Fecha/hora: 06/06/2024 12:51:43

Biblioteca(s): 	INIA Treinta y Tres.	
Tipo de la producción científica: 	Artículos en Revistas Indexadas Internacionales	
Circulación/Nivel: 	A - 1	
Fecha corriente: 	15/09/2014	
Fecha de la última actualización: 	11/10/2019	
Autoria: 	YASOUR, H.; OSUNA, M.D.; ORTIZ, A.; ECKERT, J.W.; FISHER, A.J.; SALDAIN, N.	
Afiliación: 	NESTOR ELIO SALDAIN CROCCE, Instituto Nacional de Investigación Agropecuaria (INIA), Uruguay.	
Título: 	Mechanism of resistance to penoxsulam in late watergrass [Echinochloa phyllopogon (stapf) koss.].	
Año de publicación: 	2009	
Fuente/Imprenta: 	Journal of Agricultural and Food Chemistry, 2009, v. 57. n. 9, p. 3653-3660.	
ISSN: 	0021-8561	
DOI: 	10.1021/jf8039999	
Idioma: 	Inglés	
Notas: 	Article history: Received for Review December 23, 2008 // Accepted March 11, 2009 // Revised manuscript received March 9, 2009.
DOI: https://doi.org/10.1021/jf8039999	
Contenido: 	Abstract
Late watergrass [Echinochloa phyllopogon (Stapf.) Koss.] is a major weed of California rice that has evolved P450-mediated metabolic resistance to multiple herbicides. Resistant (R) populations are also poorly controlled by the recently introduced herbicide penoxsulam. Ratios (R/S) of the R to susceptible (S) GR50 (herbicide rate for 50% growth reduction) ranged from 5 to 9. Although specific acetolactate synthase (ALS) activity was 1.7 higher in R than in S plants, the enzyme in R plants was about 6 times more susceptible to the herbicide. R plants exhibited faster (2.8 times) oxidative [14C]-penoxsulam metabolism than S plants 24 h after treatment. Addition of malathion (P450 inhibitor) enhanced herbicide phytotoxicity and reduced penoxsulam metabolism in R plants. Tank mixtures with thiobencarb (can induce P450) antagonized penoxsulam toxicity in R plants, suggesting penoxsulam may be broken down by a thiobencarb-inducible enzyme. These results suggest E. phyllopogon resistance to penoxsulam is mostly due to enhanced herbicide metabolism, possibly via P450 monooxidation.	
Thesagro: 	ARROZ; ARROZ IRRIGADO; ECHINOCHLOA PHYLLOPOGON; ESCARDA; HERBICIDAS; PENOXSULAN.	
Categoría del tema: 	H60 Malezas y escardas	
Registro original: 	INIA Treinta y Tres (TT)	
Ejemplares: 	TT - (100047-1) - PXI - AP - DD - pp/Saldain/Arb/2009/1 -  -  - DIS