This podcast with AHRI Principal Research Fellow Dr Qin Yu focuses on explaining some of the more tricky aspects of the paper:A double EPSPS gene mutation endowing glyphosate resistance shows a remarkably high resistance costThis paper was a collaboration between AHRI researchers Heping Han, Qin Yu, and Steve Powles, as well as past AHRI researchers Adam Jalaludin and Martin Vila-Aiub.AHRI researcher Heping Han and others with GRDC support recently found a large fitness penalty in glyphosate-resistant crowsfoot grass. We have previously reported on this glyphosate resistance here. At the time we could see by looking at the pictures of the plants that the ones with the homozygous TIPS mutation were severely stunted. The researchers have now further investigated this and found that the homozygous TIPS plants have 50% reduction in seed set and this escalates to 85% in plants that are in competition with a rice crop.The TIPS mutation that causes high-level glyphosate resistance affects plant fitness. The TIPS mutation is a double mutation of the glyphosate target site, the 102 and the 106 mutation. The 106 mutation has been found in a number of species and has no fitness penalty associated with it, but the 102 + 106 mutation comes with a big fitness penalty.Most of the known glyphosate resistance mechanisms cause fairly low level, 4 to 8-fold, resistance. The TIPS mutation causes huge, 140 to 180-fold resistance with some plants surviving more than 57 L/ha glyphosate. The last AHRI insight of 2017 focuses on explaining this paper. You can read it here. By listening to this podcast first, you'll have a good understanding of the background information and better understand the commentary in AHRI insight and the paper.Music: bensound.com
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