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.