IFEVA   02662
INSTITUTO DE INVESTIGACIONES FISIOLOGICAS Y ECOLOGICAS VINCULADAS A LA AGRICULTURA
Unidad Ejecutora - UE
artículos
Título:
Glyphosate resistance in Sorghum halepense and Lolium rigidum is reduced at suboptimal growing temperatures.
Autor/es:
VILA-AIUB, M.M.; GUNDEL, P.E.; YU, Q. & S.B. POWLES.
Revista:
PEST MANAGEMENT SCIENCE
Editorial:
JOHN WILEY & SONS LTD
Referencias:
Lugar: LOndres; Año: 2013 vol. 69 p. 228 - 232
ISSN:
1526-498X
Resumen:
BACKGROUND:
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 in
the majority of reported cases in L. rigidum the glyphosate resistance trait
has been associated with a mechanism that reduces glyphosate translocation
within plants. Here, the significant decrease in the glyphosate resistance level when resistant plants
of S. halepense and L. rigidum are grown at suboptimal cool temperature
conditions is reported.
RESULTS:
Lowering temperature from 30 to 19ºC in S. halepense and from 19 to 8º C in L.
rigidum significantly
reduced both plant survival and above-ground biomass produced by
glyphosate-resistant plants. Thus, 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.
CONCLUSION:
It is possible to increase the control of glyphosate-resistant S. halepense and
L. rigidum populations by treatment with glyphosate during growing conditions
at suboptimal low temperatures. Conversely, glyphosate failure will continue to
occur on glyphosate-resistant populations treated during periods of higher
temperatures.