Differential Resistance Mechanisms to Glyphosate Result in Fitness Cost for Lolium perenne and L. multiflorum

Frontiers in Plant Science
Pablo T Fernández-MorenoRafael De Prado

Abstract

Multiple mechanisms of resistance to glyphosate are exhibited by populations of Lolium spp. worldwide. Association of resistance with growth and reproductive fitness is an important predictor for long-term success of glyphosate-resistant (R) versus glyphosate-susceptible (S) biotypes. Numerous studies were conducted on R- and S-biotypes of Italian ryegrass (Lolium multiflorum) and perennial ryegrass (L. perenne) to characterize the underlying mechanism(s) of glyphosate resistance and associate this with growth and reproductive fitness. L. perenne expressed both altered uptake and translocation as well as a genetic change at 106-Pro to -Ser, This pattern for two resistance mechanisms is unique. L. multiflorum also exhibited altered uptake and translocation as well as duplication of EPSPS gene copies. Reduced plant biomass and height for R-versus S-biotypes of both species was evident over two growing seasons. This resulted in S- versus R- L. multiflorum producing up to 47 and 38% more seeds in 2014 and 2015, respectively. S- L. perenne produced up to 20 and 30% more seeds in 2014 and 2015, respectively. Both non-target site and target-site mechanisms of glyphosate resistance can render Lolium spp. at a competitive disadvantage. ...Continue Reading

References

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Dec 6, 2016·Frontiers in Plant Science·Ricardo Alcántara-de la CruzRafael De Prado
Jun 24, 2017·Pest Management Science·Stephen O Duke

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Citations

Dec 1, 2017·Frontiers in Plant Science·Enzo R BracamonteRafael De Prado
Feb 10, 2019·The New Phytologist·Martin M Vila-AiubStephen B Powles
Apr 15, 2020·Pesticide Biochemistry and Physiology·E AnthimidouI Eleftherohorinos
Feb 9, 2021·Frontiers in Plant Science·Andréia K SuzukawaCaio A C G Brunharo
Mar 9, 2021·Frontiers in Plant Science·José G Vázquez-GarcíaRafael De Prado

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Methods Mentioned

BETA
electrophoresis
scintillation
Assay
PCR

Software Mentioned

drc
SAGAMX
SigmaPlot
R
NTSYSpc
geNorm

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