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

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Data

2018-10-01

Autores

Goncalves, Clebson Gomes
Silva Junior, Antonio Carlos da [UNESP]
Scarano, Maynumi [UNESP]
Rocha Pereira, Maria Renata
Martins, Dagoberto [UNESP]

Título da Revista

ISSN da Revista

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Editor

Univ Fed Rural Semi-arido-ufersa

Resumo

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.

Descrição

Palavras-chave

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

Como citar

Revista Caatinga. Mossoro: Univ Fed Rural Semi-arido-ufersa, v. 31, n. 4, p. 832-842, 2018.