Ganho genético decorrente da substituição anual de cultivares de milho

Storck, Lindolfo; Bisognin, Dílson Antônio; Filho, Alberto Cargnelutti

doi:10.1590/s0100-204x2005000900007

Cited by 7 publications

(5 citation statements)

References 5 publications

(5 reference statements)

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“…No entanto, em estudo de EMYGDIO et al (2007), alguns híbridos duplos demonstraram potencial produtivo superior a determinados híbridos simples e triplos, indicando não ser apropriado generalizar inferências acerca do potencial produtivo de diferentes híbridos de milho com base no tipo de cruzamento. Resultados semelhantes de produtividade de grãos de milho foram encontrados por STORCK et al (2005) em 12 ensaios realizados no período de 1998 a 2002. Portanto, essas informações conferem credibilidade aos dados do presente estudo.…”

Section: Resultsunclassified

Métodos de estimativa do tamanho ótimo de parcelas experimentais de híbridos de milho simples, triplo e duplo

et al. 2011

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O objetivo deste trabalho foi comparar os métodos de estimativa do tamanho ótimo de parcela e verificar a variabilidade do tamanho ótimo de parcela entre híbridos simples, triplo e duplo de milho. Para isso, foram usados os dados de produtividade de grãos de milho de 16 ensaios de uniformidade com o híbrido simples (P32R21), 16 com o híbrido triplo (DKB566) e 16 com o híbrido duplo (DKB747). Cada ensaio foi composto de quatro linhas de 6m de comprimento, dividido em unidades experimentais básicas de um metro linear. Em cada um dos 48 ensaios foi determinado o tamanho ótimo de parcela por meio dos métodos da curvatura máxima modificada, do modelo linear de resposta com platô e da curvatura máxima do modelo do coeficiente de variação. Foi utilizado o coeficiente de correlação de Spearman para verificar a associação entre os métodos e o teste t para comparar as médias. Há concordância na estimativa do tamanho ótimo de parcelas experimentais de milho simples, triplo e duplo por meio dos métodos da curvatura máxima modificada e da curvatura máxima do modelo do coeficiente de variação. Por esses métodos, o tamanho ótimo de parcela entre os híbridos de milho é de seis unidades experimentais básicas para o híbrido simples e cinco para os híbridos triplo e duplo.

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Section: Resultsunclassified

Métodos de estimativa do tamanho ótimo de parcelas experimentais de híbridos de milho simples, triplo e duplo

et al. 2011

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“…The analysis of the genetic gain using the cultivar substitution methodology was performed according to Vencovsky et al (1988). The significance of the genetic gains for each biennium was tested according to Storck et al (2005). A script in R was developed for this analysis (Supplemental File S2).…”

Section: Methodsmentioning

confidence: 99%

Genetic Gain Over 30 Years of Spring Wheat Breeding in Brazil

et al. 2019

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Wheat (Triticum aestivum L.) is one of the most important crops in the world. Brazil is one of the largest importers of this cereal, and wheat breeding programs are attempting to increase productivity and reduce external dependence. The objectives of this study were to quantify the spring wheat genetic gain in Brazil between 1984 and 2014 using data from multienvironment trials, and to verify if the genetic gain stagnated after the 2000s. This study used a highly unbalanced dataset containing grain yield (GY) data from 187 spring wheat trials that were performed at 25 locations between 2002 and 2015. In total, 126 cultivars, released between 1985 and 2014, were evaluated over 14 crop seasons. The cultivar evaluation indicated that there was a genetic gain in GY of 33.9 kg ha−1 yr−1 (r2 = 0.53, P < 0.01), which represents an increase of 1.28% yr−1. The dataset showed a linear regression for the genetic gain and indicates that wheat genetic gain has not stagnated in Brazil after the 2000s.

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“…The evaluation of genetic gains in Brazilian breeding programs is available for soybean [ Glycine max (L.) Merr.] (Lange and Federizzi, 2009), common beans ( Phaseolus vulgaris L.) (de Faria et al, 2013), rice ( Oryza sativa L.) (Atroch and Nunes, 2000; Breseghello et al, 2011), and maize ( Zea mays L.) (Storck et al, 2005). However, similar studies regarding wheat are scarce.…”

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Wheat Yield Improvements in Brazil: Roles of Genetics and Environment

et al. 2018

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Several studies have shown a significant increase in wheat (Triticum aestivum L.) grain yield (GY) worldwide during the 20th century as a result of genetic and environmental improvement. The objective of this study was to measure the genetic gains achieved in a wheat breeding program maintained by the Central Cooperative of Agricultural Research (COODETEC) in Brazil through the annual evaluation of lines in multienvironment trials. The dataset was composed of 836 advanced trials and was evaluated in 40 representative locations to assess the value for cultivation and use (VCU) regions in the south, southeast, and central‐west areas of the country from 2004 to 2013. Each trial consisted of 25 treatments (lines + checks) in a randomized complete block design with three replicates. A linear mixed model was fitted to predict the genetic values of each genotype per year and a restricted maximum likelihood algorithm to estimate the variance components. These genetic values were used to compute the genetic gain over the years. The overall estimated genetic gain of the breeding program was 61.59 kg ha−1 yr−1 (1.68% yr−1) for GY, although it was partially counterbalanced by the estimated negative environmental effects. The genetic gain per VCU region ranged from 31.38 (VCU 4) to 115.33 kg ha−1 yr−1 (VCU 1). After accounting for the environmental changes over years, the yield gain was 39.40 kg ha−1 yr−1 (1.10% yr−1), ranging from −0.82 (VCU 3) to 3.35% yr−1 (VCU 1). The assessment of Brazilian cultivars released between 1998 and 2014 showed genetic gains in GY of 34.8 kg ha−1 yr−1 (1% yr−1), demonstrating that the efforts of Brazilian research institutions to develop cultivars have produced additive results. The implications of genetic gain estimates on breeding programs are discussed.

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Ganho genético decorrente da substituição anual de cultivares de milho

Cited by 7 publications

References 5 publications

Métodos de estimativa do tamanho ótimo de parcelas experimentais de híbridos de milho simples, triplo e duplo

Métodos de estimativa do tamanho ótimo de parcelas experimentais de híbridos de milho simples, triplo e duplo

Genetic Gain Over 30 Years of Spring Wheat Breeding in Brazil

Wheat Yield Improvements in Brazil: Roles of Genetics and Environment

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