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Dominance variation across six herbicides of the Arabidopsis thaliana csr1‐1 and csr1‐2 resistance alleles
Author(s) -
Roux Fabrice,
Matéjicek Annick,
Gasquez Jacques,
Reboud Xavier
Publication year - 2005
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.1089
Subject(s) - dominance (genetics) , biology , allele , acetolactate synthase , genetics , herbicide resistance , pesticide resistance , pesticide , heterozygote advantage , agronomy , gene
Dominance of a resistance trait can be defined as a measure of the relative position of the phenotype of the heterozygote RS compared with the phenotype of the two corresponding homozygotes, SS and RR. This parameter has been shown to have primary importance in the dynamics of pesticide resistance evolution. Literature on insecticide resistance suggests that dominance levels in the presence of insecticide vary greatly from completely recessive to completely dominant. With insecticides, both the chemical applied and the dosages used have been demonstrated to affect the dominance. By contrast, almost all herbicide resistances have been found to be inherited as partially to totally dominant traits. This discrepancy between weeds and insects may partly result from the methodologies applied to measure the dominance, ie a single dose for herbicide versus several doses for insecticide. Using two well‐known resistances ( csr1‐1 and csr1‐2 ) to acetolactate synthase (ALS) inhibitors in Arabidopsis thaliana (L) Heynh (mouse‐ear cress), we used several herbicide doses to determine the dominance level to six ALS‐inhibiting herbicides. The dominance level in the presence of herbicide varied from completely dominant to completely recessive, depending on the resistance allele and the herbicide tested. The dominance of the csr1‐1 and csr1‐2 resistance alleles ranged from 0 (completely recessive) to 1.1 (dominant) and from 0 to 0.3 (partially dominant), respectively. The recessivity of some resistance alleles in the presence of herbicide could lead to the development of improved resistance management in order to delay or avoid herbicide resistance evolution, especially in the control of outcrossing weed species. Copyright © 2005 Society of Chemical Industry