

24.73

21.00/10.93/68.08

 

0.69

0.00

1.33

I

SDL2.2

2

69.11

umc1961

0.00

JB

38.84

25.46/0.87/73.68

133.44**

0.65

0.00

1.52

III

     

Y53

3.71

23.98/65.93/10.09

 

0.00

0.58

−0.65

VI

SDL2.3

2

152.49

umc1536

−2.94

JB

0.30

24.63/54.58/20.79

7.96*

0.00

0.16

−0.69

—

     

Y53

4.11

38.07/52.16/9.77

 

0.00

0.74

0.42

IV

SDL3.1

3

45.98

umc1772

2.88

JB

11.21

1.32/52.10/46.58

30.10**

0.97

0.00

0.45

II

     

Y53

1.07

19.00/60.13/20.87

 

0.09

0.00

−4.92

—

SDL3.2

3

114.13

bnlg420

0.00

JB

5.29

17.46/36.70/45.83

2.87

0.62

0.00

0.97

I

     

Y53

2.41

24.22/37.48/38.30

 

0.37

0.00

1.39

—

SDL3.3

3

176.37

bnlg1449

0.00

JB

44.02

19.17/0.83/80.00

P>0.05

0.76

0.00

1.31

III

  

175.38

bnlg1449

−1.00

Y53

53.60

9.16/0.00/90.84

 

0.90

0.00

1.11

III

SDL4

4

4.80

bnlg1937

−1.00

JB

24.54

5.61/22.52/71.87

42.33**

0.92

0.00

0.91

I

     

Y53

0.44

20.27/50.13/29.60

 

0.32

0.00

0.49

—

SDL5.1

5

84.31

umc1056

0.00

JB

0.18

22.88/54.22/22.90

7.38*

0.00

0.00

−210.5

—

     

Y53

3.76

11.59/66.73/21.68

 

0.47

0.00

−1.16

VI

SDL5.2

5

134.52

umc1019

0.00

JB

1.41

15.34/56.15/28.52

21.42**

0.46

0.00

0.03

—

     

Y53

3.61

38.39/31.44/30.17

 

0.00

0.21

2.76

V

SDL5.3

5

188.19

umc2143

0.00

JB

19.02

7.57/25.91/66.52

48.42**

0.89

0.00

0.91

I

     

Y53

0.04

26.56/49.38/24.06

 

0.00

0.09

0.75

—

SDL6

6

123.11

umc2123

−5.86

JB

15.04

12.27/20.67/67.06

40.24**

0.82

0.00

1.04

I

     

Y53

0.16

28.67/45.54/25.80

 

0.00

0.10

2.06

—

SDL7

7

30.37

dupssr11

0.00

JB

41.19

23.33/0.83/75.83

40.91**

0.69

0.00

1.44

III

     

Y53

5.69

31.83/26.04/42.13

 

0.24

0.00

2.83

V

SDL8

8

39.53

bnlg240

0.00

JB

9.17

10.83/37.52/51.64

30.78**

0.79

0.00

0.81

I

     

Y53

0.85

32.83/46.64/20.53

 

0.00

0.37

0.77

—

  1. Note: Cytoplasmic background denoted for two F2 populations from the JB (female parent) × Y53 (male parent) direct cross and the Y53 (female parent) × JB (male parent) reciprocal cross with the JB and Y53 cytoplasmic backgrounds, respectively. SDL analysis was performed in the two crosses separately, and SDL were finally identified in the crosses with the significant LOD value (>3.0) noted in bold. The positive and negative values of the distant to adjacent marker represent the relative downstream and upstream position of SDL to the adjacent markers, respectively. The genotype frequencies at the distortion loci in the two crosses are listed in this table. A χ2-test was performed to analyse the difference of genotypic proportion in the two cytoplasmic backgrounds in the level of segregation distortion. Fisher’s exact test was performed for SDL3.3 because the data did not meet the general requirement of a χ2-test. * and ** denote significance at 0.05 and 0.01 level, respectively. sJB and sY53 denote the selection coefficients for JB and Y53 homozygotes, respectively. h denotes the degree of dominance.
  2. Selection type I: strong elimination of gametes and zygotes with JB alleles.
  3. Selection type II: extreme elimination of gametes with the JB allele from one parent.
  4. Selection type III: extreme elimination of heterozygotes and mild elimination of homozygotes with JB alleles.
  5. Selection type IV: strong elimination of gametes and zygotes with Y53 alleles.
  6. Selection type V: mild elimination of heterozygotes.
  7. Selection type VI: mild elimination of homozygotes.
  8. The short dash denotes no selection.
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