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vol.31 número4ESTIMULANTE DE MICORRIZAÇÃO EM SOJA ASSOCIADO À ADUBAÇÃO FOSFATADA EM LATOSSOLOSCONDICIONAMENTO FISIOLÓGICO COM DIFERENTES FONTES E CONCENTRAÇÕES DE GLICÍDIOS EM SEMENTES DE BRAQUIÁRIA índice de autoresíndice de assuntospesquisa de artigos
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Revista Caatinga

versão impressa ISSN 0100-316Xversão On-line ISSN 1983-2125

Resumo

GONCALVES, Clebson Gomes et al. CHLORIMURON-ETHYL IN CONVENTIONAL AND TRANSGENIC SOYBEAN CULTIVARS UNDER WATER DEFICIT STRESS. Rev. Caatinga [online]. 2018, vol.31, n.4, pp.832-842. ISSN 0100-316X.  https://doi.org/10.1590/1983-21252018v31n405rc.

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.

Palavras-chave : Irrigation; ALS Inhibiting herbicide; Phytotoxicity; Glycine max; Selectivity..

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