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Geographical variation in resistance to acetyl‐coenzyme A carboxylase‐inhibiting herbicides across the range of the arable weed Alopecurus myosuroides (black‐grass)
Author(s) -
Délye Christophe,
Michel Séverine,
Bérard Aurélie,
Chauvel Bruno,
Brunel Dominique,
Guillemin JeanPhilippe,
Dessaint Fabrice,
Le Corre Valérie
Publication year - 2010
Publication title -
new phytologist
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 3.742
H-Index - 244
eISSN - 1469-8137
pISSN - 0028-646X
DOI - 10.1111/j.1469-8137.2010.03233.x
Subject(s) - biology , weed , resistance (ecology) , allele , agronomy , arable land , acetyl coa carboxylase , botany , genetics , gene , pyruvate carboxylase , ecology , agriculture , biochemistry , enzyme
Summary• The geographical structure of resistance to herbicides inhibiting acetyl‐coenzyme A carboxylase (ACCase) was investigated in the weed Alopecurus myosuroides (black‐grass) across its geographical range to gain insight into the process of plant adaptation in response to anthropogenic selective pressures occurring in agricultural ecosystems. • We analysed 297 populations distributed across six countries in A. myosuroides ’ main area of occupancy. The frequencies of plants resistant to two broadly used ACCase inhibitors and of seven mutant, resistant ACCase alleles were assessed using bioassays and genotyping, respectively. • Most of the resistance was not endowed by mutant ACCase alleles. Resistance and ACCase allele distribution patterns were characterized by mosaicism. The prevalence of resistance and of ACCase alleles differed among countries. • Resistance clearly evolved by redundant evolution of a set of resistance alleles or genes, most of which remain unidentified. Resistance in A. myosuroides was shaped by variation in the herbicide selective pressure at both the individual field level and the national level.