Accuracy and genetic progress of agronomic traits in irrigated rice program in Brazil

Reis, Geraldo Gonçalves dos; Fritsche‐Neto, Roberto; Soares, Plínio César; Cornélio, Vanda Maria de Oliveira; Reis, Miria Hespanhol Miranda; Morais, O. P. de; Marques, Thomas

doi:10.5897/ajar2014.9112

Cited by 5 publications

(4 citation statements)

References 11 publications

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“…Soares et al (1999) and Dovale et al (2012) obtained good results (56% and 58%, respectively). Atroch and Nunes (2000) verified an average maintenance rate of 38% in the period from 1997/1998 to 2011/2012 and Reis et al (2015) obtained a mean maintenance rate of 63% in rice. In other crops, such as cotton (Moresco, 2003) and wheat (Carginin et al, 2007), average maintenance rates of 44% and 55%, respectively, were found to be optimal.…”

Section: Resultsmentioning

confidence: 82%

“…This restricts the potential for genotypic variability of elite materials to be explored. An ideal situation would be that replacement rates were equal to or even higher than that observed in the period 1998 to 2012, which was 26% (Reis et al, 2015). In view of these results, new strategies should be used in the breeding program of irrigated rice in Minas Gerais to increase the genetic base of the lines, as well as increase in the rate of replacement and reduction in the rate of maintenance and selection in a specific environment.…”

Section: Resultsmentioning

confidence: 99%

“…The first variety of rice launched by the rice improvement program in Minas Gerais was in fact the IAC 899 variety in 1978 and in the first agricultural year after its launch the productivity obtained in the State was approximately 1300 kg.ha -1 showing the efficiency of the rice improvement program in the State (CONAB, 2016). Reis et al, (2015) evaluated 108 genotypes of flooded rice in the period 1997/1998 to 2011/2012 in the VCU's tests of the Empresa de Pesquisa Agropecuária de Minas Gerais (EPAMIG) of the irrigated rice breeding program. According to these authors there was balance in the irrigated rice improvement of the EPAMIG program regarding the inclusion and exclusion of materials in this study.…”

Section: Resultsmentioning

confidence: 99%

“…There are few studies related to the genotypic substitution rate in cereals; these include wheat (Carginin et al, 2008;Follmann et al, 2017) and rice (Atroch et al, 2000;Reis et al, 2015) studies. To further this line of research, we examined the performance of the irrigated rice breeding program in the state of Minas Gerais, administered by the EPAMIG/UFV/EMBRAPA consortium.…”

Section: Introductionmentioning

confidence: 99%

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Research Article Performance of a breeding program for irrigated rice in Southeast Brazil

Júnior¹,

Carneiro²,

Santos³

et al. 2019

Genet. Mol. Res.

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Estimating the performance of a rice breeding program is possible by means of indexes such as the replacement rate, which quantifies the dynamism of the breeding program and provides the rate of included, excluded, maintained and renewed genotypes year after year. We evaluated the performance of the irrigated rice breeding program in the state of Minas Gerais, conducted by the EPAMIG/UFV/EMBRAPA consortium. A total of 210 lines were evaluated in the municipalities of Janaúba, Leopoldina and Lambari from 1993 to 2016. The average number of genotypes included, maintained and excluded in each year were calculated, along with the replacement rate percentage. The average genotype replacement rate was 44% for Lambari and Janaúba, and 43% for Leopoldina. The average maintenance in Lambari was 39%, and in Janaúba and Leopoldina it was 40%. In all localities, the mean rate of inclusion of genotypes was higher than the average exclusion rate, indicating good efficiency in the irrigated rice breeding program. However, new strategies should be used in the irrigated rice breeding program to increase the genetic basis of lines and increase the replacement rate.

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Section: Resultsmentioning

confidence: 82%

Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Research Article Performance of a breeding program for irrigated rice in Southeast Brazil

Júnior¹,

Carneiro²,

Santos³

et al. 2019

Genet. Mol. Res.

View full text Add to dashboard Cite

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Quarter century genetic progress in irrigated rice (Oryza sativa) in Southeast Brazil

et al. 2021

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Rice is one of the most consumed cereals in the world and of extreme social and economic importance in Brazil. Minas Gerais is the leading State in irrigated rice production in the Southeast Region. This study aimed to estimate the genetic progress of 26 years of the irrigated rice breeding programme of Epamig in Southeast Brazil by time meta‐analysis. Genetic progress was estimated for grain yield, plant height and days to flowering. The dataset understood 162 genotypes in 91 trials of value for cultivation and use of 26 seasons. The rate of annual genetic gain for grain yield was estimated .99% (49.85 kg year−1). It was also verified that was a reduction in plant height and an increase in days to flowering, even if very low. Due to distinct historical phases of the rice breeding programme, there were changes in research focus and, consequently, affected the genetic gains. With this study, it was possible to evaluate the selection strategies carried out in the past and identify important points to maintain.

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Realized Genetic Gain in Rice: Achievements from Breeding Programs

Seck,

Covarrubias-Pazaran,

Gueye

et al. 2023

Rice

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Genetic improvement is crucial for ensuring food security globally. Indeed, plant breeding has contributed significantly to increasing the productivity of major crops, including rice, over the last century. Evaluating the efficiency of breeding strategies necessitates a quantification of this progress. One approach involves assessing the genetic gain achieved through breeding programs based on quantitative traits. This study aims to provide a theoretical understanding of genetic gain, summarize the major results of genetic gain studies in rice breeding, and suggest ways of improving breeding program strategies and future studies on genetic gain. To achieve this, we present the concept of genetic gain and the essential aspects of its estimation. We also provide an extensive literature review of genetic gain studies in rice (Oryza sativa L.) breeding programs to understand the advances made to date. We reviewed 29 studies conducted between 1999 and 2023, covering different regions, traits, periods, and estimation methods. The genetic gain for grain yield, in particular, showed significant variation, ranging from 1.5 to 167.6 kg/ha/year, with a mean value of 36.3 kg/ha/year. This translated into a rate of genetic gain for grain yield ranging from 0.1% to over 3.0%. The impact of multi-trait selection on grain yield was clarified by studies that reported genetic gains for other traits, such as plant height, days to flowering, and grain quality. These findings reveal that while breeding programs have achieved significant gains, further improvements are necessary to meet the growing demand for rice. We also highlight the limitations of these studies, which hinder accurate estimations of genetic gain. In conclusion, we offer suggestions for improving the estimation of genetic gain based on quantitative genetic principles and computer simulations to optimize rice breeding strategies.

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Accuracy and genetic progress of agronomic traits in irrigated rice program in Brazil

Cited by 5 publications

References 11 publications

Research Article Performance of a breeding program for irrigated rice in Southeast Brazil

Research Article Performance of a breeding program for irrigated rice in Southeast Brazil

Quarter century genetic progress in irrigated rice (Oryza sativa) in Southeast Brazil

Realized Genetic Gain in Rice: Achievements from Breeding Programs

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