Paraquat resistance in a population of Lolium rigidum

Functional Plant Biology : FPB
Qin YuStephen B Powles

Abstract

The first case of field-evolved paraquat resistance in a population of Lolium rigidum Gaud. (from the Western Cape, South Africa) was confirmed and the mechanism of resistance investigated. The LD50 for the resistant population (R) was 404 g ha-1, some 14 times greater than for the herbicide-susceptible (S) population (30 g ha-1). In addition, the R population was found to be more resistant to paraquat when kept at low temperature (15°C) than when kept at 30°C after paraquat treatment. The R population is normally affected by herbicides with other modes of action. No differences were found in the interaction of paraquat with Photosystem I in thylakoids isolated from the R and the S populations. Constitutive levels of the antioxidative enzymes superoxide dismutase (SOD) and ascorbate peroxidase (APX) did not differ significantly between the two populations and these enzymes responded similarly to paraquat treatment. When [14C] paraquat was applied as droplets to intact plant leaves, similar leaf uptake of [14C] paraquat occurred in the R and S populations. However, quantification data and phosphor imaging revealed restricted translocation of [14C] paraquat to untreated leaves in the R compared to S population. The results of thi...Continue Reading

Citations

Dec 15, 2007·Pest Management Science·Christopher Preston, Angela M Wakelin
Mar 25, 2009·TAG. Theoretical and applied genetics. Theoretische und angewandte Genetik·Qin YuStephen B Powles
May 21, 2020·The Journal of Biological Chemistry·Todd A GainesFranck E Dayan
Mar 3, 2010·Annual Review of Plant Biology·Stephen B Powles, Qin Yu
Feb 9, 2021·Frontiers in Plant Science·Andréia K SuzukawaCaio A C G Brunharo
Jul 15, 2021·Pest Management Science·Roberto BusiAndrea Onofri

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