Evolution of Target-Site Resistance to Glyphosate in an Population from Argentina and Its Expression at Different Plant Growth Temperatures.

The mechanism and expression of resistance to glyphosate at different plant growing temperatures was investigated in an population (VM1) from a soybean field in Vicuña Mackenna, Cordoba, Argentina. Resistance was not due to reduced glyphosate translocation to the meristem or to duplication, as reported for most US samples. In contrast, a proline 106 to serine target-site mutation acting additively with over-expression (1.