Please use this identifier to cite or link to this item: http://repositorio.ufla.br/jspui/handle/1/13248
Title: Ganho genético para produtividade de grãos de soja na região central do Brasil
Other Titles: Soybean genetic gain for yield in central Brazil
Authors: Santos, João Bosco dos
Cunha, Welcimar Gonçalves da
Santos, João Bosco dos
Bruzi, Adriano
Cunha, Welcimar Gonçalves da
Keywords: Soja - Melhoramento genético
Glycine max
Soja - Ganho genético
Soybean - Genetic improvement
Soy - Genetic gain
Issue Date: 20-Jun-2017
Publisher: Universidade Federal de Lavras
Citation: MEZZALIRA, I. Ganho genético para produtividade de grãos de soja na região central do Brasil. 2017. 44 p. Dissertação (Mestrado Profissional em Genética e Melhoramento de Plantas)-Universidade Federal de Lavras, Lavras, 2017.
Abstract: Soybean is one of the main products of the Brazilian agribu siness, with a planted area of about 30 million hectares, which provides a great diversity of environments and highlights the importance of breeding programs in obtaining high yielding varieties that are adapted to different growing environments. The success of a breeding program can be measured by the number of cultivars released, the adoption of these cultivars by the producers, the profit obtained with the marketing of seeds and measur ing the genetic gain obtained by the program over the years. In order to measure the genetic gain for soybean grain yield , from maturation group 8 lines, in the Brazilian soybean macro-regions 3 and 4, results obtained in 204 VCU trials between season 2006/07 and 2015/16, were analyzed. The average yield of soybeans in the analyzed period was 3118 kg ha -1 . The majority of experiments had a coefficient of experimental variation lower than 15% and selective accuracy higher than 0.70, demonstrating high quality and experimental precision. The replacement rate of the genotypes over the analyzed years ranged between 29.41% and 77.78%. The annual genetic gain for soybean genotypes of maturation group 8, between season 2006/07 and 2015/16, in the Brazilian soybean macro-regions 3 and 4, was 18.3 kg ha -1 year -1 or 0.59% in relation to the mean of the experiments analyzed. The components of environmental effect, interaction effect and experimental error were significant and of great magnitude, which makes it difficult to obtain the real genetic values of the evaluated genotypes and makes it difficult to calculate the genetic gain. The varieties and lines considered in this study have higher productive potentials and are the results of enormous contributions of the genetic improvement, a condition in which the gains conferred by the genetic breeding tend to reduce.
URI: http://repositorio.ufla.br/jspui/handle/1/13248
Appears in Collections:Genética e Melhoramento de Plantas - Mestrado Profissional (Dissertações)



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