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Pool of resistance mechanisms to glyphosate in digitaria insularis

AuthorsBianco de Carvalho, Leonardo; Costa Aguiar Alves, Pedro Luis da; Cruz-Hipólito, Hugo Enrique; Rojano-Delgado, Antonia María; Prado, R. del; Gil Humanes, Javier ; Barro Losada, Francisco ; Luque de Castro, María Dolores
KeywordsMechanisms of resistance
Weed resistance
Issue Date16-Dec-2011
PublisherAmerican Chemical Society
CitationJournal of Agricultural and Food Chemistry 60(2): 615-622 (2012)
AbstractDigitaria insularis biotypes resistant to glyphosate have been detected in Brazil. Studies were carried out in controlled conditions to determine the role of absorption, translocation, metabolism, and gene mutation as mechanisms of glyphosate resistance in D. insularis. The susceptible biotype absorbed at least 12% more 14C-glyphosate up to 48 h after treatment (HAT) than resistant biotypes. High differential 14C-glyphosate translocation was observed at 12 HAT, so that >70% of the absorbed herbicide remained in the treated leaf in resistant biotypes, whereas 42% remained in the susceptible biotype at 96 HAT. Glyphosate was degraded to aminomethylphosphonic acid (AMPA), glyoxylate, and sarcosine by >90% in resistant biotypes, whereas a small amount of herbicide (up to 11%) was degraded by the susceptible biotype up to 168 HAT. Two amino acid changes were found at positions 182 and 310 in EPSPS, consisting of a proline to threonine and a tyrosine to cysteine substitution, respectively, in resistant biotypes. Therefore, absorption, translocation, metabolism, and gene mutation play an important role in the D. insularis glyphosate resistance. © 2011 American Chemical Society.
Identifiersdoi: 10.1021/jf204089d
issn: 0021-8561
e-issn: 1520-5118
Appears in Collections:(IAS) Artículos
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