Estimates of genetic parameters in common bean genotypes

Correa, Agenor Martinho; Gonçalves, Manoel Carlos; Destro, Deonisio; Ferreira, Luiz Carlos; Sobrinho, Teodorico Alves

doi:10.12702/1984-7033.v03n03a07

Cited by 9 publications

(17 citation statements)

References 2 publications

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“…A estimativa de 31,49% para o caráter PROD é considerada alta (Correa et al, 2003) e indica que entre todos os caracteres estudados ele é o que mostra maior variabilidade, sendo altamente promissor para a realização da seleção. Ubi et al (2007) encontraram para os caracteres "massa de 100 grãos" e "comprimento de vagem" coeficientes de variação genética de 9,2 e 25,9%, respectivamente, sendo o primeiro menor e o segundo maior do que as estimativas obtidas neste trabalho.…”

Section: Resultsunclassified

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Estimativas de parâmetros genéticos e correlações entre caracteres fenológicos e morfoagronômicos em feijão-caupi

et al. 2012

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Estimates of genetic parameters and correlations between phenological and morphological traits in cowpeaDetermining the genetic variability and correlations between traits of interest for selection in a population is one of the stages in a breeding program. The objectives of this study was to evaluate the potential for genetic improvement of a population composed of 19 cowpea genotypes of erect and semi-erect growth habits, involving commercial varieties and advanced lines. Genetic and phenotypic parameters and correlations between phenological and morphological traits of the population were estimated. The trial was carried out at the experimental field at the Universidade Estadual de Mato Grosso do Sul, in Aquidauana, in the dry season of the crop year 2007/2008. The following traits were evaluated: days to flowering (DF), days to maturity (DM), mass of 100 beans (MHB), length of pod (LP), mass of pods (MP), number of seeds per pod (NS) and dry bean yield (DBY). There was a significant effect Mensurar a variabilidade genética e conhecer as correlações entre caracteres de interesse para seleção numa população constitui uma das etapas iniciais em um programa de melhoramento genético. Com o objetivo de avaliar o potencial para o melhoramento genético de uma população composta por 19 genótipos de feijão-caupi de porte ereto e semiereto, entre variedades comerciais e linhagens avançadas, foram estimados parâmetros genéticos e fenotípicos e correlações entre caracteres fenológicos e morfoagronômicos da população. O experimento foi conduzido na área experimental da Universidade Estadual de Mato Grosso do Sul, em Aquidauana, no período da seca do ano agrícola 2007/2008. Foram avaliados os caracteres: dias para o florescimento (DF), dias para a maturação (DM), massa de 100 grãos (MCG), comprimento de vagem (CV), massa de vagem (MV), número de grãos por vagem (NGV) e produtividade de grãos secos (PROD). Verificou-se efeito significativo de genótipos para todas as características indicando existên-cia de variabilidade. O maior valor da estimativa do coeficiente de variação genética foi obtido para PROD, que também apresentou o mais alto valor de coeficiente b, 2,05, indicando condição favorável para seleção desse caráter. Dentre os demais caracteres apenas para DM o valor do coeficiente b foi superior a um. Foram observadas correlações genéticas positivas e significativas entre todos os caracteres e PROD, sendo as mais elevadas com DF, MV e NGV. Concluiu-se que a população apresentou potencial para o melhoramento genético e que aumento da produtividade de grãos pode ser obtido principalmente para genótipos mais tardios. Palavras-chave:Vigna unguiculata (L.) Walp, parâmetros fenotípicos, variabilidade genética. 89Estimativas de parâmetros genéticos e correlações entre caracteres fenológicos e...Rev. Ceres, Viçosa, v. 59, n.1, p. 88-94, jan/fev, 2012

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Section: Resultsunclassified

“…As estimativas obtidas são usadas pelo melhorista para definir as melhores estratégias de seleção para a obtenção de genótipos superiores (Correa et al, 2003).…”

Section: Introductionunclassified

Estimativas de parâmetros genéticos e correlações entre caracteres fenológicos e morfoagronômicos em feijão-caupi

et al. 2012

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“…The result of this research for these traits is in agreement with the observations of other researchers (Chand, 1999;Rafi and Nath, 2004). Correa et al (2003Correa et al ( , 2015 also reported low GCV for days to 50% flowering, days to maturity, number of seeds pod -1 and high for seed yield in common bean experiments. Similarly, low PCV and low GCV for days to flowering and days to maturity, high PCV and GCV for seed yield, hundred seed weight and seeds plant -1 were reported by Rafi and Nath (2004).…”

