Data/hora: 12/06/2024 13:50:54

Provedor de dados: 	87	
País: 	Brazil	
Título: 	Degradation Enhancement as the Mechanism of Resistance to Imazethapyr in Barnyardgrass	
Autores: 	DALAZEN,G.; PISONI,A.; RAFAELI,R.S.; MEROTTO JR.,A.	
Data: 	2018-01-01	
Ano: 	2018	
Palavras-chave: 	Echinochloa crus-galli; Herbicide detoxification; Weed resistance; Imidazolinones; CytP450.	
Resumo: 	ABSTRACT: Non-target site (NTS) herbicide resistance by degradation enhancement is an increasing problem in several weeds around the world. In this study, the occurrence of degradation enhancement by cytochrome P450 monooxygenases (cytP450) was evaluated as the mechanism of resistance to imazethapyr in barnyardgrass. The cytP450 inhibitors malathion and piperonyl butoxide (PBO) and the inducer naphthalic anhydride (NA), applied in mixture or sequentially with imazethapyr, were evaluated on imidazolinone-susceptible and -resistant barnyardgrass byotipes. In addition, the degradation of imazethapyr was analyzed in plants treated with imazethapyr applied alone or two hours after malathion or NA. The spraying of malathion and PBO reduced the resistance factor (RF) from 15.92 to 3.44 and 4.99, respectively, in the resistant population PALMS01. Conversely, the cytP450 inducer NA increased the RF from 4.45 to 8.32. Malathion increased imazethapyr concentrations in resistant barnyardgrass in comparison with plants sprayed with the herbicide alone, indicating the inhibition of imazethapyr degradation. The simultaneous spraying of malathion and imazethapyr was less efficient than the previous application of this cytP450 inhibitor. These results indicate that degradation enhancement caused by cytP450 enzymes is involved in the resistance mechanism of barnyardgrass to imazethapyr, and appropriate measures should be taken to manage these populations.	
Tipo: 	Info:eu-repo/semantics/article	
Idioma: 	Inglês	
Identificador: 	http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-83582018000100317	
Editor: 	Sociedade Brasileira da Ciência das Plantas Daninhas	
Relação: 	10.1590/s0100-83582018360100119	
Formato: 	text/html	
Fonte: 	Planta Daninha  v.36 2018	
Fonte: 	info:eu-repo/semantics/openAccess