Journal
PLANTS-BASEL
Volume 8, Issue 11, Pages -Publisher
MDPI
DOI: 10.3390/plants8110512
Keywords
Amaranthus palmeri; Argentina; glyphosate; resistance mechanism; P106S EPSPS mutation; EPSPS over-expression
Categories
Ask authors/readers for more resources
The mechanism and expression of resistance to glyphosate at different plant growing temperatures was investigated in an Amaranthus palmeri population (VM1) from a soybean field in Vicuna Mackenna, Cordoba, Argentina. Resistance was not due to reduced glyphosate translocation to the meristem or to EPSPS duplication, as reported for most US samples. In contrast, a proline 106 to serine target-site mutation acting additively with EPSPS over-expression (1.8-fold increase) was respectively a major and minor contributor to glyphosate resistance in VM1. Resistance indices based on LD50 values generated using progenies from a cross between 52 PS106 VM1 individuals were estimated at 7.1 for homozygous SS106 and 4.3 for heterozygous PS106 compared with homozygous wild PP106 plants grown at a medium temperature of 24 degrees C day/18 degrees C night. A larger proportion of wild and mutant progenies survived a single commonly employed glyphosate rate when maintained at 30 degrees C day/26 degrees C night compared with 20 degrees C day/16 night in a subsequent experiment. Interestingly, the P106S mutation was not identified in any of the 920 plants analysed from 115 US populations, thereby potentially reflecting the difference in A. palmeri control practices in Argentina and USA.
Authors
I am an author on this paper
Click your name to claim this paper and add it to your profile.
Reviews
Recommended
No Data Available