Section: Discussionmentioning

confidence: 96%

Genetic diversity in speckled bean (Phaseolus vulgaris L.) genotypes in Ethiopia

Gelaw¹

2017

J. Plant Breed. Crop Sci.

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In the present investigation, the genetic variability of 64 speckled type common bean genotypes were evaluated at Haramaya University during 2015 cropping season using 8 × 8 simple lattice design with three replications. The analysis of variance indicated highly significant (P<0.01) differences among genotypes for all the nine characters studied. High genotypic coefficient of variation (GCV) was observed for grain yield, while high phenotypic coefficients of variation (PCV) were recorded for number of seeds plant -1 , grain yield ha -1 and common bacterial blight resistance. For all the traits, estimates of PCV were higher than GCV indicating the presence of environmental influence. High heritability values and genetic advances were recorded in grain yield. Cluster analysis using Mahalanobis distance delineated the genotypes into six main groups. Cluster I contain the largest number of genotypes (43.75%) followed by clusters II (26.56%) and III (10.94%) while clusters IV, V and VI contain four genotypes each. The D 2 analysis indicated that there was a significant difference among the clusters. The maximum inter cluster distance was observed between cluster IV and V. Principal component analysis (PCA) was performed to assess the variation and correlation among genotypes for the traits and grouped them based on their performance. The combination of the first four principal components explained more than 85.74% of the genotypic variations. Therefore, exploiting the genetic diversity among clusters would broaden the genetic base of speckled bean breeding populations.

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“…This parameter allows to make inference about the genetic variability in the different traits, as well as the genotypic coefficient of determination (R 2 ). Higher estimates of CVg above 20% (Correa et al, 2003) are indicative that the population is promising for the selection of the trait under study, and significant selection gains should be expected. For the traits studied, only YIE presented an estimate above 20%.…”

Section: Resultsmentioning

confidence: 99%

“…Thus, it is important for the breeder to know the degree of association between traits of agronomic importance, mainly because the selection on one trait changes the behavior of others (Correa et al, 2003). Genotypic, phenotypic, and environmental correlations were shown in Table 5.…”

Section: Resultsmentioning

confidence: 99%

Genetic parameters and path analysis in cowpea genotypes grown in the Cerrado/Pantanal ecotone

Lopes¹,

Teodoro²,

Silva³

et al. 2017

Genet. Mol. Res.

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ABSTRACT. Estimating genetic parameters in plant breeding allows us to know the population potential for selecting and designing strategies that can maximize the achievement of superior genotypes. The objective of this study was to evaluate the genetic potential of a population of 20 cowpea genotypes by estimating genetic parameters and path analysis among the traits to guide the selection strategies. The trial was conducted in randomized block design with four replications. Its morphophysiological components, components of green grain production and dry grain yield were estimated from genetic use and correlations between the traits. Phenotypic correlations were deployed through path analysis into direct and indirect effects of morphophysiological traits and yield components on dry grain yield. There were significant differences (P < 0.01) between the genotypes 2 K.V. Lopes et al. Genetics and Molecular Research 16 (2): gmr16029559 for most the traits, indicating the presence of genetic variability in the population and the possibility of practicing selection. The population presents the potential for future genetic breeding studies and is highly promising for the selection of traits dry grain yield, the number of grains per pod, and hundred grains mass. A number of grains per green pod is the main determinant trait of dry grain yield that is also influenced by the cultivar cycle and that the selection for the dry grain yield can be made indirectly by selecting the green pod mass and green pod length.

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Estimates of genetic parameters in common bean genotypes

Cited by 9 publications

References 2 publications

Estimativas de parâmetros genéticos e correlações entre caracteres fenológicos e morfoagronômicos em feijão-caupi

Estimativas de parâmetros genéticos e correlações entre caracteres fenológicos e morfoagronômicos em feijão-caupi

Genetic diversity in speckled bean (Phaseolus vulgaris L.) genotypes in Ethiopia

Genetic parameters and path analysis in cowpea genotypes grown in the Cerrado/Pantanal ecotone

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