Identifying the basis of dual glyphosate and paraquat resistance in Lolium rigidum selected at reduced rates of glyphosate

The recurrent selection with sub-optimal glyphosate dose on a susceptible ryegrass population can lead to glyphosate resistance.  Preliminary results also showed cross-resistance to the unrelated herbicide paraquat.  The aim is to investigate the resistance profile to other unrelated herbicide modes of action and the resistance mechanism to glyphosate and paraquat with physiological and biochemical work quantifying uptake and translocation of radioactive 14C herbicides and plant defence enzymatic activity.

Project Leader:  Professor Stephen Powles