Potential of plant species for bioremediation of soils applied with imidazolinone herbicides

Abstract

-Imidazolinone herbicides present physicochemical characteristics that allow them to persist longer in environment, with increased chances of soil and water contamination, as well as carryover effects on subsequent crops. Phytoremediation is shown as a promising technique to decontaminate soils polluted by herbicides. The aim of this study was to assess the potential of some winter grown species in removing residuals from soils contaminated with imazethapyr + imazapic and imazapic + imazapyr, using pre-emergence to control weeds in summer grown rice fields. The experiment was conducted in a completely randomized design, with four replications. All species were subjected to herbicide application at different doses. Imazethapyr + imazapic and imazapyr + imazapic were applied at doses of 0.0, 1.0 and 2.0 L ha , respectively, in pre-emergence of the species. Brassica napus and Festuca arundinaceae are not tolerant to herbicides, with 100% of phytotoxicity (plant death) for all doses assessed. The herbicide imazapyr + imazapic proved to be less selective, causing the highest phytotoxicity in the species tested. The most tolerant species to the herbicides was Vicia sativa, which may be the most suitable one for phytoremediation programs in areas contaminated with imazethapyr + imazapic and imazapyr + imazapic. Keywords: bioremediation, ALS inhibitors, Vicia sativa. RESUMO -Os herbicidas pertencentes ao grupo químico das imidazolinonas apresentam características físico-químicas que lhes permitem persistir no ambiente por longos períodos. Assim, objetivou-se com este trabalho avaliar o potencial de espécies cultivadas como pastagens, cobertura verde no inverno e/ou produtoras de grãos em remediar solos contaminados com imazethapyr + imazapic e imazapyr + imazapic, usados para o controle de plantas daninhas em lavouras de arroz irrigado. Para isso, o experimento foi conduzido em delineamento inteiramente casualizado com quatro repetições. As espécies

Tolerance of Annual Winter Species to Protoporfirinogen Oxidase Inhibiting Herbicides (Protox)

“…Vetch, radish and lupine were the species that showed the smallest symptoms of phytotoxicity, with a linear increase as the doses of sulfentrazone increased ( Figure 1B). In a study conducted by Galon et al (2014), vetch presented the lowest phytotoxicity when it was submitted to the application of imazapic + imazapyr; this resembles the results found in this study in relation to sulfentrazone.…”

“…Birdsfood trefoil and black oat had high phytotoxicity values, with the death of the former and injuries near 80% for the latter at the highest dose of sulfentrazone (1.2 kg ha -1 ). Galon et al (2014) observed severe phytotoxicity symptoms of imazethapyr + imazapic and imazapyr + imazapic on wild oat and radish when using these species as potential soil phytoremediation agents. Krenchinski et al (2013), when evaluating the phytotoxicity of two different glyphosate formulations (Zapp QI ® -ZQ e Glyphosate 480 Agripec® -GA), observed that four days after the application of ZQ, the species with the highest phytotoxicity was the white oat.…”

“…There are only few studies about the phytoremediation of soils contaminated by herbicides, especially in the state of Rio Grande do Sul. Some studies have already demonstrated that the species Stizolobium aterrimum, Canavalia ensiformis, Dolichos lablab and Eleusine coracana are demonstrably efficient in the decontamination of areas treated with trifloxysulfuron-sodium, tebuthiuron, picloram and sulfentrazone (Santos et al, 2007;Belo et al, 2011;Madalão et al, 2012), Vicia sativa and Lolium multiflorum to clean soils contaminated with imazethapyr + imazapic and imazapyr + imazapic (Galon et al, 2014), commercial mixtures used for the weed management of irrigated rice. It is known that the probable mechanism involved in soil decontamination by these species occurs through the interaction of phytostimulation and phytodegradation.…”

Eficácia e fitotoxicidade de herbicidas aplicados para manejo de plantas daninhas infestantes do trigo

“…+ imazapic (25 g L -1 of i.a.). Corroborating the results found in this paper, Galon et al (2014b) and Santos et al (2014) also 133 Rev. Bras.…”

OPTIMIZATION OF Cr AND Cu BIOSORPTION BY GREEN MARINE ALGAE Caulerpa racemosaVar. Cylindracea & Ulva lactuca

“…Biological treatments are environment friendly and cost effective process applied using biological materials such as algae [2][3] [4], living or non-living bacteria [5][6] [7], yeast [8][9], fungi [10][11] and plants [12] [13]. Biosorption is a process of removal of toxic heavy metals from the waste water using biological material which is alternative treatment technology involves biosorbent containing favorable functional groups and a solvent/liquid with dissolved sorbate group.…”