Recurrent Selection with Low Herbicide Rates and Salt Stress Decrease Sensitivity of Echinochloa colona to Imidazolinone

Authors

Lariza Benedetti, Federal University of PelotasFollow
Vivian Ebeling Viana, Federal University of PelotasFollow
Pamela Carvalho-Moore, University of Arkansas, FayettevilleFollow
Vinicios Rafael Gehrke, Federal University of PelotasFollow
Gustavo Maia Souza, Federal University of PelotasFollow
Edinalvo Rabaioli Camargo, Federal University of PelotasFollow
Luis Antonio de Avila, Federal University of PelotasFollow
Nilda Roma-Burgos, University of Arkansas, FayettevilleFollow

Document Type

Article

Publication Date

3-2021

Keywords

adaptation; junglerice; low herbicide dose selection; reduced susceptibility; salinity

Abstract

Weeds represent an increasing challenge for crop systems since they have evolved adaptability to adverse environmental conditions, such as salinity stress. Herbicide effectiveness can be altered by the quality of water in which the weed is growing. This research aimed to study the combined effect of salt stress and recurrent selection with a sublethal dose of imidazolinone herbicides in the shifting of the sensitivity of Echinochloa colona (L.) Link (junglerice) to imidazolinone herbicides. This study was divided into two experiments; in experiment I, three recurrent selection cycles were conducted in Pelotas/RS/Brazil with imazapic + imazapyr at 0.125× the field rate; and in experiment II, three recurrent selection cycles were conducted in Fayetteville/AR/USA with imazethapyr, at 0.125× the recommended dose. Salt stress was implemented by irrigation with 120 mM sodium chloride (NaCl) solution. The effective dose for 50% control of the population (ED₅₀) values increased from the field population to the second generation (G2) after recurrent selection with a sublethal dose of imidazolinone combined with salt stress, supporting the hypothesis of reduced susceptibility by the combination of these abiotic factors. Recurrent exposure to a sublethal dose of imazapic + imazapyr or imazethapyr, combined with salt stress, reduced susceptibility of Echinochloa colona (L.) plants to imidazolinone herbicides.

Citation

Benedetti, L., Viana, V. E., Carvalho-Moore, P., Gehrke, V. R., Souza, G. M., Camargo, E. R., de Avila, L. A., & Roma-Burgos, N. (2021). Recurrent Selection with Low Herbicide Rates and Salt Stress Decrease Sensitivity of Echinochloa colona to Imidazolinone. Agriculture, 11 (3), 187. https://doi.org/10.3390/agriculture11030187

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