Non-target-Site Resistance in Lolium spp. Globally: A Review

Abstract

TheLoliumgenus encompasses many species that colonize a variety of disturbed and non-disturbed environments.Lolium perenneL. spp.perenne,L.perenneL. spp.multiflorum, andL.rigidumare of particular interest to weed scientists because of their ability to thrive in agricultural and non-agricultural areas. Herbicides are the main tool to control these weeds; however,Loliumspp. populations have evolved multiple- and cross-resistance to at least 14 herbicide mechanisms of action in more than 21 countries, with reports of multiple herbicide resistance to at least seven mechanisms of action in a single population. In this review, we summarize what is currently known about non-target-site resistance inLoliumspp. to acetyl CoA carboxylase, acetohydroxyacid synthase, microtubule assembly, photosystem II, 5-enolpyruvylshikimate-3-phosphate synthase, glutamine synthetase, very-long chain fatty acids, and photosystem I inhibitors. We suggest research topics that need to be addressed, as well as strategies to further our knowledge and uncover the mechanisms of non-target-site resistance inLoliumspp.