Fecha/hora: 16/06/2024 14:45:53

Biblioteca(s): | INIA Treinta y Tres.
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