Estimative of genetic parameters in progeny test of Pinus caribaea Morelet var. hondurensis Barret & Golfari by quantitative traits and microsatellite markers
Data
2010-01-01
Autores
Tambarussi, Evandro Vagner
Sebbenn, Alexandre Magno
Moraes, Mário Luiz Teixeira de [UNESP]
Zimback, Léo
Palomino, Edwin Camacho [UNESP]
Mori, Edson Seizo [UNESP]
Título da Revista
ISSN da Revista
Título de Volume
Editor
Instituto Agronômico de Campinas
Resumo
Os objetivos deste trabalho foram estimar o coeficiente de parentesco dentro de famílias e os parâmetros genéticos e fenotípicos para os caracteres de crescimento (altura, diâmetro a altura do peito e volume) em um teste de progênies de polinização aberta de Pinus caribaea Morelet var. hondurensis Barret & Golfari, implantado no Estado de Mato Grosso do Sul, Brasil. O teste foi implantado em látice 10 x 10 triplo, com 96 famílias, três repetições e dez plantas por parcela. Quatorze anos após o plantio foram mensurados os caracteres altura total, DAP e volume das árvores. A estimativa dos coeficientes de parentesco dentro das progênies foi calculada por locos microssatélites os quais revelaram que as famílias são de meio-irmãos (^r xy = 0.253). Assim, a variância genética aditiva (σ2A) pode ser estimada, assumindo que a variância genética entre progênies (σ2p) estima ¼ da variância genética aditiva (^σ2A = 4^σ2p). As estimativas do coeficiente de herdabilidade em nível de planta (h i²) foram relativamente elevadas (0,28 para DAP e 0,44 para altura). A herdabilidade em nível de média de famílias (h m²) foi também elevada variando entre os caracteres de 0,50, a 0,58. Estes resultados sugerem que a população pode ser melhorada por seleção massal e seleção entre famílias. Adicionalmente, as estimativas dos ganhos genéticos com seleção entre e dentro famílias foram elevados (variando de 8,92% para altura a 37,56% para volume), demonstrando que este esquema de seleção pode trazer grande progresso genético.
The aims of this work were to estimate the coefficient of relatedness within families and the genetic parameters for growth related traits in a progeny test from an open-pollinated variety of Pinus caribaea Morelet hondurensis Barret & Golfari, established in Mato Grosso do Sul State, Brazil. The experimental design was the triple 10 x 10 lattice, with 96 families, three replicates, and ten plants per plot. Fourteen years after planting, the trial was measured for the following traits: total height, diameter at breast height (DBH), and true volume. The estimation of coefficients of relatedness within family from microsatellite loci indicated that families are true half-sibs (^r xy = 0.253). Thus, the additive genetic variance (σ2A) can be estimated assuming that the genetic variance among progenies (σ2p) accounts for ¼ of additive genetic variance (^σ2A = 4^σ2p). The estimative of heritability coefficients at individual level (h i²) was relatively high (0.28 for DBH and 0.44 for height). The heritability coefficient considering the average families (h m²) was also high, ranging among the traits from 0.50 to 0.58. These results suggest that the population can be improved by both massal and among families selection. Additionally, the estimated genetic gains with sequential selection among and within families were high (ranging from 8.92% for height to 37.56% for volume), demonstrating that this method of selection can generate high genetic improvement.
The aims of this work were to estimate the coefficient of relatedness within families and the genetic parameters for growth related traits in a progeny test from an open-pollinated variety of Pinus caribaea Morelet hondurensis Barret & Golfari, established in Mato Grosso do Sul State, Brazil. The experimental design was the triple 10 x 10 lattice, with 96 families, three replicates, and ten plants per plot. Fourteen years after planting, the trial was measured for the following traits: total height, diameter at breast height (DBH), and true volume. The estimation of coefficients of relatedness within family from microsatellite loci indicated that families are true half-sibs (^r xy = 0.253). Thus, the additive genetic variance (σ2A) can be estimated assuming that the genetic variance among progenies (σ2p) accounts for ¼ of additive genetic variance (^σ2A = 4^σ2p). The estimative of heritability coefficients at individual level (h i²) was relatively high (0.28 for DBH and 0.44 for height). The heritability coefficient considering the average families (h m²) was also high, ranging among the traits from 0.50 to 0.58. These results suggest that the population can be improved by both massal and among families selection. Additionally, the estimated genetic gains with sequential selection among and within families were high (ranging from 8.92% for height to 37.56% for volume), demonstrating that this method of selection can generate high genetic improvement.
Descrição
Palavras-chave
Pinus, melhoramento florestal, microssatélites, coeficiente de parentesco, Pinus, tree breeding, genetic parameters, microsatellite markers, coefficient of relatedness
Como citar
Bragantia. Instituto Agronômico de Campinas, v. 69, n. 1, p. 39-47, 2010.