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Glyphosate Resistance in Perennial Ryegrass (Lolium perenne L.) is Associated with a Fitness Penalty

Published online by Cambridge University Press:  20 January 2017

Marcos Yanniccari*
Affiliation:
Plant Physiology Institute (Consejo Nacional de Investigaciones Científicas y Técnicas, Universidad Nacional de La Plata), La Plata (1900), Argentina
Martín Vila-Aiub
Affiliation:
Agricultural Plant Physiology and Ecology Research Institute (Consejo Nacional de Investigaciones Científicas y Técnicas, Universidad de Buenos Aires), Buenos Aires (1417), Argentina, and School of Plant Biology, Institute of Agriculture, University of Western Australia
Carolina Istilart
Affiliation:
Chacra Experimental Integrada Barrow (MAA-INTA), Tres Arroyos (7500), Argentina
Horacio Acciaresi
Affiliation:
Comisión de Investigaciones Científicas Provincia de Buenos Aires & INTA, Pergamino (2700), Argentina
Ana M. Castro
Affiliation:
Plant Physiology Institute (Consejo Nacional de Investigaciones Científicas y Técnicas, Universidad Nacional de La Plata), La Plata (1900), Argentina
*
Corresponding author's E-mail: marcosyanniccari@conicet.gov.ar
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Abstract

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The net selection effect of herbicides on herbicide-resistance traits in weeds is conditioned by the fitness benefits and costs associated with resistance alleles. Fitness costs play an important evolutionary role preventing the fixation of adaptive alleles and contributing to the maintenance of genetic polymorphisms within populations. Glyphosate is widely used in world agriculture, which has led to the evolution of widespread glyphosate resistance in many weed species. The fitness of glyphosate-resistant and -susceptible perennial ryegrass plants selected from within a single population were studied in two field experiments conducted during 2011 and 2012 under different soil water availability. Glyphosate-resistant plants showed a reduction in height of 12 and 16%, leaf blade area of 16 and 33%, shoot biomass of 45 and 55%, seed number of 33 and 53%, and total seed mass of 16 and 5% compared to glyphosate-susceptible plants in 2011 and 2012, respectively. The reduction in seed number per plant resulted in a 40% fitness cost associated with the glyphosate-resistance trait in perennial ryegrass. Fitness costs of glyphosate-resistant plants were expressed under both conditions of water availability. These results could be useful for designing management strategies and exploiting the reduced glyphosate-resistant perennial ryegrass fitness in the absence of glyphosate selection.

Type
Weed Biology and Ecology
Copyright
Copyright © Weed Science Society of America 

Footnotes

Associate Editor for this paper: Chris Preston, University of Adelaide.

References

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