Mating system estimates and effective population numbers for an isolated noble fir (Abiesprocera) clonal seed orchard in Denmark

1996 ◽  
Vol 26 (7) ◽  
pp. 1135-1141 ◽  
Author(s):  
Hans R. Siegismund ◽  
Erik D. Kjær ◽  
Ulrik Bräuner Nielsen
Keyword(s):  
Mating System ◽  
Seed Orchard ◽  
Allele Frequencies ◽  
Homogeneous Distribution ◽  
Effective Population ◽  
Population Number ◽  
Clonal Seed Orchard ◽  
Isozyme Loci ◽  
Noble Fir ◽  
Population Numbers

The mating system of a seed orchard of noble fir (Abiesprocera Rehd.) in Denmark was analyzed, with variation being found at two unlinked isozyme loci. Comparison of allele frequencies in the pollen pool fertilizing the upper and the lower parts of the trees showed a homogeneous distribution. There was no difference in the outcrossing rates estimated for cones harvested at the top and the lowermost branches carrying cones. Both were slightly greater than 1, as was the combined estimate that did not differ significantly from 1. The clones present in the seed orchard are outcrossing, and the allele frequencies found in the pollen pool agree with the frequencies found in the clones of the seed orchard on average. However, the allele frequencies varied significantly between the 20 families, suggesting that the pollen pool has been variable within the seed orchard. The inbreeding and variance effective population numbers were estimated by assuming that the differences in flowering reflected variation in gamete contribution from the clones to the offspring. The inbreeding effective population number was found to be 65% of the total number of clones. The variance effective population number was 121% of the number of clones when it was assumed that a large number of offspring were harvested from every clone.

Paternity analysis with microsatellites in a Danish Abies nordmanniana clonal seed orchard reveals dysfunctions

2006 ◽  
Vol 36 (4) ◽  
pp. 1054-1058 ◽  
Author(s):  
O K Hansen ◽  
E D Kjær
Keyword(s):  
Asymptotic Variance ◽  
Seed Orchard ◽  
Paternity Analysis ◽  
Effective Population ◽  
Population Number ◽  
Clonal Seed Orchard ◽  
Relative Contribution ◽  
Male Gametes ◽  
Abies Nordmanniana ◽  
The Status

A paternity analysis using five microsatellite markers was conducted in a Danish clonal seed orchard with 13 Abies nordmanniana (Stev.) Spach clones. The purpose was to investigate potential seed-orchard dysfunctions, with special emphasis on nonequal pollen contributions and selfing. Male paternity was found for 232 seedlings germinated from seeds collected on three ramets, each of eight clones, and the relative contribution of each clone to the gene pool of male gametes was calculated. Furthermore, 49 ramets were genotyped to check for erroneous grafting. The effect of an unbalanced male contribution was quantified by means of two measures: (1) the status number (NS), which reflects buildup of coancestry in the seed-orchard crop as a result of a low number of clones and an unequal male contribution, and (2) the asymptotic variance effective population number (Ne(v)). The contributions by pollen donors from the 13 clones were highly skewed. Three clones were fathers to more than 75% of the progenies, while making up only 24% of the ramets in the seed orchard. Four clones sired no progenies at all. The unequal contribution on the male side corresponded to NS = 4.2 and Ne(v) = 5.8. Some selfing was observed, which may give rise to concern if clonal seed orchards with few clones are established. The estimated maximum pollen contamination from outside the seed orchard was 4.3%. No grafting–labelling errors were identified.

scholarly journals Sexual Asymmetry based on Flowering Assessment in a Clonal Seed Orchard of Pinus densiflora

2004 ◽  
Vol 53 (1-6) ◽  
pp. 55-59 ◽  
Author(s):  
W.Y. Choi ◽  
K. S. Kang ◽  
K.W. Jang ◽  
S. U. Han ◽  
C. S. Kim
Keyword(s):  
Relative Frequency ◽  
Pinus Densiflora ◽  
Seed Orchard ◽  
Arithmetic Mean ◽  
Effective Number ◽  
Effective Population ◽  
Yearly Variation ◽  
Clonal Seed Orchard ◽  
Male Strobilus ◽  
Population Numbers

AbstractTwo equations were formulated in order to estimate the degree of sexual asymmetry for monoecious species. The concepts of the equations were formulated on the basis of the effective population numbers of female and male parents [i.e, As(v)], and the differences of relative frequency between genders [i.e., As(x)]. These equations were applied to estimate the degree of sexual asymmetry based on the empirical data of flowering assessment in a clonal seed orchard of Pinus densiflora. The yearly variation in the production of female and male strobili was found. The effective population numbers at gamete levels (vfand vm) and clone level (vb) varied among 8 observation years. Both As(x)and As(v)were negatively correlated with effective numbers at gamete and clone levels. Averages of female and male strobilus production and estimates of sexual asymmetry were negatively correlated but the correlation was not significant. The correlations among effective number of clone (vb), arithmetic mean of female and male effective numbers (va) and estimate of sexual asymmetry [As(x)] were strong and significant. Relatively larger difference between vb and va were found when higher level of sexual asymmetry were observed.

