CHLORIMURON-ETHYL IN CONVENTIONAL AND TRANSGENIC SOYBEAN CULTIVARS UNDER WATER DEFICIT STRESS

Authors

  • Clebson Gomes Gonçalves Department of Crop, Soil and Environmental Sciences, Auburn University, Auburn, AL http://orcid.org/0000-0001-8595-1646
  • Antonio Carlos da Silva Junior Department of Crop Production, Universidade Estadual Paulista “Júlio de Mesquita Filho”, Jaboticabal, SP http://orcid.org/0000-0002-9931-7686
  • Maynumi Scarano Department of Crop Production, Universidade Estadual Paulista “Júlio de Mesquita Filho”, Jaboticabal, SP http://orcid.org/0000-0001-6070-2707
  • Maria Renata Rocha Pereira Faculdade de Tecnologia de Capão Bonito, Capão Bonito, SP http://orcid.org/0000-0001-8023-2562
  • Dagoberto Martins Department of Crop Production, Universidade Estadual Paulista “Júlio de Mesquita Filho”, Jaboticabal, SP http://orcid.org/0000-0002-2346-9667

DOI:

https://doi.org/10.1590/1983-21252018v31n405rc

Keywords:

Irrigation. ALS Inhibiting herbicide. Phytotoxicity. Glycine max. Selectivity.

Abstract

Water deficit is a limiting factor for the soybean yield; it triggers different physiological and anatomical adaptations that have deleterious effects on the plants and can affect the selectivity of herbicides, causing production losses. In this context, the objective of this work was to evaluate the action of the chlorimuron-ethyl herbicide when applied at different stages of soybean plants, using conventional and transgenic cultivars, and different soil water potentials. A rate of 20 g ha-1 of the chlorimuron-ethyl herbicide was applied to two soybean cultivars (MG/BR46-Conquista – conventional, and BRS-Valiosa-RR – transgenic) at two phenological stages (V2 – first fully expanded trifoliate leaves, and V4 – third fully expanded trifoliate leaves), using three soil water potentials (-0.03 MPa, -0.07 MPa, and -0.5 MPa). Phytotoxicity, and plant height were evaluated at 3, 7, 14, and 21 days after the herbicide application. The shoot dry weight, root dry weight, and root system nodulation were evaluated. The soybean plants had lower phytotoxicity when subjected to application of chlorimuron-ethyl under water deficit conditions. The use of chlorimuron-ethyl reduced the growth and biomass of soybean plants and affected the plants' root system nodulation. The transgenic cultivar (BRS-Valiosa-RR) presented better performance when subjected to a moderate water deficit (-0.07 MPa), which contributes to biological nitrogen fixation.

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Published

16-10-2018

Issue

Section

Agronomy