Estimation of fertility variation in forest tree populations

Kang, Kyu-Suk

doi:10.1093/forestry/76.3.329

Cited by 66 publications

(82 citation statements)

References 1 publication

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“…Fertility variation was relatively low throughout the fiveyear period (Table 2), compared to the review by KANG et al (2003). Clone fertility and fertility variation are likely to change over time even if none of the clones are replaced or removed.…”

Section: Fertility Variationmentioning

confidence: 92%

Fertility Variation, Genetic Relatedness, and Their Impacts on Gene Diversity of Seeds From a Seed Orchard of Pinus thunbergii

Kang¹,

Lindgren

Mullin

2004

Silvae Genetica

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Clonal differences in the number of male and female strobili were determined for five consecutive years in a clonal seed orchard of Pinus thunbergii in Korea. The effects of relatedness and clonal differences in reproductive development on gene diversity of seed (in terms of accumulated relatedness by status number) were estimated. While clonal differences were found, fertility variation was not large through all studied years. The orchard clones were divided into different regions and locations based on the geographical distribution and distance of natural stands that plus trees were selected from. Assuming that there was no relatedness among regions, locations and clones, the status number (N s ) was varied from 47.6 to 55.5 for five successive years. On average (pooling), N s was 92% of census number (N). Assumed relatedness among regions, locations and/or clones decreased the status number. Effect of parental selection on relatedness and orchard management was also discussed.

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Section: Fertility Variationmentioning

confidence: 92%

Fertility Variation, Genetic Relatedness, and Their Impacts on Gene Diversity of Seeds From a Seed Orchard of Pinus thunbergii

Kang¹,

Lindgren

Mullin

2004

Silvae Genetica

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“…High fertility variation has also been reported in a pedigreed E. tereticornis seedling seed orchard in Tamil nadu . KANG et al (2003) reported an average Ψ value of 2.62 for seed orchards of broadleaved species. Generally sibling coefficient values may be high in young orchards and during poor flowering years .…”

Section: Fertility In Eucalypt Orchards and Speciesmentioning

confidence: 99%

Fertility Variation and its Implications on Relatedness in Seed Crops in Seedling Seed Orchards of Eucalyptus camaldulensis and E. tereticornis

2007

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Seedling seed orchards of Eucalyptus tereticornis (N = 192 & 505) and E. camaldulensis (N = 182 & 525) were established at two sites (one moist and one dry) in southern India. The fertility (based on the number of flowers and fruits) was registered for each tree at age eight and nine years. E. camaldulensis on the moist location had 73 % fertile trees and low fertility difference (sibling coefficient, Ψ, was 2.27) at eight years. whereas Only 23 % trees were fertile in the E. tereticornis orchard at the same site and the fertility variation was high (Ψ =11.71). In the dry location, fertility was almost the same in both species at nine years, with 45 & 51% fertile trees in E. camaldulensis (Ψ = 5.4) and E. tereticornis (Ψ = 5.2) respectively. Though the fertility trends were the same in both years, the number of fertile trees was comparatively higher at nine years (except in the low flowering E. tereticornis orchard at the moist site) in both the sites. Gene diversity values of the seed crop estimated for two consecutive years are fairly high except for the E. tereticornis (GD = 0.9650 and 0.9690) orchard located in the moist site. The implications of fertility variation on diversity of progeny have been discussed in the light of domestication strategies and tree breeding programs implemented for eucalypts.

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“…A review suggests Ψ (Ss) = 2 may be used for seed orchard clones as a heuristic rule (KANG et al, 2003). NIKKANEN and RUOTSALAINEN (2000) found 1/0.59 = Ψ (Ss) = 1.8 for a Norway spruce seed orchard.…”

Section: Sibling Coefficientmentioning

confidence: 99%

Optimal Clone Number for Seed Orchards with Tested Clones

Lindgren

Prescher

2005

Silvae Genetica

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The optimal number of clones in seed orchards is discussed. A model is constructed to maximize a goodness criterion (“benefit”) for seed orchards. This criterion is a function of: 1) the number of tested genotypes available for selection and planted in seed orchard; 2) the contribution to pollination from: a) the ramet itself; b) the closest neighbors; c) the rest of the orchard and sources outside the orchard (contamination); 3) variation among genotypes for fertility; 4) frequency of selfing; 5) production of selfed genotypes; 6) gene diversity (= status number); 7) influence of contamination; 8) genetic variation among candidates; 9) correlation between selection criterion (e.g. height in progeny test) and value for forestry (e.g. production in forests from the orchard); and 10) the number of clones harvested. Numeric values of the entries are discussed, and values were chosen to be relevant for scenarios with Swedish conifers (focusing on Scots pine) and for loblolly pine. Benefit was maximized considering the number of clones. The optimum was 16 clones for the Swedish scenario, while less for the loblolly pine scenario. The optimum was rather broad, thus it is not essential to deploy the exact optimum, and an approximate optimum will do. A sensitivity analyses was performed to evaluate the importance of the likely uncertainty and variation in different entries. Quantification of the benefit of gene diversity is important. Other significant considerations are the genetic variance in the goal character and the ability to predict it, as well as the impact of selfing and the variation in reproductive success between clones. Twenty clones is suggested as a thumb rule for Swedish conifers.

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Estimation of fertility variation in forest tree populations

Cited by 66 publications

References 1 publication

Fertility Variation, Genetic Relatedness, and Their Impacts on Gene Diversity of Seeds From a Seed Orchard of Pinus thunbergii

Fertility Variation, Genetic Relatedness, and Their Impacts on Gene Diversity of Seeds From a Seed Orchard of Pinus thunbergii

Fertility Variation and its Implications on Relatedness in Seed Crops in Seedling Seed Orchards of Eucalyptus camaldulensis and E. tereticornis

Optimal Clone Number for Seed Orchards with Tested Clones

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