Seed Germination and Seedling Emergence of Blackgrass (Alopecurus myosuroides) as Affected by Non–Target-Site Herbicide Resistance. Issue 6 (17th August 2017)

• Record Type: Journal Article
• Authors: Keshtkar, Eshagh; Mathiassen, Solvejg K.; Beffa, Roland; Kudsk, Per
• Is Part Of: Weed science. Volume 65: Issue 6(2017)
• Page Start: 732
• Page End: 742
• Publication Date: 2017-08-17
• Subjects: Blackgrass, -- Alopecurus myosuroides Huds. ALOMY.; Final seed germination, -- final seedling emergence, -- fitness penalty, -- NTSR.; 632.505
• DOI: 10.1017/wsc.2017.44
• Languages: English
• ISSNs: 0043-1745

Abstract

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.