IFEVA   02662
INSTITUTO DE INVESTIGACIONES FISIOLOGICAS Y ECOLOGICAS VINCULADAS A LA AGRICULTURA
Unidad Ejecutora - UE
congresos y reuniones científicas
Título:
Glyphosate resistance in Sorghum halepense and Lolium rigidum is reduced at suboptimal growing temperatures
Autor/es:
VILA AIUB, MM; GUNDEL, P.E.; YU, Q; POWLES, SB
Reunión:
Conferencia; Global Herbicide Resistance Challenge Conference; 2013
Resumen:
Glyphosate resistance in populations of the C4 perennial Sorghum halepense (Johnsongrass) and C3 annual Lolium rigidum (rigid ryegrass) has evolved and been documented in many cropping areas around the globe. In S. halepense and majority of the reported cases in L. rigidum the glyphosate resistance trait has been associated with a mechanism that reduces glyphosate translocation within plants. Here we report on the significant decrease in the glyphosate resistance level when resistant plants of both S. halepense and L. rigidum are grown at suboptimal cool temperature conditions. Lowering temperature from 30°C to 19°C in S. halepense and from 19°C to 8°C in L. rigidum significantly reduced both plant survival and aboveground biomass produced by glyphosate resistant plants. Consequently, glyphosate resistance parameters significantly decreased when glyphosate treated resistant plants of both species were grown under non optimal temperature conditions. The results suggest that the resistance mechanism against glyphosate damage is less efficient at optimal growing temperatures. It is possible to increase control of glyphosate resistant S. halepense and L. rigidum populations when glyphosate treated during growing conditions with suboptimal low temperatures. Conversely, glyphosate failure will continue to occur on glyphosate resistant populations treated during months of higher temperatures.