Inheritance of Evolved Glyphosate Resistance in a North Carolina Palmer Amaranth (Amaranthus palmeri) Biotype
Table 3
Chi-square analysis of segregation for glyphosate resistance at 3000 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
1
38
39
3.12
35.88
1.566
0.211
4.68
34.32
3.288
0.070
BC1F1 S × R2
2
50
52
4.16
47.84
1.219
0.270
6.24
45.76
3.274
0.070
BC1F1 S × R3
3
47
50
4
46
0.272
0.602
6
44
1.705
0.192
BC1F1 S × R4
4
48
52
4.16
47.84
0.007
0.935
6.24
45.76
0.914
0.339
BC1F1 S × R5
0
52
52
4.16
47.84
4.522
0.033
6.24
45.76
7.091
0.008
BC1F1 S × R6
2
41
43
3.44
39.56
0.655
0.418
5.16
37.84
2.199
0.138
BC1F1 S × R7
1
32
33
2.64
30.36
1.107
0.293
3.96
29.04
2.514
0.113
BC1F1 R × S1
21
31
52
4.16
47.84
74.097
<0.0001
6.24
45.76
39.674
<0.0001
BC1F1 R × S2
11
41
52
4.16
47.84
12.224
<0.0001
6.24
45.76
4.126
0.042
BC1F1 R × S3
2
50
52
4.16
47.84
1.219
0.270
6.24
45.76
3.274
0.070
BC1F1 R × S4
24
28
52
4.16
47.84
102.849
<0.0001
6.24
45.76
57.441
<0.0001
BC1F1 R × S5
8
44
52
4.16
47.84
3.853
0.050
6.24
45.76
0.564
0.453
BC1F1 R × S6
9
43
52
4.16
47.84
6.121
0.013
6.24
45.76
1.387
0.239
BC1F1 R × S7
14
36
50
4
46
27.174
<0.0001
6
44
12.121
<0.0001
BC1F1 R × S8
1
24
25
2
23
0.543
0.461
3
22
1.515
0.218
Total
237.429
<0.0001
141.087
<0.0001
Pooled
103
605
708
56.64
651.36
41.245
<0.0001
84.96
623.04
4.353
0.037
Homogeneity
196.184
<0.0001
136.734
<0.0001
Response of parental controls
GR Parent
35
17
52
GS Parent
0
52
52
F1 R × S
6
44
50
F1 S × R
10
40
50
*
Abbreviations used: R: glyphosate-resistant; S: glyphosate-susceptible; R × S and S × R: reciprocal crosses where, the first alphabet denotes female parent; BC1F1: backcross family; F1: first filial.
