Ammonium Glufosinate Associated with Post-Emergence Herbicides in Corn with the cp4-epsps and Pat Genes

Abstract

With the possibility of using ammonium glufosinate in corn, studies on its association with other herbicides are essential. The aim of this study was to assess weed control and herbicide selectivity in association with ammonium glufosinate in corn containing the pat and cp4-epsps genes. The experiment was carried out under field conditions in two sites in a randomized block design with four replications. Treatments consisted of ammonium glufosinate, glyphosate, ammonium glufosinate + glyphosate, ammonium glufosinate + nicosulfuron, ammonium glufosinate + atrazine, ammonium glufosinate + tembotrione, ammonium glufosinate + mesotrione, ammonium glufosinate + carfentrazone ethyl, ammonium glufosinate + bentazon, ammonium glufosinate + 2,4-D, control without weeding, and hand-weeded control. Visual assessments were performed regarding damage, electron transport rate in photosystem II (ETR), ammonia quantification, height, and grain yield of corn plants, as well as weed control at both sites. The application of ammonium glufosinate and its associations did not provide a reduction in productivity when compared to the hand-weeded control. Some treatments presented higher levels of visual damage and ammonia accumulation, but without a yield reduction. Therefore, herbicide mixture with ammonium glufosinate may be an alternative to weed control without damaging corn crop, which presents in its genetic constitution the cp4-epsps and pat genes. Planta Daninha 2019; v37:e019184453 KRENCHINSKI, F.H. et al. Ammonium glufosinate associated with post-emergence herbicides in corn with the cp4-epsps and pat ...2 visual e acúmulo de amônia, porém sem redução de produtividade. Portanto, a mistura de herbicidas com o amônio-glufosinate pode ser uma alternativa para o controle de plantas daninhas, sem causar danos à cultura do milho, que apresenta na sua constituição genética os genes cp4-epsps e pat.Palavras-chave: acúmulo de amônia, fosfinotricina, fluxo de transporte de elétrons, resistência a herbicidas, Zea mays.

Metabolic changes, agronomic performance, and quality of seeds in soybean with the pat gene after application of glufosinate

“…Studies have shown that internal ammonia concentration is related to intoxication of plants by glufosinate (Brito et al 2017;Carbonari et al 2016;Krenchinski et al 2019;Sellers et al 2004;Tsai et al 2006). Thus, the accumulation of ammonia after application of glufosinate can be used as a biochemical marker of GS inhibition and, consequently, as an indicator of the action of the herbicide (Petersen and Hurle 2001) and the level of sensitivity of the plants.…”

Growth, development, and chlorophyll indexes of glyphosate and glufosinate-tolerant maize under herbicide application

“…In the relevant literature, there are no reports of glyphosate damage in RR2 maize and, when reported, usually, they have higher rates than the one that was considered in this study (Gemelli et al, 2013;Albrecht et al, 2014;Langdon et al, 2020). The same fact occurs with glufosinate, alone or in mixtures, in which no harmful effects were observed in LL maize (Silva et al, 2017;Krenchinski et al, 2019).…”

Eficácia de herbicidas no controle Spermacoce verticillata e seletividade para as plantas de milho

“…ha -1 ) não foi seletiva para o milho (Petter et al, 2011). A injúria causada pelo carfentrazona pode ser maior quando em associação com outros herbicidas, Krenchinski et al (2019) observaram injúria de mais de 20% nas plantas de milho, para a aplicação de carfentrazona (30 g i.a. ha -1 ) + glufosinato (500 g i.a.…”