Inheritance of Evolved Glyphosate Resistance in a North Carolina Palmer Amaranth (Amaranthus palmeri) Biotype
Table 2
Chi-square analysis of segregation for glyphosate resistance at 2000 g/ha in BC1F1 families assuming monogenic and two gene additive inheritance*.
Observed
One gene model
Two gene additive model
Backcross family
Expected
P value
Expected
P value
Alive
Dead
Total
Alive
Dead
Alive
Dead
BC1F1 S × R1
8
38
46
6.01
39.99
0.759
0.384
9.01
36.99
0.142
0.707
BC1F1 S × R2
7
45
52
6.79
45.21
0.007
0.932
10.19
41.81
1.241
0.265
BC1F1 S × R3
12
38
50
6.53
43.47
5.267
0.022
9.80
40.20
0.616
0.432
BC1F1 S × R4
20
32
52
6.79
45.21
29.539
<0.0001
10.19
41.81
11.750
0.001
BC1F1 S × R5
3
49
52
6.79
45.21
2.436
0.119
10.19
41.81
6.308
0.012
BC1F1 S × R6
3
37
40
5.22
34.77
1.090
0.296
7.84
32.16
3.713
0.054
BC1F1 S × R7
7
23
30
3.92
26.08
2.787
0.095
5.88
24.12
0.266
0.606
BC1F1 R × S1
19
33
52
6.79
45.21
25.235
<0.0001
10.19
41.81
9.477
0.002
BC1F1 R × S2
15
37
52
6.79
45.21
11.407
0.001
10.19
41.81
2.825
0.093
BC1F1 R × S3
4
48
52
6.79
45.21
1.321
0.250
10.19
41.81
4.675
0.031
BC1F1 R × S4
33
19
52
6.79
45.21
116.308
<0.0001
10.19
41.81
63.516
<0.0001
BC1F1 R × S5
6
46
52
6.79
45.21
0.106
0.744
10.19
41.81
2.142
0.143
BC1F1 R × S6
6
46
52
6.79
45.21
0.106
0.744
10.19
41.81
2.142
0.143
BC1F1 R × S7
7
45
52
6.79
45.21
0.007
0.932
10.19
41.81
1.241
0.265
BC1F1 R × S8
4
23
27
3.53
23.47
0.073
0.787
5.29
21.71
0.391
0.532
Total
196.449
<0.0001
110.446
<0.0001
Pooled
154
559
713
93.14
619.86
45.750
<0.0001
139.70
573.30
1.819
0.177
Homogeneity
150.699
<0.0001
108.627
<0.0001
Response of parental controls
GR Parent
39
13
52
GS Parent
0
52
52
F1 R × S
15
37
52
F1 S × R
11
36
47
*
Abbreviations used: GR: glyphosate-resistant; GS: glyphosate-susceptible; R × S and S × R: reciprocal crosses where, the first alphabet denotes female parent; BC1F1: backcross family; F1: first filial.
