title: Inheritance and physiological basis for 2,4-D resistance in prickly lettuce (Lactuca serriola L.).
abstract: Experiments were conducted to determine the inheritance and physiological basis for resistance to the synthetic auxinic herbicide (2,4-dichlorophenoxy)acetic acid (2,4-D) in a prickly lettuce biotype. Inheritance of 2,4-D resistance in prickly lettuce is governed by a single codominant gene. Absorption and translocation were conducted using (14)C-2,4-D applied to 2,4-D-resistant and -susceptible biotypes. At 96 h after treatment (HAT), the resistant biotype absorbed less applied 2,4-D and retained more 2,4-D in the treated portion of the leaf compared to the susceptible biotype. The resistant biotype translocated less applied 2,4-D to leaves above the treated leaf and crown at 96 HAT compared to the susceptible biotype. No difference in the rate of metabolism of 2,4-D was observed between the two biotypes. Resistance to 2,4-D appears to originate from a reduced growth deregulatory and overstimulation response compared to the susceptible biotype, resulting in lower translocation of 2,4-D in the resistant prickly lettuce biotype.
authors.affiliation: Department of Crop and Soil Sciences, Washington State University, Pullman, Washington 99164, United States.
authors.forename: Dilpreet S
authors.initials: DS
authors.lastname: Riar
authors.forename: Ian C
authors.initials: IC
authors.lastname: Burke
authors.forename: Joseph P
authors.initials: JP
authors.lastname: Yenish
authors.forename: Jared
authors.initials: J
authors.lastname: Bell
authors.forename: Kulvinder
authors.initials: K
authors.lastname: Gill
mesh_terms: D015084:2,4-Dichlorophenoxyacetic Acid / Q000378:metabolism* / Q000494:pharmacology; D000042:Absorption; D053209:Herbicide Resistance / Q000235:genetics* / Q000502:physiology*; D006540:Herbicides / Q000378:metabolism* / Q000494:pharmacology; D018545:Lactuca / Q000187:drug effects* / Q000235:genetics* / Q000378:metabolism; D018515:Plant Leaves / Q000378:metabolism
chemical_list: D006540:Herbicides; D015084:2,4-Dichlorophenoxyacetic Acid