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Resistance to chlortoluron in a downy brome (Bromus tectorum) biotype

Published online by Cambridge University Press:  20 January 2017

Julio Menendez ,
Fernando Bastida  and
Rafael de Prado
Fernando Bastida
Affiliation:
Departamento de Ciencias Agroforestales, Escuela Politecnica Superior, Campus Universitario de La Cartuja, 21819 Palos de la Frontera, Huelva, Spain
Rafael de Prado
Affiliation:
Departamento de Química Agrícola, Campus de Rabanales, 14071 Córdoba, Spain
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Abstract

A downy brome population in a winter wheat field at Córdoba, Spain, survived use rates of chlortoluron (2.5 to 3.5 kg ai ha−1) over 2 consecutive yr, where wheat monoculture and multiple annual chlortoluron applications had been carried out. The resistant (CR) biotype showed a higher ED50 value (7.4 kg ai ha−1; the concentration required for 50% reduction of fresh weight) than the susceptible (S) control (2.2 kg ai ha−1), with a 3.4-fold increase in chlortoluron tolerance. Chlortoluron resistance in the CR downy brome biotype was not caused by altered absorption, translocation, or modification of the herbicide target site but by enhanced detoxification. The inhibition of both the recovery of photosynthetic electron transport and chlortoluron metabolism in the CR biotype due to the presence of the Cyt P450 inhibitor 1-aminobenzotriazole (ABT) indicates that herbicide metabolism catalyzed by Cyt P450 monooxygenases is related to chlortoluron resistance in CR plants. Although both biotypes degraded chlortoluron by N-dealkylation and ring-methyl hydroxylation and seem to share the same ability to form polar conjugates, degradation in the resistant biotype is more efficacious as this biotype metabolizes the parent herbicide faster and to a greater extent than its susceptible counterpart. The ability of the susceptible biotype to ring-hydroxylate chlortoluron, albeit at much slower rate, probably explains its moderate tolerance to chlortoluron observed in the growth assays and its minor photosynthetic electron transport recovery observed in fluorescence measurements.

Keywords

Chlortolurondowny brome, Bromus tectorum L. BROTEPhotosynthetic-inhibiting herbicidesphenylureasfluorescence inductionHill reactionherbicide metabolism
Type
Physiology, Chemistry, Biochemistry
Information
Weed Science , Volume 54 , Issue 2 , April 2006 , pp. 237 - 245
Copyright
Copyright © Weed Science Society of America 

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