Resistance mechanisms to dinitroaniline herbicides in annual ryegrass (Lolium rigidum Gaudin)

Jinyi Chen

Research output: ThesisDoctoral Thesis

57 Downloads (Pure)

Abstract

Dinitroanilines (trifluralin, pendimethalin etc.) have been used as pre-emergence herbicides for ryegrass control for decades. With the dinitroaniline resistance evolution escalating, revealing dinitroaniline resistance mechanisms is of high importance. By investigating four trifluralin-resistant annual ryegrass populations, target-site a-tubulin mutations (including known Val-202-Phe, Thr-239-lle mutations and novel Arg-243-Lys/Met mutations), and non-target-site enhanced trifluralin metabolism were identified to confer dinitroaniline resistance. Additionally, the target-site resistance was mainly inherited as a nuclear-controlled recessive trait. And the Arg-243-Met mutation was found to incur profound changes in plant morphology. This knowledge is helpful for developing better weed management strategies to mitigate dinitroaniline resistance.
Original languageEnglish
QualificationDoctor of Philosophy
Awarding Institution
  • The University of Western Australia
Award date23 Jun 2019
DOIs
Publication statusUnpublished - 2019

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