Evolution of Resistance to Auxinic Herbicides: Historical Perspectives, Mechanisms of Resistance, and Implications for Broadleaf Weed Management in Agronomic Crops

Auxinic herbicides are widely used for control of broadleaf weeds in cereal crops and turfgrass. These herbicides are structurally similar to the natural plant hormone auxin, and induce several of the same physiological and biochemical responses at low concentrations. After several decades of resear...

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Bibliographic Details
Published in:Weed science 2011-10, Vol.59 (4), p.445-457
Main Authors: Mithila, J., Hall, J. Christopher, Johnson, William G., Kelley, Kevin B., Riechers, Dean E.
Format: Article
Language:English
Subjects:
Agricultural production
alleles
Auxins
Biological and medical sciences
biotypes
broadleaf weeds
case studies
Chemical control
Crops
Evolution
Fundamental and applied biological sciences. Psychology
grain crops
Herbicide resistance
Herbicide resistant weeds
Herbicides
inheritance (genetics)
Magnoliopsida
mechanism of action
Mustards
mutation
Parasitic plants. Weeds
Pesticidal action
physiological response
Phytopathology. Animal pests. Plant and forest protection
Plant growth
plant hormones
Plants
receptors
resistance mechanisms
REVIEW
Signal transduction
turf grasses
Weed control
Weeds
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Summary:Auxinic herbicides are widely used for control of broadleaf weeds in cereal crops and turfgrass. These herbicides are structurally similar to the natural plant hormone auxin, and induce several of the same physiological and biochemical responses at low concentrations. After several decades of research to understand the auxin signal transduction pathway, the receptors for auxin binding and resultant biochemical and physiological responses have recently been discovered in plants. However, the precise mode of action for the auxinic herbicides is not completely understood despite their extensive use in agriculture for over six decades. Auxinic herbicide-resistant weed biotypes offer excellent model species for uncovering the mode of action as well as resistance to these compounds. Compared with other herbicide families, the incidence of resistance to auxinic herbicides is relatively low, with only 29 auxinic herbicide-resistant weed species discovered to date. The relatively low incidence of resistance to auxinic herbicides has been attributed to the presence of rare alleles imparting resistance in natural weed populations, the potential for fitness penalties due to mutations conferring resistance in weeds, and the complex mode of action of auxinic herbicides in sensitive dicot plants. This review discusses recent advances in the auxin signal transduction pathway and its relation to auxinic herbicide mode of action. Furthermore, comprehensive information about the genetics and inheritance of auxinic herbicide resistance and case studies examining mechanisms of resistance in auxinic herbicide-resistant broadleaf weed biotypes are provided. Within the context of recent findings pertaining to auxin biology and mechanisms of resistance to auxinic herbicides, agronomic implications of the evolution of resistance to these herbicides are discussed in light of new auxinic herbicide-resistant crops that will be commercialized in the near future.
ISSN:0043-1745
1550-2759
DOI:10.1614/WS-D-11-00062.1