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1 November 2017 Seed Germination and Seedling Emergence of Blackgrass (Alopecurus myosuroides) as Affected by Non—Target-Site Herbicide Resistance
Eshagh Keshtkar, Solvejg K. Mathiassen, Roland Beffa, Per Kudsk
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Abstract

Seedling emergence traits of susceptible (S) and resistant (R) blackgrass subpopulations isolated from a single non—target-site resistant (NTSR) population were studied in controlled conditions. The seedling emergence of the R subpopulation was lower and slower than that of the S subpopulation, especially at low temperature and deep burial. The burial depth inhibiting final emergence by 50% for the R subpopulation was significantly lower than that of the S subpopulation at low temperature. The present study revealed that under suboptimal conditions the NTSR loci conferring herbicide resistance were correlated with a fitness cost in relation to seedling emergence traits. The results suggest that deep soil cultivation and delayed sowing of autumn-sown crops can hamper germination of the R more than of the S subpopulation and thus potentially reduce the prevalence of the R subpopulation in the blackgrass population.

Nomenclature: Blackgrass, Alopecurus myosuroides Huds. ALOMY.

© Weed Science Society of America, 2017
Eshagh Keshtkar, Solvejg K. Mathiassen, Roland Beffa, and Per Kudsk "Seed Germination and Seedling Emergence of Blackgrass (Alopecurus myosuroides) as Affected by Non—Target-Site Herbicide Resistance," Weed Science 65(6), 732-742, (1 November 2017). https://doi.org/10.1017/wsc.2017.44
Received: 18 March 2017; Accepted: 1 June 2017; Published: 1 November 2017
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