An examination of fitness costs of glyphosate resistance in the common morning glory, Ipomoea purpurea

Ecology and Evolution
Catherine L DebbanRegina S Baucom

Abstract

Fitness costs are frequently invoked to explain the presence of genetic variation underlying plant defense across many types of damaging agents. Despite the expectation that costs of resistance are prevalent, however, they have been difficult to detect in nature. To examine the potential that resistance confers a fitness cost, we examined the survival and fitness of genetic lines of the common morning glory, Ipomoea purpurea, that diverged in the level of resistance to the herbicide glyphosate. We planted a large field experiment and assessed survival following herbicide application as well as fitness of the divergent selection lines in the absence of the herbicide. We found that genetic lines selected for increased resistance exhibited lower death compared to control and susceptible lines in the presence of the herbicide, but no evidence that resistant lines produced fewer seeds in the absence of herbicide. However, susceptible lines produced more viable seeds than resistant or control lines, providing some evidence of a fitness cost in terms of seed germination, and thus potential empirical support for the expectation of trait trade-offs as a consequence of adaptation to novel environments.

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Citations

Jul 30, 2016·Evolution; International Journal of Organic Evolution·Megan L Van EttenRegina S Baucom
Dec 6, 2017·Pest Management Science·Roger D Cousens, Alexandre Fournier-Level
Feb 13, 2016·G3 : Genes - Genomes - Genetics·Josep M CasacubertaJonathan Wendel
Mar 23, 2017·Environmental Science and Pollution Research International·Nathalie ColbachHenri Darmency
Jul 18, 2017·Frontiers in Plant Science·Omobolanle Adewale Osipitan, Johanna Anita Dille

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Methods Mentioned

BETA
transgenic
germination

Software Mentioned

adjust
lme4
R Core Team
R
R package pedigreemm

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