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- Title
Resistance to quinclorac and ALS-inhibitor herbicides inGalium spuriumis conferred by two distinct genes.
- Authors
Van Eerd, L. L.; McLean, M. D.; Stephenson, G. R.; Hall, J. C.
- Abstract
Classical Mendelian experiments were conducted to determine the genetics and inheritance of quinclorac and acetolactate synthase (ALS)-inhibitor resistance in a biotype of Galium spurium. Plants were screened with the formulated product of either quinclorac or the ALS-inhibitor, thifensulfuron, at the field dose of 125 or 6 g active ingredient (a.i.) ha-1 respectively. Segregation in the F2 generation indicated that quinclorac resistance was a single, recessive nuclear trait, based on a 1:3 segregation ratio [resistant : susceptible (R:S)]. Resistance to ALS inhibitors was due to a single, dominant nuclear trait, segregating in the F2 generation in a 3:1 ratio (R:S). The genetic models were confirmed by herbicide screens of F1 and backcrosses between the F1 and the S parent. F2 plants that survived quinclorac treatment set seed and the resulting F3 progeny were screened with either herbicide. Quinclorac-treated F3 plants segregated in a 1:0 ratio (R:S), hence F2 progenitors were homozygous for quinclorac resistance. In contrast, F3 progeny segregated into three ratios: 1:0, 3:1 and 0:1 (R:S) in response to ALS-inhibitor treatment. This segregation pattern indicates that their F2 parents were either homozygous or heterozygous for ALS-inhibitor resistance. Therefore, there were clearly two distinct resistance mechanisms encoded by two genes that were not tightly linked as demonstrated by segregation patterns of the F3.
- Subjects
HERBICIDES; ACETOLACTATE synthase; WEED control; VEGETATION management; PLANT genetics; ECOLOGY
- Publication
Weed Research, 2004, Vol 44, Issue 5, p355
- ISSN
0043-1737
- Publication type
Article
- DOI
10.1111/j.1365-3180.2004.00408.x