The mating system in a black spruce clonal seed orchard

1987 ◽  
Vol 17 (5) ◽  
pp. 379-382 ◽  
Author(s):  
J. W. Barrett ◽  
P. Knowles ◽  
W. M. Cheliak
Keyword(s):  
Mating System ◽  
Population Size ◽  
Effective Population Size ◽  
Gene Pool ◽  
Black Spruce ◽  
Seed Orchard ◽  
Effective Population ◽  
Isozyme Markers ◽  
Clonal Seed Orchard ◽  
Mating Population

Isozyme markers were used to study the mating system, estimate the effective population size, and determine the effective gene pool composition in a black spruce clonal seed orchard. Ten seeds per family were electrophoretically analyzed by embryo and megagametophytic pairs to determine their allelic and genotypic frequencies at five polymorphic loci. Single-locus estimates of outcrossing ranged from 0.682 to 1.087 (mean, 0.942), while the multilocus estimate was 0.837. The variance effective population size was calculated to be 17 individuals, comprising 13 receptive females and 4 effective males. Evidence of gene pool heterogeneity suggested a small, nonrandomly mating population within the clonal seed orchard.

Development of flowering and the effect of pruning in a clonal seed orchard of lodgepole pine

1994 ◽  
Vol 24 (1) ◽  
pp. 71-76 ◽  
Author(s):  
Anders Fries
Keyword(s):  
Population Size ◽  
Effective Population Size ◽  
Lodgepole Pine ◽  
Seed Orchard ◽  
Effective Population ◽  
Clonal Seed Orchard ◽  
Crown Volume ◽  
Female Flowering ◽  
Male Strobili

The development of female and male flowering among 20 clones was studied in a clonal seed orchard of lodgepole pine (Pinuscontorta var. latifolia Engelm.) in central Sweden. Flowering in relation to height, crown volume, and pruning was also studied. Twelve years after grafting (7 years after field planting), female flowering averaged 43 strobili per graft while male strobili were few. Eighteen years from grafting, the number of female and male strobuli were 143 and 142, respectively. The female effective population size was around 80% of maximum and was stable during the whole period. The male effective population size increased from 25 to 68%. Index of monoecy increased from 58 to 81% of maximum. The results indicate that at around 18 years after grafting, female and male flowering were satisfactorily distributed among the clones. There were no clonal correlations between male flowering and female flowering, while correlations between years for those traits separately were strong. Male flowering showed stronger correlation to the size of the graft than female flowering.

scholarly journals THE DYNAMICS OF FINITE HAPLOID POPULATIONS WITH OVERLAPPING GENERATIONS. I. MOMENTS, FIXATION PROBABILITIES AND STATIONARY DISTRIBUTIONS

Genetics ◽  
1979 ◽  
Vol 92 (1) ◽  
pp. 323-337
Author(s):  
Ted H Emigh
Keyword(s):  
Overlapping Generations ◽  
Reproductive Value ◽  
Simple Extension ◽  
Effective Population ◽  
Gene Frequencies ◽  
Population Number ◽  
Neutral Gene ◽  
Fixation Probabilities ◽  
Probability Of Fixation ◽  
Population Numbers

ABSTRACT Much of the work on finite populations with overlapping generations has been limited to deriving effective population numbers with the tacit assumption that the dynamics of the population will be similar to a population with nonoverlapping generations and the appropriate population number. In this paper, some exact and approximate results will be presented on the behavior of the first two moments of the gene frequencies. The probability of fixation of a neutral gene is found equal to the initial average reproductive value of the gene, and the means and covariances of the stable distribution with mutation in both directions are found by a simple extension of the values found by assuming nonoverlapping generations.

scholarly journals The inbreeding effective population number in dioecious populations.

Genetics ◽  
1995 ◽  
Vol 139 (1) ◽  
pp. 473-485
Author(s):  
T Nagylaki
Keyword(s):  
Effective Population ◽  
Population Number ◽  
Recursion Relations ◽  
Dioecious Populations ◽  
Population Numbers

Abstract The inbreeding effective population number in a dioecious population with discrete, nonoverlapping generations is investigated for both autosomal and X-linked loci. The recursion relations for the probabilities of genic identity, and the effective population numbers are analyzed and compared in two cases: (i) the offspring identified by sex in the calculation of the probability of common parentage and (ii) the offspring not so identified. Case i gives the correct evolution of the probabilities of identity, but case ii has been more widely studied and applied. A general symmetric framework that reduces the number of parameters is developed and used to examine a wide variety of models of panmixia and monogamy. Cases i and ii agree in many, but not all, models.

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