Flowering and cone production variability and its effect on parental balance in a Scots pine clonal seed orchard

Burczyk, Jarosław; Chalupka, W.

doi:10.1051/forest:19970201

Cited by 80 publications

(71 citation statements)

References 9 publications

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“…Estimates of multi-locus outcrossing rates indicate that over 97.0 % of seedlings will be of an out-crossed nature (BURCZYK, 1998;BURCZYK and CHALUPKA, 1997). Low levels of selfing would not appreciably increase inbreeding depression in gene resource plantations because in conifers most selfed seed are aborted early due to an accumulation of lethal recessives.…”

Section: Selfingmentioning

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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Section: Selfingmentioning

confidence: 99%

Optimal Clone Number for Seed Orchards with Tested Clones

Lindgren

Prescher

2005

Silvae Genetica

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“…Variation in reproductive output and phenology has been studied in many forest tree species (ERIKSSON et al, 1973;SCHOEN et al, 1986;REYNOLDS and EL-KASSABY, 1990;MATZIRIS, 1993;BURCZYK and CHALUPKA, 1997). Such variation accumulates relatedness and inbreeding in the progeny, and consequently affects the genetic quality of seed.…”

Section: Fertility Variationmentioning

confidence: 99%

“…The concept "effective population size of an orchard" as found in the literature often includes variation in the reproductive success of orchard parents, and thus treats fertility as a property of the parent (e.g., MUONA and HARJU, 1989;KJAER, 1996;BURCZYK and CHALUPKA, 1997). It could be argued that differences in reproductive success are better seen as a characteristic of the resulting seed crop, and the relevant effective number is "status number of the seed orchard crop" (LINDGREN and MULLIN, 1998).…”

Section: Status Numbermentioning

confidence: 99%

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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“…However, while many studies were conducted on the interaction between reproductive and growth characteristics in different forest tree species (e.g. Jonsson et al, 1976;Bhumibhamon, 1978;Burczyk and Chalupka, 1997;Nikkanen and Velling, 1987), it has not been studied on carob tree, yet.…”

Section: Introductionmentioning

confidence: 99%

Interaction of Growth and Reproduction Characteristics in Carob Tree (Ceratonia Siliqua L.) Populations

Keleş¹,

BILIR²

2015

AgricultForest

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This study was carried out in three natural populations of Carob tree (Ceratonia siliqua L.) to determine the difference and interaction for reproductive and growth characteristics among populations and within population based on tree height, diameter at base, crown diameter and age, and number and weights of pod and seed for two consecutive years (2013&2014).Large differences accordance with results of analysis of variance was found among populations and within population, and also between years for reproductive and growth characteristics. Averages of reproductive characteristics were higher in first year than that of second year. For instance, weight of pod was between 9.8 kg and 59.9 kg in a population in first year, while it was between 8.1 kg and 65.2 at the same population for second year. Weights of pod were 3.9 kg and 2.3 kg in polled populations for first and second year, respectively. The most productive ten trees produced more than 30% of total seed and pod productions in the populations. The relations among the characteristics changed for the years and populations.

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Flowering and cone production variability and its effect on parental balance in a Scots pine clonal seed orchard

Cited by 80 publications

References 9 publications

Optimal Clone Number for Seed Orchards with Tested Clones

Optimal Clone Number for Seed Orchards with Tested Clones

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

Interaction of Growth and Reproduction Characteristics in Carob Tree (Ceratonia Siliqua L.) Populations

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