Glyphosate effects on tree species natives from Cerrado and Caatinga Brazilian biome: Assessing sensitivity to two ways of contamination.

Autor: Borges MPDS; Universidade Federal Rural do Semi-Árido, Agricultural Science Center, Av. Francisco Mota, 572, Costa e Silva, CEP 59625-900 Mossoró, RN, Brazil. Electronic address: talianeteofilo23@gmail.com., Silva DV; Universidade Federal Rural do Semi-Árido, Agricultural Science Center, Av. Francisco Mota, 572, Costa e Silva, CEP 59625-900 Mossoró, RN, Brazil., Souza MF; Universidade Federal Rural do Semi-Árido, Agricultural Science Center, Av. Francisco Mota, 572, Costa e Silva, CEP 59625-900 Mossoró, RN, Brazil., Silva TS; Universidade Federal Rural do Semi-Árido, Agricultural Science Center, Av. Francisco Mota, 572, Costa e Silva, CEP 59625-900 Mossoró, RN, Brazil., Teófilo TMDS; Universidade Federal Rural do Semi-Árido, Agricultural Science Center, Av. Francisco Mota, 572, Costa e Silva, CEP 59625-900 Mossoró, RN, Brazil., da Silva CC; Universidade Federal Rural do Semi-Árido, Agricultural Science Center, Av. Francisco Mota, 572, Costa e Silva, CEP 59625-900 Mossoró, RN, Brazil., Pavão QS; Universidade Federal Rural do Semi-Árido, Agricultural Science Center, Av. Francisco Mota, 572, Costa e Silva, CEP 59625-900 Mossoró, RN, Brazil., Passos ABRJ; Universidade Federal Rural do Semi-Árido, Agricultural Science Center, Av. Francisco Mota, 572, Costa e Silva, CEP 59625-900 Mossoró, RN, Brazil., Dos Santos JB; Universidade Federal dos Vales do Jequitinhonha e Mucuri - Campus JK, Agricultural Science Center, Rodovia MGT 367, Km 583, n° 5000, Alto da Jacuba, CEP: 39100-000 Diamantina, MG, Brazil.
Jazyk: angličtina
Zdroj: The Science of the total environment [Sci Total Environ] 2021 May 15; Vol. 769, pp. 144113. Date of Electronic Publication: 2021 Jan 09.
DOI: 10.1016/j.scitotenv.2020.144113
Abstrakt: Glyphosate is applied for dissection in no-till and post-emergence management in transgenic crops in agricultural fields near the Cerrado and Caatinga biomes. These biomes together represent 33.8% of the Brazilian territory, contributing to the maintenance of great world diversity in flora and fauna. Despite actions to protect them, the proximity with agricultural areas and intense use of glyphosate puts at risk the preservation of native vegetation due to the contamination via herbicide transport processes. Our objectives were: i) to determine the sensitivity of native species from the Cerrado and Caatinga to glyphosate contamination via drift and groundwater; ii) evaluate the level of sensitivity to glyphosate among the different organs of plants. The highest intoxications (upper 80%) were observed for Bauhinia cheilantha, Mimosa caesalpiniaefolia, Mimosa tenuiflora and Amburana cearensis due to drift simullation. The species with 90% of total dry matter reduction were Bauhinia cheilantha, Enterolobium contortisiliquum, Mimosa caesalpiniaefolia, Mimosa tenuiflora, Tabebuia aurea. B. cheilantha and M. tenuiflora are most affected by exposure to glyphosate drift, with 50% of total dry matter reduction when exposed to doses below 444,0 g ha -1 . Leaf growth is more sensitive to glyphosate for drift exposure for most species. Hymenaea courbaril is an exception, with greater sensitivity to root growth (50% dry matter reduction at doses below 666,0 g ha -1 ). B. cheilantha is the species most sensitive to drift exposure; however, it showed complete tolerance to contamination in subsurface waters. Other species such as Anadenanthera macrocarpa and M. caesalpiniifolia are also sensitive to drift, but without reach 90% of total dry matter reduction. A. macrocarpa, M. caesalpiniifolia and T. aurea were tolerant to contamination by subsurface water. The differential tolerance of trees confirms glyphosate's potential as a species selection agent in the Cerrado and Caatinga biomes.
Competing Interests: Declaration of competing interest The authors declare that they have no known competing financial interests or personal relationships that could have appeared to influence the work reported in this paper.
(Copyright © 2020 Elsevier B.V. All rights reserved.)
Databáze: MEDLINE
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