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Dintroaniline Herbicide Resistance in Rigid Ryegrass (Lolium rigidum)

Published online by Cambridge University Press:  12 June 2017

Fiona M. McAlister ,
Joseph A. M. Holtum  and
Stephen B. Powles
Fiona M. McAlister
Affiliation:
Dep. Crop Prot., University of Adelaide, Waite Institute Campus, Adelaide, South Australia 5064
Joseph A. M. Holtum
Affiliation:
Dep. Crop Prot., University of Adelaide, Waite Institute Campus, Adelaide, South Australia 5064
Stephen B. Powles
Affiliation:
Dep. Crop Prot., University of Adelaide, Waite Institute Campus, Adelaide, South Australia 5064
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Abstract

Thirteen biotypes of rigid ryegrass were screened for trifluralin resistance. From these, the two most resistant biotypes, SLR 31 and SLR 10, were chosen for further studies involving exposure to other dinitroanilines, mitosis-inhibiting herbicides and 14C-trifluralin. SLR 31, and SLR 10 exhibited an approximate 10-fold reduced sensitivity to trifluralin in comparison to susceptible biotypes. Resistance to five other dinitroaniline herbicides was observed, with reduced sensitivity varying from 32-fold for ethalfluralin to 2.5-fold for isopropalin. The resistance in rigid ryegrass to other herbicides and drugs that affect mitosis were tested. Resistance comparable to that of trifluralin was recorded for the herbicides terbutol and DCPA, while low levels of cross-resistance to amiprophosmethyl was present. Trifluralin affected mitotic indices at a much lower level in the susceptible biotypes than in the resistant biotypes. No differences in the uptake and translocation of 14C-trifluralin were observed between resistant and susceptible biotypes. Most of the 14C detected in the plant material was in the root tissue. A small level of 14C was detected in the seeds, and no substantial increases were noted in coleoptile tissue. The resistance spectra in SLR 31 and SLR 10 were phenotypically similar to those occurring in an intermediate trifluralin-resistant goosegrass and trifluralin-resistant green foxtail.

Keywords

Amiprophosmethyl, S-2-diethylaminoethyl-O,O-diethylphosphothiateDCPA, dimethyl 2,3,5,6-tetrachloro-1,4-benzenedicarboxylateethalfluralin, (N-ethyl-N-(2-methyl-2-propenyl)-2,6-dinitro-4-(trifluoromethyl)benzenamine)isopropalin, (4-(1-methylethyl)-2,6-dinitro-N,N-dipropylbenzenamine)terbutol, 2-6-di-tert-butyl-p-tolylmethylcarbamatetrifluralin, 2,6-dinitro-N,N-dipropyl-4-(trifluoromethyl)benzenaminegoosegrass, Eleusine indica (L.) Gaertn. #3 ELEINgreen foxtail, Setaria viridis (L.) Beauv. # SETVIrigid ryegrass, Lolium rigidum Gaudin # LOLRITrifluralinannual ryegrassmultiple herbicide resistancecross resistanceELEINSETVILOLRI
Type
Physiology, Chemistry, and Biochemistry
Information
Weed Science , Volume 43 , Issue 1 , March 1995 , pp. 55 - 62
Copyright
Copyright © 1995 by the Weed Science Society of America 

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