Table 3 Parameters of the log-logistic equationa used to calculate the glyphosate concentration dose (µM) required to reduce the EPSPS activity reduction (I50) by 50% of the glyphosate-resistant and -susceptible goosegrass (Eleusine indica) biotypes collected in citrus groves from Veracruz, Mexico.

From: Pro-106-Ser mutation and EPSPS overexpression acting together simultaneously in glyphosate-resistant goosegrass (Eleusine indica)

Biotypes c d b I50 CI95%b RIc P
Ein-Pl1 3.91 100.00 3.82 161.1 18.8 13.8 <0.0001
Ein-Pl2 5.90 99.42 3.37 125.9 14.6 10.8 <0.0001
Ein-Or 2.14 98.93 1.48 14.4 2.8 1.2 <0.0001
Ein-S 1.07 99.37 1.53 11.7 3.3 <0.0001
  1. a Y = c + {(d − c)/[1 + (x/g)b]} where; Y is the percentage of EPSPS activity with respect to the control, c and d are the lower and upper asymptotes, b is the slope of the curve at the inflection point, I50 the herbicide dose at the inflection point, and x (independent variable) is the glyphosate concentration. bCI values are the upper and lower limits (±) of the 95% confidence intervals (n = 3). cRI = Resistance index = I50R/I50S.