Parâmetros genéticos para caracteres silviculturais em cedro australiano

Santos, Heloisa Guimarães; Rosado, Lucas Rodrigues; Rosado, Sebastião Carlos da Silva; Melo, Lucas Amaral de; Gonçalves, Flávia Maria Avelar

doi:10.18671/scifor.v49n130.05

Cited by 2 publications

(3 citation statements)

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“…Within the estimates of the components of genetic variance, there was a greater contribution of the additive genetic variance (σ² a ) than of the genetic variance between provenances (σ² proc ) for all traits (Table 3). Similar behavior to that of Toona ciliata progenies was demonstrated by Santos et al (2021). Due to a low expression of σ² proc , there was a low coe cient of determination of the effects of provenances (c² proc ), all lower than 4.5%, similar to those found in Eucalyptus urophylla provenances in tests in Brazil (Hodge and Dvorak, 2015).…”

Section: Genetic Parameterssupporting

confidence: 69%

“…Similar heritability was obtained for the H of E. erythropappus at different ages, ranging from 0.08 to 0.18 (Avelar et al 2021). In T. ciliata, higher heritability estimates were obtained for H (0.30) and DBH (0.15), but with a reduction in values with planting age due to environmental factors, such as intraspeci c competition (Santos et al 2021).…”

Section: Genetic Parametersmentioning

confidence: 97%

“…The higher magnitudes of the coe cient of variation (CVe%) may be associated with the differential response of genotypes to stressors such as aluminum toxicity, low soil fertility, water de cit, high temperatures, pest attacks, and res that may occur throughout cultivation (Santos et al 2021). In eld experiments, high values of CVe% are expected, with those between 10% and 20% being considered adequate (Pimentel-Gomes 2009).…”

Section: Genetic Parametersmentioning

confidence: 99%

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Genetic parameters and promising provenances and progenies for enhanced silvicultural traits in Eremanthus erythropappus

Almeida,

Oliveira,

Santos

et al. 2023

Preprint

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Eremanthus erythropappus, a species of economic importance for α-bisabolol production, has great potential for genetic improvement. However, limited knowledge on genetic parameters during the exploitation of commercial plantations hampers its progress. In this study, we estimated genetic parameters and correlations for silvicultural traits in a provenance and progenies test of E. erythropappus at 11 years of age, aiming to identify promising provenances and families. The experiment, conducted in Baependi, involved five provenances and 116 half-sib families in a complete randomized block design. Height (H), diameter at breast height (DBH), survival (SOB), and volume (Vol) were measured, and the REML/BLUP mixed model approach was used to estimate genetic parameters. Our results revealed significant genotype-level effects for all traits, except H at the provenance level. Narrow sense heritability ranged from 0.05 (SOB) to 0.17 (DBH), suggesting a substantial influence of environmental factors. Genotypic variation surpassed that of provenances, and positive phenotypic and genotypic correlations between growth traits were observed, ranging from moderate to strong. Notably, the provenances Itabirito and Delfim Moreira exhibited outstanding performance in terms of DBH and Vol. Furthermore, families 4, 6, 37, 118, and 124 emerged as top contenders for H, DBH, and Vol. Despite low heritability, selection strategies within and between provenances and families for silvicultural traits are viable. Importantly, high phenotypic and genotypic correlations allow for indirect selection, thus streamlining assessment efforts. These findings advance our understanding of genetic parameters providing valuable insights for the genetic improvement of E. erythropappus, fostering its sustainable utilization in various industries.

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Section: Genetic Parameterssupporting

confidence: 69%

Section: Genetic Parametersmentioning

confidence: 97%

Section: Genetic Parametersmentioning

confidence: 99%

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