Estimativa de parâmetros genéticos sob duas estratégias de avaliação em híbridos intra e interespecíficos de capim-elefante

Assis, Liz Carolina da Silva Lagos Cortes; Lira, Mário de Andrade; Santos, Mércia Virgínia Ferreira dos; Júnior, José Carlos Batista Dubeux; Cunha, Márcio Vieira da

doi:10.1590/s1516-35982010001200005

Cited by 3 publications

(4 citation statements)

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“…Ceres, Viçosa, v. 64, n.1, p. 060-067, jan/fev, 2017 heritabilities for TDM and LDM similar to this study. Similar results were also reported for elephantgrass (Assis et al, 2010) and Brachiaria brizantha (Basso et al, 2009). Nonetheless, Daher et al (2004) found high heritability for the leaf:culm ratio and lower for total dry matter production.…”

Section: Resultssupporting

confidence: 84%

“…However, the reduced contribution of the genetic variance to HI and TIN reinforces the difficulty of genetic gain in the recovery of superior plants. High heritabilities enhance the gains with the selection, by determining the amount of the phenotype that has the participation of the genetic and environmental effects, which is essential for the definition of the best experimental arrangement and the selection pressure to be defined in the research condition (Assis et al, 2010). It is worth noting that heritability directly participates in the prediction of genetic gain regardless of the selection method and, consequently, in the decision-making of the breeding process (Ramalho et al, 2012).…”

Section: Resultsmentioning

confidence: 99%

“…The indirect selection would be more effective when the correlation between the two traits was high and positive and the heritability of the secondary trait was greater than that of the main trait of interest (DePauw et al, 2007). Assis et al (2010) affirmed that selection is more effective when it is on high-heritability traits that have direct association with the trait of greater importance. An indirect trait with high heritability may provide genetic progress faster than the direct selection on a main trait, especially when the main trait shows low heritability and is difficult to measure (Carvalho et al, 2001).…”

Section: Trait Meanmentioning

confidence: 96%

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Genetic gain in apomictic species of the genus Paspalum

et al. 2017

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1The objective of this work was to provide means to obtain genetic gain in apomictic species of the genus Paspalum by identifying traits that simultaneously show high correlation and heritability. Thus, to determine the amount of phenotypic variation due to genetic and environmental effects and the degree of association between leaf dry matter production and other traits of forage interest that are easy to select and measure will bring agility and economy in the selection of forage species. The experiment was conducted in the years 2009/10 and 2010/11 in the municipalities of Eldorado do Sul and Augusto Pestana, RS, Brazil, in a randomized complete block design with three replicates. The increase in the direct selection pressure on total and leaf dry matter of apomictic accesses of the genus Paspalum is enhanced by a greater contribution of genetic effects than environmental effects on the composition of the phenotypic variance. Efficient genetic gain in leaf production is achieved by indirect selection of total dry matter, which is a trait of high heritability and easy to select and measure.

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Section: Resultssupporting

confidence: 84%

Section: Resultsmentioning

confidence: 99%

Section: Trait Meanmentioning

confidence: 96%

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Genetic gain in apomictic species of the genus Paspalum

et al. 2017

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“…Desta forma, verifica-se que a maioria das características de qualidade de biomassa avaliada apresentou coeficiente de variação considerado baixos (Pimentel-Gomes, 2009). Esse resultado indica que há maior participação da variação genética na variação fenotípica (Assis et al, 2010). Essa maior participação da variação genética na variação fenotípica é favorável durante o processo de seleção dos melhores genótipos, pois se estará selecionando com base na proporção herdável da variância fenotípica.…”

Section: Resultsunclassified

Qualidade da biomassa em híbridos de capim-elefante para fins energéticos

Sousa

Daher

Menezes

et al. 2016

Agraria

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RESUMOAlém do uso como forrageira, o capim-elefante vem sendo utilizado como fonte de energia alternativa. Isso se deve pela sua alta capacidade de produção de biomassa. É desejável que essa biomassa tenha alto teor de fibras e baixo de cinzas, por isso há necessidade de se obter materiais genéticos com essas características. Com isso, o objetivo deste trabalho foi avaliar as características químicas dos híbridos de capim-elefante e dos seus genitores para produção de biomassa energética. O experimento foi conduzido na Empresa de Pesquisa Agropecuária do Estado do Rio de Janeiro, localizada em Campos dos Goytacazes, nos anos de 2011 e 2012. Foram efetuados dois cortes onde foram avaliadas: Porcentagem de cinzas (%CIN); fibra de detergente neutro (%FDN) e ácido (%FDA); celulose (%CEL); hemicelulose (%HEM); e lignina (%LIG). O delineamento foi em blocos ao acaso, com três repetições. Os tratamentos foram quatro genitores femininos, quatro genitores masculinos, 16 híbridos obtidos em esquema de cruzamento em dialelo parcial e uma testemunha. As médias foram comparadas pelo teste de Tukey (P < 0,05). Em relação às características avaliadas no presente estudo, as combinações híbridas H1, H3, H5, H7, H9 e os genitores P4 e P6 possuem boas qualidades de biomassa e, com isso, apresentam potencial para uso para fins energéticos. Palavras-chave: bioenergia, cinzas, Pennisetum purpureum Quality biomass in elephant grass hybrids for energy purposes ABSTRACTBesides the use as forage, elephant grass has been used as an alternative energy source. This is due to its high production capacity of biomass. It is desirable that this biomass has high fiber content, low ash, so there need to obtain a genetic material with these traits. Thus, the aim of this study was to evaluate the chemical characteristics of elephant grass hybrids and their parents for the production of energy biomass. The experiment was conducted at Empresa de Pesquisa Agropecuária do Estado do Rio de Janeiro, located in Campos, in the years 2011 and 2012 were made two cuts which were assessed: Percentage of ash (% CIN); neutral detergent fiber (FDN%) and acid (% FDA); cellulose (CEL%); hemicellulose (HEM%); and lignin (% LIG). The design was a randomized block design with three replications. The treatments were four female parents, four male parents, 16 hybrids obtained by crossing scheme partial diallel and a witness. The Means was compared by Tukey test (P <0.05). As for the traits evaluated in this study, the hybrid combinations H1, H3, H5, H7, H9 and parents P4 and P6 have good biomass qualities and, therefore, have the potential for use for energy purposes.

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