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Two Distinct Alleles Encode for Acetyl-CoA Carboxylase Inhibitor Resistance in Wild Oat (Avena fatua)

Published online by Cambridge University Press:  12 June 2017

Bruce G. Murray ,
Anita L. Brûlé-Babel  and
Ian N. Morrison
Bruce G. Murray
Affiliation:
Dep. Plant Sci., Univ. Manitoba, Winnipeg, Manitoba, Canada, R3T 2N2
Anita L. Brûlé-Babel
Affiliation:
Dep. Plant Sci., Univ. Manitoba, Winnipeg, Manitoba, Canada, R3T 2N2
Ian N. Morrison
Affiliation:
Dep. Plant Sci., Univ. Manitoba, Winnipeg, Manitoba, Canada, R3T 2N2
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Abstract

The objectives of this study were to determine the inheritance of aryloxyphenoxypropionate (APP) resistance in the wild oat population UM33 and to determine the genetic relationship between resistance in UM33 and another population, UM1, which has a different cross-resistance pattern. Reciprocal crosses were made between UM33 and a susceptible population UM5, and between UM33 and UM1. Initial screenings of F1 and F2 Is populations derived from crosses between UM33 and UM5 were conducted over a range of fenoxaprop-P rates to determine a discriminatory dosage. F2 populations and F2-derived F3 families were then screened at this dosage (1200 g ai ha−1) to determine segregation patterns. Results from reciprocal UM33 x UM5 F1 dose-response experiments, and F2 and F2-derived F3 segregation experiments indicated that UM33 resistance to fenoxaprop-P was governed by a single, partially dominant nuclear gene system. To determine if resistance in UM1 and UM33 results from alterations at the same gene locus, 584 F2 plants derived from reciprocal UM33 x UM1 crosses were screened with 150 g ha−1 fenoxaprop-P. This dosage was sufficient to kill susceptible plants (UM5), but was not sufficient to kill plants with a resistance allele from either parent. None of the treated F2 plants exhibited injury or death, indicating that UM1 and UM33 resistance genes did not segregate independently. From this it was concluded that resistance in both populations is encoded at the same gene locus.

Keywords

Fenoxaprop-p-ethyl, (+)-ethyl 2-[4-[(6-chloro-2-benzoxazolyl)oxy]phenoxy]propanoatewild oat, Avena fatua L. ♯AVEFAAryloxyphenoxypropionatecyclohexanedioneACCase inhibitorherbicide resistanceweed geneticsAVEFA
Type
Physiology, Chemistry, and Biochemistry
Information
Weed Science , Volume 44 , Issue 3 , September 1996 , pp. 476 - 481
Copyright
Copyright © 1996 by the Weed Science Society of America 

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