|TATE, TRENT - University Of Georgia|
|MCCULLOUGH, PATRICK - University Of Georgia|
|CHEN, ZHENBANG - University Of Georgia|
|RAYMER, PAUL - University Of Georgia|
Submitted to: Crop Science
Publication Type: Peer Reviewed Journal
Publication Acceptance Date: 3/5/2021
Publication Date: 3/26/2021
Citation: Tate, T.M., Mccullough, P.E., Harrison, M.L., Chen, Z., Raymer, P.L. 2021. Characterization of Acetyl Coenzyme A inhibitor resistance in turfgrass and grassy weeds. Crop Science. Special Issue. https://doi.org/10.1002/csc2.20511.
Interpretive Summary: Control of grassy weeds in turfgrass is a significant problem in the turfgrass industry. It is often difficult to control grassy weeds in turf without injury to the turfgrass itself since both the grassy weeds and the turfgrass are sensitive to the same herbicides. One way to overcome this issue is the use of turfgrasses that are naturally resistant to these herbicides. This paper identifies naturally occurring genetic mutations present in a select group of turfgrasses in an effort to better understand the resistance.
Technical Abstract: An herbicide resistance weed control system that utilizes naturally occurring mutations to ACCase inhibiting herbicides could provide herbicide selectivity and improve control of grassy weeds in turf. Knowledge regarding the presence of these mutations in grasses is needed to guide development of this type of system. This research subjected 24 species of warm-season, cool-season, and grassy weed species to rates of 0, 400, and 1200 g a.i. ha-1 of fenoxaprop herbicide and surveyed these species for the presence of site of action mutations in acetyl-coenzyme A carboxylase (ACCase) at amino acid (aa) positions 1781, 1999, 2027, 2041, 2076, 2088, and 2096. Nine species including Agrostis capillaris L., Festuca ovina L., Festuca rubra L., Lolium multiflorum Lam., Lolium perenne L., Paspalum dilatatum Poir., Poa annua L., Zoysia japonica Steud. and Z. matrella [L.] Merr. were resistant to fenoxaprop. Site of action point mutations conferring resistance to ACCase herbicides were found at aa position 1781 in only three of 24 species surveyed (Festuca ovina, Festuca rubra, and Poa annua). The information obtained from this study provide valuable guidance for the development of ACCase resistant weed control systems for turfgrass.