Physiological Characteristics of Trees Recommended for the Phytoremediation of Soils Contaminated with Herbicides

• Published in: Advances in Weed Science 2018-01, Vol.36
• Main Authors: AGUIAR, L.M., SANTOS, J.B., FERREIRA, E.A., CABRAL, C.M., PEREIRA, I.M., BARROSO, G.M., SANTOS, N.M.C.
• Format: Article
• Language: English
• Subjects: 2,4-D; Agricultural management; Agricultural production; Agrochemicals; Atrazine; Carbon dioxide; Chlorophyll; clomazone; Conductance; Containers; Contamination; Corn; Ecosystems; Efficiency; Environmental management; Environmental quality; Experiments; Herbicides; Immunological tolerance; Intoxication; Photosynthesis; Physiological effects; Physiology; Phytoremediation; PLANT SCIENCES; Resistance; Sediment pollution; Soil contamination; Soil sciences; Soils; Species; Stomata; Stomatal conductance; Sugarcane; Transpiration; Trees; visual intoxication; Water treatment; Water use; Water use efficiency; Weed control
• ISSN: 0100-8358; 1806-9681; 1806-9681; 2675-9462
• DOI: 10.1590/s0100-83582018360100114

Herbicides are inputs with a high volume of use in agricultural production systems for weed management; however, the environmental contamination they cause is a reality. The objective of this research was to evaluate the tolerance of tree species used for the phytoremediation of herbicides in the soil, to atrazine, clomazone and 2,4-D, through the evaluation of photosynthetic indices. Thus, a randomized block design experiment was conducted with four replications, in a 4 x 5 factorial arrangement, where the first factor represented the herbicides atrazine, clomazone and 2,4-D and the control treatment without herbicide (water). The second factor consisted in the use of pre-selected tree species for the phytoremediation of soils with residues of the products [Eremanthus crotonoides DC. (candeia), - Richeria grandis Vahl (richeria), Protium heptaphyllum (Aubl) Marchand, (breu-branco) Kielmeyera latrophyton Saddi, Kew Bull, (pau-santo) Calophyllum brasiliense Cambess (guanandi)]. The herbicides were applied through dishes placed under the culture containers of the plants, when they presented eight months of development. After 15 days from the herbicide application, the visual intoxication, stomatal conductance (Gs), transpiration rate (E), CO2 concentration in the substomatal chamber (Ci), and water use efficiency (WUE) were evaluated. The herbicides affected differently the physiological characteristics of the tree species; atrazine was the most harmful product. Individuals under the effect of 2,4-D and clomazone presented lower variation for their physiological characteristics, compared to the respective control treatments. Breu-branco, despite showing low visual intoxication provided by the herbicides, was the most affected species by the products. On the other hand, candeia was the most tolerant species to the action of the herbicides. RESUMO: Herbicidas são insumos com grande volume de utilização nos sistemas de produção agrícola para o manejo de plantas daninhas; no entanto, a contaminação ambiental causada é uma realidade. Objetivou-se com esta pesquisa avaliar a tolerância de espécies arbóreas fitorremediadoras de herbicidas no solo, aos herbicidas atrazine, clomazone e 2,4-D, através da avaliação de índices fotossintéticos. Dessa forma, um experimento em delineamento de blocos casualizados foi montado com quatro repetições, em esquema fatorial 4 x 5. O primeiro fator representou os herbicidas atrazine, clomazone e 2,4-D e o tratamento controle sem he