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Mechanisms of resistance to acetolactate synthase‐inhibiting herbicides in populations of Apera spica‐venti from the Czech Republic
Author(s) -
Hamouzová Kateřina,
Košnarová Pavlína,
Salava Jaroslav,
Soukup Josef,
Hamouz Pavel
Publication year - 2014
Publication title -
pest management science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.296
H-Index - 125
eISSN - 1526-4998
pISSN - 1526-498X
DOI - 10.1002/ps.3563
Subject(s) - acetolactate synthase , genetics , biology , population , allele , gene , medicine , environmental health
BACKGROUND This study investigates the mechanisms of resistance to acetolactate synthase‐inhibiting herbicides in populations of Apera spica‐venti (L.) P.B. from the Czech Republic . RESULTS The proportion of resistance due to mutant acetolactate synthase ( ALS ) alleles was estimated by genotyping individuals from each of three populations for the eight ALS mutations known to confer resistance. Four resistance‐conferring ALS mutations were identified: Pro‐197‐Ala, Pro‐197‐Thr, Trp‐574‐Leu and previously unreported Trp‐574‐Met substitution. Two populations ( R1 , R3 ) have amino acid substitution at positions Pro‐197 and Trp‐574. Individuals from the R3 population had two different resistance alleles. In the R2 population, only the resistant Trp‐574‐Met substitution was detected. Ten other single point mutations were identified, but these were not related to resistance . The cytochrome malathion decreased chlorsulfuron resistance in the resistant populations that were examined. Although malathion increased mortality, the GR 50 values were too high to conclude that non‐target‐based mechanism was the main one for the resistance in Apera spica‐venti populations tested in this study . CONCLUSIONS Individuals of Apera spica‐venti populations tested in this study possess the target‐site ALS resistance mutation and an additional so far unknown resistance mechanism(s). © 2013 Society of Chemical Industry