Fecha/hora: 10/06/2024 16:04:15

Biblioteca(s): 	INIA Treinta y Tres.	
Fecha corriente: 	27/04/2020	
Fecha de la última actualización: 	08/02/2021	
Autoria: 	DIEZ VIGNOLA, M.; SAINZ, M.; SALDAIN, N.E.; MARCHESI, C.; BONNECARRERE, V.; DÍAZ GADEA, P.	
Afiliación: 	MANUEL DIEZ VIGNOLA, Facultad de Agronomía, UDELAR UY.; MARTHA SAINZ, Facultad de Agronomía, UDELAR UY.; NÉSTOR ELIO SALDAIN CROCCE, INIA (Instituto Nacional de Investigación Agropecuaria), Uruguay; CLAUDIA ELIZABETH MARCHESI GYERMAN, INIA (Instituto Nacional de Investigación Agropecuaria), Uruguay; MARIA VICTORIA BONNECARRERE MARTINEZ, INIA (Instituto Nacional de Investigación Agropecuaria), Uruguay; PEDRO DÍAZ GADEA, Facultad de Agronomía, UDELAR UY.	
Título: 	Limited induction of ethylene and cyanide synthesis are observed in quinclorac-resistant barnyardgrass (Echinochloa crus-galli) in Uruguay.	
Año de publicación: 	2020	
Fuente/Imprenta: 	Weed Science, 1 July 2020, Volume 68, Issue 4, Pages 348-357. Doi: https://doi.org/10.1017/wsc.2020.32	
DOI: 	https://doi.org/10.1017/wsc.2020.32	
Idioma: 	Inglés	
Notas: 	Article history: Article accepted and Published online by Cambridge University Press: 28 April 2020	
Contenido: 	Abstract: Barnyardgrass [Echinochloa crus-galli (L.) P. Beauv] is the foremost weed in rice (Oryza sativa L.) systems and its control is crucial to successful rice production. Quinclorac, a synthetic auxin herbicide, has been used effectively to manage E. crus-galli. However, the occurrence of quinclorac-resistant genotypes are frequently reported, and its resistance evolution has questioned the continued utility of quinclorac for grass control. Identification of the resistance mechanism(s) of resistant genotypes will facilitate development of integrated weed management strategies that sustain quinclorac use for management of E. crus-galli. We evaluated the responses to quinclorac of two contrasting genotypes: E7 (resistant, R) and LM04 (susceptible, S). Quinclorac induced ethylene and cyanide biosynthesis in the S-genotype. Both genotypes responded similarly to an increasing application of exogenous 1-carboxylic acid aminocyclopropane (ACC) and potassium cyanide (KCN), and their growth was inhibited at higher doses. The key mechanism for cyanide (HCN) detoxification in plants, &#946;-cyanoalanine synthase (&#946;-CAS) activity, was evaluated in both genotypes, and no significant difference was observed in the basal activity. However, quinclorac significantly induced &#946;-CAS-like activity in the S-genotype, which is consistent with the increased synthesis of ethylene and cyanide. This work suggests that the resistance to quinclorac of the E7 R-genotype is likely related to an alteration in the auxin signal transduction pathway, causing a lower stimulation of ACC synthase and, therefore, limited synthesis of ethylene and HCN after quinclorac treatment.	
Palabras-Clave: 	?-CYANOALANINE; AUXIN HERBICIDE; BARNYARDGRASS; RECISTANCE; RICE.	
Thesagro: 	ARROZ.	
Categoría del tema: 	H60 Malezas y escardas	
Registro original: 	INIA Treinta y Tres (TT)	
Ejemplares: 	TT - (103091-1) - PXI - AP - DD - PP/weed Science/2020 -  -  - DIS