Characterisation of low-level pyrasulfotole resistance and the role of herbicide translocation in wild radish (Raphanus raphanistrum).

Autor: Goggin DE; Australian Herbicide Resistance Initiative, UWA School of Agriculture and Environment, University of Western Australia, 35 Stirling Highway, Crawley 6009, Australia. Electronic address: danica.goggin@uwa.edu.au., Taylor CM; Australian Herbicide Resistance Initiative, UWA School of Agriculture and Environment, University of Western Australia, 35 Stirling Highway, Crawley 6009, Australia., Busi R; Australian Herbicide Resistance Initiative, UWA School of Agriculture and Environment, University of Western Australia, 35 Stirling Highway, Crawley 6009, Australia., Flower K; Australian Herbicide Resistance Initiative, UWA School of Agriculture and Environment, University of Western Australia, 35 Stirling Highway, Crawley 6009, Australia.
Jazyk: angličtina
Zdroj: Pesticide biochemistry and physiology [Pestic Biochem Physiol] 2024 Sep; Vol. 204, pp. 106072. Date of Electronic Publication: 2024 Aug 04.
DOI: 10.1016/j.pestbp.2024.106072
Abstrakt: The synthetic auxin 2,4-D and the 4-hydroxyphenylpyruvate dioxygenase inhibitor pyrasulfotole are phloem-mobile post-emergence herbicides, the latter applied in co-formulation with either bromoxynil (a contact herbicide causing leaf desiccation) or MCPA (another synthetic auxin). Previous studies have shown a wide range of 2,4-D translocation phenotypes in resistant populations of the agricultural weed Raphanus raphanistrum, but it was hypothesised that enhanced movement out of the apical meristem could contribute to resistance. Little is known about pyrasulfotole translocation or the effect of bromoxynil on pyrasulfotole movement. Therefore, the behaviour of pyrasulfotole and 2,4-D applied to the growing point of susceptible and resistant R. raphanistrum seedlings was assessed, along with the effect of bromoxynil on pyrasulfotole translocation. The small amount of herbicide directly contacting the growing point after spraying was sufficient to induce herbicide symptoms, and there was no enhancement of translocation away from the growing point in either pyrasulfotole- or 2,4-D-resistant populations. Bromoxynil had a slightly inhibitory effect on pyrasulfotole translocation in some populations, somewhat negating the minor differences observed among populations when pyrasulfotole was applied alone. Resistance to pyrasulfotole could not explained by enhanced metabolism or vacuolar sequestration of the herbicide. Overall, differential translocation in either the treated leaves or apical meristems does not appear to be a major determinant of resistance to pyrasulfotole or 2,4-D.
Competing Interests: Declaration of competing interest None.
(Copyright © 2024 The Authors. Published by Elsevier Inc. All rights reserved.)
Databáze: MEDLINE
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