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

Lariza Benedetti, Vívian Ebeling Viana, Pâmela Carvalho-Moore, Vinicios Rafael Gehrke, Gustavo Maia Souza, Edinalvo Rabaioli Camargo, Luis Antonio de Avila and Nilda Roma-Burgos
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Lariza Benedetti: Department of Crop Protection, Federal University of Pelotas, Pelotas 96160-000, RS, Brazil
Vívian Ebeling Viana: Department of Crop Protection, Federal University of Pelotas, Pelotas 96160-000, RS, Brazil
Pâmela Carvalho-Moore: Department of Crop, Soil and Environmental Sciences, University of Arkansas, Fayetteville, AR 72704, USA
Vinicios Rafael Gehrke: Department of Crop Protection, Federal University of Pelotas, Pelotas 96160-000, RS, Brazil
Gustavo Maia Souza: Department of Botany, Federal University of Pelotas, Pelotas 96160-000, RS, Brazil
Edinalvo Rabaioli Camargo: Department of Crop Protection, Federal University of Pelotas, Pelotas 96160-000, RS, Brazil
Luis Antonio de Avila: Department of Crop Protection, Federal University of Pelotas, Pelotas 96160-000, RS, Brazil
Nilda Roma-Burgos: Department of Crop, Soil and Environmental Sciences, University of Arkansas, Fayetteville, AR 72704, USA

Agriculture, 2021, vol. 11, issue 3, 1-12

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 (ED 50 ) 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.

Keywords: adaptation; junglerice; low herbicide dose selection; reduced susceptibility; salinity (search for similar items in EconPapers)
JEL-codes: Q1 Q10 Q11 Q12 Q13 Q14 Q15 Q16 Q17 Q18 (search for similar items in EconPapers)
Date: 2021
References: View references in EconPapers View complete reference list from CitEc
Citations: View citations in EconPapers (1)

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