Abstract
Transgene insert location in the genome through different methods is random. Thus, alterations in the expression of desired trait may occur, as well as alterations in the expression of other characteristics of receptor plant. The purpose of this study was to compare Bt transgenic maize hybrids and the respective conventional isogenic hybrid in relation to adaptability and phenotypic stability. Field trails were set up in four locations of Minas Gerais, Brazil (Campo do Meio, Lavras, Madre de Deus and Paragua?u). A randomized complete block design was used, with three replications, and the treatment structure was a factorial 6 × 2, with six hybrids in the transgenic and conventional versions. Plant and ear height and grain yield were evaluated. To estimate stability, the Anicchiarico, Wricke and AMMI methodologies were used. Grain yield and ear height of the transgenic hybrids and their respective conventional isogenic hybrid did not differ. There are differences in the phenotypic stability between transgenic hybrids with Bt technology and their counterpart conventional isogenic hybrid.
Highlights
In 2014, biotechnological crops occupied 42.2 million hectares in Brazil [1], with the area planted to transgenic
Rapid adoption of this technology by Brazilian producers has been observed in consideration of the fact that the first varieties of genetically modified maize were released for planting in 2008
The experiments were conducted in the summer 2009/2010 crop season in a no-till system in four locations in the southern region of Minas Gerais, Brazil: Campo do Meio (850 m altitude, 21 ̊05'S and 45 ̊34'W), Lavras (988 m, 21 ̊14'S and 45 ̊00'W), Madre de Deus (1018 m, 21 ̊31'S and 42 ̊20'W) and Paraguaçu (720 m, 21 ̊45'S and 45 ̊15'W)
Summary
Rapid adoption of this technology by Brazilian producers has been observed in consideration of the fact that the first varieties of genetically modified maize were released for planting in 2008. Bt maize cultivars are obtained through insertion of a determined gene of the Bacillus thuringiensis bacteria by biolistic device or by Agrobacterium tumefaciens in the genome of this species [2]. In these two plant transformation systems, the location of insertion of the desired gene in the plant genome is at random. Morphological alterations in various crops are described in the literature, such as rice [6], soybeans [7], cotton [8] and maize [9]
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