Abstract
required. Maize with cp4-epsps and pat genes is tolerant to glyphosate and glufosinate-ammonium herbicides and has been a tool used for weed control. However, there is a demand for new studies to assess how tolerant it is and to avoid yield losses. The objective of this study was to assess the selectivity of the 2B810PW hybrid, which has the cp4-epsps and pat genes, subjected to applications of glyphosate (gly) and glufosinate-ammonium (glu), both isolated and combined, at two different rates, during three crop years, in two municipalities in Paraná state. A randomized block design, with four replications, was used. Some measured variables, such as plant height, showed few differences between crop years and locations, while others, like percentage of seed germination and yield, showed no differences (P ≤ 0.05). This demonstrates that the hybrid is resistant to the application of glufosinate-ammonium and glyphosate herbicides, isolated or combined, and these molecules can provide more options for weed control in crops of maize containing the cp4-epsps and pat genes.
Highlights
GLYPHOSATE E AMÔNIO GLUFOSINATO SÃO TOTALMENTE SELETIVOS PARA MILHO TRANSGÊNICO CONTENDO OS GENES CP4-EPSPS E phosphinothricin acetyltransferase (PAT)?
The pat gene is responsible for the phosphinothricin acetyltransferase (PAT) enzyme, produced by the Streptomyces viridochromogenes bacterium, which transforms the glufosinate into n-acetyl-glufosinate, a compound that is not toxic to the plants (Herouet et al, 2005)
The results indicate that there were no differences in the variables relating to ear insertion height and plant height for the assessed hybrid (Table 2)
Summary
GLYPHOSATE E AMÔNIO GLUFOSINATO SÃO TOTALMENTE SELETIVOS PARA MILHO TRANSGÊNICO CONTENDO OS GENES CP4-EPSPS E PAT?. O milho com os genes cp4-epsps e pat é tolerante aos herbicidas glyphosate e amônio glufosinato e tem sido uma ferramenta usada para o controle de plantas daninhas, porém há uma demanda por novos estudos a este respeito, avaliando a sua resistência e evitandose perdas de rendimento. Isso demonstra que o híbrido é resistente à aplicação dos herbicidas amônio glufosinato e glyphosate, isolados ou em mistura, e essas moléculas podem fornecer mais opções de controle de plantas daninhas na cultura do milho contendo os genes cp4-epsps e pat. One of the existing technologies is Roundup Ready 2® (RR2), which provides tolerance to glyphosate and was approved for use in some crops in Brazil in 2008 (CIB, 2017b) This is possible due to the presence of the cp4-epsps enzyme, which is insensitive to glyphosate, obtained from Agrobacterium sp (Dill, 2005). Glyphosate mixed with glufosinate is a practice that has been employed in weed control due to the possibility of using it in postemergence of transgenic maize, either in tank mixture or in sequential applications
Sign-in/Register to view highlights & summary Sign-in/Register to access full text options 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a call
