Table 5.
Parameter estimates of the equation used to calculate the sensitivity of EPSPS enzyme activity to glyphosate in extracts from leaf tissue of the different accessions of P. hyterophorus from Cuba and Dominican Republic.
| Accessions | d | b | R2 | I50 (μM)a | RI | P |
|---|---|---|---|---|---|---|
| Cu-R1 | 100.1 | 0.9 | 0.97 | 646.2 ± 35.8 | 47.6 | <0.0001 |
| Cu-R2 | 99.8 | 0.8 | 0.96 | 18.9 ± 1.4 | 1.4 | 0.1902 |
| Cu-R3 | 97.0 | 1.0 | 0.99 | 17.4 ± 2.8 | 1.2 | 0.2186 |
| Cu-S | 96.2 | 1.2 | 0.98 | 13.6 ± 2.2 | – | – |
| Do-R1 | 100.0 | 0.8 | 0.99 | 468.1 ± 22.0 | 25.2 | <0.0001 |
| Do-R2 | 100.4 | 0.7 | 0.99 | 410.7 ± 26.1 | 22.1 | <0.0001 |
| Do-R3 | 94.5 | 1.2 | 0.98 | 22.6 ± 1.5 | 1.2 | 0.3714 |
| Do-R4 | 94.0 | 1.2 | 0.96 | 20.8 ± 6.1 | 1.1 | 0.6042 |
| Do-S | 93.6 | 1.2 | 0.99 | 18.5 ± 5.7 | – | – |
a
For Y = {(d) / [1 + (x/ I50) exp b]} Where Y is the EPSPS activity, d is the coefficient corresponding to the upper asymptote, b is the slope of the curve in I50, I50 is the herbicide rate at the point of inflection halfway, and x is the herbicide dose.