Genetic gain and diversity under different thinning scenarios in a breeding seed orchard of Quercus accutissima

Kang, Kyu-Suk; El‐Kassaby, Yousry A.; Han, Sim-Hee; Kim, Chang-Soo

doi:10.1016/j.foreco.2005.03.063

Cited by 9 publications

(7 citation statements)

References 10 publications

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“…Status number (N s ) is defined as half the inverse of group coancestry, N s = 0.5 / Θ (LINDGREN et al, 1996), and obtained as follows, Relative status number (N r ) was calculated as N r = N s / n (n is the total number of trees selected) for comparison among different selection scenarios (KANG et al, 2005).…”

Section: Diversity Estimated By Status Numbermentioning

confidence: 99%

“…Family plus within family selection retains a specific member of individuals in the best families (CANAVERA, 1975). Each of these selection methods will increase the expected genetic gain of a particular trait in family representation after genetic thinning, but have varying effects on the genetic diversity due to differences in family representation after selection (BONDES- SON and LINDGREN, 1993;KANG et al, 2005).…”

Section: Introductionmentioning

confidence: 99%

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Genetic Gain and Diversity under Different Selection Methods in a Breeding Seed Orchard of Quercus serrata

et al. 2007

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Genetic gain and diversity were estimated in a 13- year old Quercus serrata breeding seed orchard under three selection (rouging) methods. The selections were based on individual selection, family selection, and family plus within family selection. Genetic gain was for stem volume and gene diversity was estimated by status number concept. Both estimated genetic gain and gene diversity were compared to those before selection and among selection scenarios. Estimated genetic gain for tree volume ranged from 4.0% to 9.1% for three selection methods under 50% selection intensity. Individual selection was better than family selection for retaining higher genetic gain and status number. Family plus within family selection was the best selection method, while individual selection was more efficient at the strong selection intensity. An optimal point, which maximized gain and diversity, was occurred at 50% selection intensity that would be applied for genetic thinning in the breeding seed orchard of Quercus serrata. The effect of genetic relatedness among families and possible pollen contamination on both genetic gain and gene diversity, although were not studied but their impact, are discussed. The selection method and intensity level applied should be chosen after careful consideration of the impacts on both genetic gain and diversity for seeds produced from the seed orchard.

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Section: Diversity Estimated By Status Numbermentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Genetic Gain and Diversity under Different Selection Methods in a Breeding Seed Orchard of Quercus serrata

et al. 2007

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“…3), resulting into the observed reduction in all genetic diversity parameters ( Table 3). Reproductive output equality among orchard's clones is a major factor contributing to increased orchards' genetic efficiency (EL-KASSABY and REYNOLDS, 1990;EL-KASSABY, 1992;KANG and LINDGREN, 1999) and deviation from this situation leads to genetic erosion (BURCZYK and CHALUPKA, 1997;KANG et al, 2005) that is proportionate to the observed deviation.…”

Section: Discussionmentioning

confidence: 99%

“…Due to its high strength and density as well as its attractive color and grain pattern it is being extensively used in veneer and furniture production as well as tool handles (KFRI, 1990). Sawtooth oak is also used as an ornamental tree and valued for its acorn production as a wildlife food source (LEE, 1979;KANG et al, 2005). The species female flowers are small and inconspicuous while male flowers are pendulous, messy with yellow-green catkins.…”

Section: Introductionmentioning

confidence: 99%

Clonal Variation in Acorn Production and its Effect on the Effective Population Size in a Quercus acutissima Seed Orchard

2010

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Acorn production was surveyed for eight consecutive years (2000-2007) in a 94-clone Sawtooth oak (Quercus acutissima) seed orchard established in 1992. Acorn production commenced in 2000 and peaked in 2005 and was characterized by a 3-4 years interval. Sixty out of the orchard’s 94 clones were consistent producers across the study period. Acorn production’s Pearson productmoment and Spearman rank correlation coefficients were significant and consistently positive over the eight years study period. Parental cumulative reproductive output, represented by parental balance curves, slightly varied among mast years and showed steady improvement (less distortion) over years. Effective population size (Np) was high in moderate and good acorn production years; however, departure from clonal equal contribution was observed throughout the study period. Parental effective population size was estimated under various scenarios of male fecundity (pollen production is: 1) proportional to clone size, 2) equal to female contribution, and 3) equal across all clones) resulted in high Np and low group co-ancestry under equal male fecundity scenario while moderate Np size and group co-ancestry were observed when male fecundity was assumed to be proportional to clone size (i.e., ramet number).

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“…Among other factors, the genetic gain depends on selection intensity and heritability (a phenotypic variance ratio attributable to the genetic load of the individual) (Borrel, 2002). In addition, studies have shown the need to have a wide genetic basis (genetic diversity) for the long-term maintenance of the genetic gain in quantitative traits (Zheng, 1997;David et al, 2003;Kang et al, 2005). (Mora et al, 2007).…”

Section: Introductionmentioning

confidence: 99%

Combining genetic gain and diversity under an individual selection method in a selected provenance of Eucalyptus cladocalyx

Mora

Saavedra

2012

Cienc. Inv. Agr.

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A Bayesian threshold tree model via Gibbs sampling was used in the data analyses. The model included the genotype-environment interaction (two sites) using a bi-character threshold model. The posterior mean of the genetic correlation between the sites was positive and high (r=0.8) and, according to the 95% credible interval (0.44-0.96), it was significantly different from zero, indicating a non-significant interaction. The intensity of selection should be close to 11% to balance the gain and diversity after the individual tree selection in this breeding population.

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Genetic gain and diversity under different thinning scenarios in a breeding seed orchard of Quercus accutissima

Cited by 9 publications

References 10 publications

Genetic Gain and Diversity under Different Selection Methods in a Breeding Seed Orchard of Quercus serrata

Genetic Gain and Diversity under Different Selection Methods in a Breeding Seed Orchard of Quercus serrata

Clonal Variation in Acorn Production and its Effect on the Effective Population Size in a Quercus acutissima Seed Orchard

Combining genetic gain and diversity under an individual selection method in a selected provenance of Eucalyptus cladocalyx

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