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(Reference retrieved automatically from SciELO through information on FAPESP grant and its corresponding number as mentioned in the publication by the authors.)

Acute Toxicity of Herbicides and Sensibility of Aquatic Plant Wolffia brasiliensis as a Bioindicator Organism

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Author(s):
P.C. PEREIRA [1] ; I.A. BRUNETTI [2] ; K.S. CASTRO [3] ; L.F. CHIAROTTI [4] ; B.E. SANTOS [5] ; J.C. MORAES [6] ; C. CRUZ [7]
Total Authors: 7
Affiliation:
[1] Fundação Educacional de Barretos - Brasil
[2] Universidade Estadual Paulista - Brasil
[3] Fundação Educacional de Barretos - Brasil
[4] Fundação Educacional de Barretos - Brasil
[5] Fundação Educacional de Barretos - Brasil
[6] Fundação Educacional de Barretos - Brasil
[7] Fundação Educacional de Barretos - Brasil
Total Affiliations: 7
Document type: Journal article
Source: Planta Daninha; v. 37, 2019-09-30.
Abstract

ABSTRACT: This study aimed to establish the mass cultivation of Wolffia brasiliensis under laboratory conditions, determine the sensitivity of reference substances (potassium dichromate, sodium chloride, and potassium chloride), and estimate the acute toxicity (LC50;7d) for the herbicide glyphosate, diquat, paraquat, imazapyr, 2,4-D, saflufenacil, imazamox, penoxsulam, metsulfuron-methyl, and atrazine. Three media were tested for culture establishment: Hoagland’s medium, 5.0 g L-1 NPK fertilizer (20-5-20), a mixture of Oxisol + organic substrate of decaying aquatic plant (2:1; v v-1). Sensitivity tests with reference substances and acute toxicity for herbicides were carried out after establishing the cultivation. The species W. brasiliensis presented an excellent sensitivity response to reference substances, with means of LC50;7d of 15.61±2.13 g L-1, 17.02±0.50 g L-1, and 52.54±4.27 mg L-1 for sodium chloride, potassium chloride, and potassium dichromate, respectively. The acute toxicity response indicated that W. brasiliensis was extremely sensitive to diquat (LC50;7d = 0.07 mg L-1) and paraquat (LC50;7d < 0.05 mg L-1), sensitive to imazapyr (LC50;7d = 21.10 mg L-1), and little sensitive to the other herbicides. The response capacity for the different groups of herbicides, the standardized response to reference substances, and ease of cultivation in the laboratory indicate the potential for using this aquatic plant in the assessment of herbicide risk in aquatic environments. (AU)

FAPESP's process: 15/16735-5 - USE OF HERBICIDE IN SUBMERGED MACROPHYTE CONTROL AND EFFECT ECOTOXICOLOGY FOR ORGANISMS NON-TARGET
Grantee:Claudinei da Cruz
Support Opportunities: Regular Research Grants
FAPESP's process: 15/11189-2 - Ecotoxicology herbicide and compounds for algicides bioindicators: a tool for risk assessment environmental products use of chemical
Grantee:Pâmela Castro Pereira
Support Opportunities: Scholarships in Brazil - Scientific Initiation