Biodegradation of the herbicides imazethapyr and imazapic in rhizosphere soil of six plant species/Biodegradacao dos herbicidas imazetapir e imazapique em solo rizosferico de seis especies vegetais

Phytostimulation is a technique of phytoremediation that can be used to reduce the concentration of herbicides in the soil. It is necessary to select plants that stimulate the activity of the rizosphere degrading microorganism. The aim of this study was to evaluate the activity of the biodegradation...

Ausführliche Beschreibung

Gespeichert in:
Bibliographische Detailangaben
Veröffentlicht in:Ciência rural 2013-10, Vol.43 (10), p.1790
Hauptverfasser: Souto, Kelen Muller, Jacques, Rodrigo Josemar Seminoti, de Avila, Luis Antonio, de Oliveira Machado, Sergio Luiz, Zanella, Renato, Refatti, Joao Paulo
Format: Artikel
Sprache:spa
Schlagworte:
Online-Zugang:Volltext
Tags: Tag hinzufügen
Keine Tags, Fügen Sie den ersten Tag hinzu!
Beschreibung
Zusammenfassung:Phytostimulation is a technique of phytoremediation that can be used to reduce the concentration of herbicides in the soil. It is necessary to select plants that stimulate the activity of the rizosphere degrading microorganism. The aim of this study was to evaluate the activity of the biodegradation of the herbicide compound formulated mixture of imazethapyr + imazapic (75 + and 25 g [L.sup.-1]) in rhizosphere soil from six plant species with potential for phytostimulation. Biodegradation of the herbicide in the rhizosphere soil of Canavalia ensiformis, Glycine max, Lolium multiflorum, Lotus corniculatus, Stizolobium aterrimum and Vicia sativa, and a control (soil without plant) was evaluated at doses of 0, 250, 500, 1.000 and 4.000mL 1 ha, by quantifying the production of C-C[O.sub.2] of the soil and the degradation of the herbicide from the soil by liquid chromatography coupled to mass spectrometry. The production of C-C[O.sub.2] of the soil after the contamination with the mixture imazethapyr + imazapic was higher in the rhizosphere soil of the six plant species when compared to soil not cultivated. The rhizospheric soil from Stizolobium aterrimum shouwed the highest degradation of the herbicide imazetapyr on the highest doses evaluated, being a promising specie for phytostimulation. Key words: rice, rhizosphere, microorganisms, phytoremediation, phytostimulation. A fitoestimulacao e uma das tecnicas de fitorremediacao que pode ser utilizada para a reducao da concentracao dos herbicidas no solo. Para tanto e necessario a selecao de plantas que estimulem a atividade dos microrganismos degradadores da rizosfera. O objetivo deste trabalho foi avaliar a biodegradacao de cinco doses do herbicida composto pela mistura formulada de imazetapir+imazapique (75 + 25 g e.a. [L.sup.-1]) em solo rizosferico proveniente de seis especies vegetais com potencial para a fitoestimulacao. A biodegradacao do herbicida nas doses de 0, 250, 500, 1.000 e 4.000mL [ha.sup.-1] no solo rizosferico de Canavalia ensiformis, Glycine max, Lolium multiflorum, Lotus corniculatus, Stizolobium aterrimum, Vicia sativa e no solo sem cultivo foi avaliada atraves da quantificacao da producao de C-C[O.sub.2] do solo e da degradacao do herbicida no solo por cromatografia liquida acoplada a espectrometria de massa. A producao de C-C[O.sub.2] do solo apos a contaminacao com a mistura de imazetapir+imazapique foi maior nos solos rizosfericos das seis especies vegetais se comparado ao solo nao culti
ISSN:0103-8478