Table 5 Parameters of the log–logistic model [Y=c+(d−c)/(1+(x/G)b)] used to calculate the GR50 of selected and unselected progeny and their R/S ratios from dose–response studies (Field)

From: Evolution of glyphosate resistance in a Lolium rigidum population by glyphosate selection at sublethal doses

Population

f a

d

c

G

b

RMS b

GR50 (g Ha−1)

R/S

VLR1

1

100

−12

71

2

113

133

—

1b

0

99

7

172

5

72

179

1.35

3b

12

100

−40

28

2

238

252

1.90

1c

4

100

−243

78

1

114

133

1.00

2c

4

100

−88

77

2

560

241

1.82

3c

0

98

12

154

3

155

214

1.62

1d

1

100

11

95

3

139

152

1.15

2d

9

100

−104

30

1

173

170

1.28

3d

1

100

14

126

4

287

193

1.45

  1. ANOVA analysis conducted for each non-linear regression is highly significant (P<0.001) and adjusted-R2>0.87.
  2. aWhere A stimulation of plant growth at low doses (hormesis) was observed this log–logistic model was used Y=c+[(d–c)+(f*x)]/[(1+(x/G)b)] In the equation, f is proportional to the hormetic behavior.
  3. bResidual mean square.
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