scholarly journals Genetic variation, mating patterns and gene flow in a Pinus pinaster Aiton clonal seed orchard

2008 ◽  
Vol 65 (7) ◽  
pp. 706-706 ◽  
Author(s):  
Lúcia Fernandes ◽  
Margarida Rocheta ◽  
Jorge Cordeiro ◽  
Sandra Pereira ◽  
Sophie Gerber ◽  
...  
Keyword(s):  
Genetic Variation ◽  
Gene Flow ◽  
Pinus Pinaster ◽  
Seed Orchard ◽  
Mating Patterns ◽  
Clonal Seed Orchard

scholarly journals Genetic Gain and Diversity of Orchard Crops Under Alternative Management Options in a Clonal Seed Orchard of Pinus thunbergii

2005 ◽  
Vol 54 (1-6) ◽  
pp. 93-96 ◽  
Author(s):  
Kyu-Suk Kang ◽  
D. Lindgren ◽  
T. J. Mullin ◽  
W.-Y. Choi ◽  
S.-U. Han
Keyword(s):  
Gene Flow ◽  
Genetic Gain ◽  
Seed Orchard ◽  
Pinus Thunbergii ◽  
Management Options ◽  
Pollen Contamination ◽  
Clonal Seed Orchard ◽  
Selective Harvest ◽  
Status Number ◽  
Seed Crops

Abstract Genetic gain and diversity, expressed by status number, of seed crops from a clonal seed orchard of Pinus thunbergii were estimated considering selection, fertility variation and pollen contamination, and compared for different management alternatives (selective harvest, genetic thinning and combination of both options). Management variables included the proportion of clones left after selective harvest and/or genetic thinning. The impact on genetic gain and diversity of seed crops was quantified as a function of the quantity and quality of gene flow from outside the seed orchard. Genetic gain varied with the proportion of selected or thinned clones. Genetic thinning by means of truncation selection of clones resulted in a large decrease in status number, which was accompanied by greater genetic gain than achieved by selective harvest alone. As expected, gene flow from outside the seed orchard greatly increased status number of the seed crop at higher rates of pollen contamination under all management options. The formulae and results of the present study could be used for identifying favorable selection intensity and alternatives for orchard management.

scholarly journals Age trends in genetic parameters of wood density components in 46 half-sibling families of Pinus pinaster

2008 ◽  
Vol 38 (6) ◽  
pp. 1470-1477 ◽  
Author(s):  
Maria João Gaspar ◽  
José Luís Louzada ◽  
Maria Emília Silva ◽  
Alexandre Aguiar ◽  
Maria Helena Almeida
Keyword(s):  
Wood Density ◽  
Pinus Pinaster ◽  
Wood Quality ◽  
Genetic Correlations ◽  
Ring Width ◽  
Seed Orchard ◽  
Narrow Sense Heritability ◽  
Clonal Seed Orchard ◽  
Ring Number ◽  
Latewood Density

This study contributes to the Pinus pinaster Ait. breeding programme, which is reaching the third generation by adding information on wood quality of 46 open-pollinated families from a progeny trial located in Leiria, Portugal, that originated from seed collected in a clonal seed orchard. A total of 552 seventeen-year-old trees were sampled at 2 m height. Trends were studied from the pith outward in variance components and narrow-sense heritability (h2) of wood density components and ring-width characteristics as well as genetic correlations between cambial ages. Mean ring density (RD), minimum density (MND), maximum density (MXD), earlywood density (EWD), latewood density (LWD), earlywood width, latewood width, ring width, latewood percentage, and heterogeneity index were determined using X-ray densitometry procedures. RD had higher genetic control (h2 = 0.63), and heritability values of earlywood components (h2MND = 0.54, h2EWD = 0.60) exceeded those of latewood components (h2MXD = 0.34, h2LWD = 0.26). Heritabilities increased with ring number from pith for almost all wood density components, and there were high age–age genetic correlations for wood density traits (rg > 0.98).

scholarly journals Genetic Variation in Reproductive Traits in a Clonal Seed Orchard of Prunus avium in Northern Spain

2008 ◽  
Vol 57 (1-6) ◽  
pp. 110-118 ◽  
Author(s):  
R. Díaz ◽  
E. Merlo
Keyword(s):  
Genetic Variation ◽  
Prunus Avium ◽  
Reproductive Traits ◽  
Seed Orchard ◽  
Reproductive Phenology ◽  
Broad Sense Heritability ◽  
Northern Spain ◽  
Flowering Stage ◽  
Clonal Seed Orchard ◽  
Northwestern Spain

AbstractIn the present study we investigated the reproductive phenology of Prunus avium in a seed orchard located in northwestern Spain. The study was carried out with 103 clones from 7 provenance regions in northern Spain. The most advanced flowering stage on different dates and the number of flowers and cherries were monitored over two consecutive years. Significant differences among clones were found for all of the studied traits, with high broad-sense heritability estimates for all, except duration of flowering and synchronization index, both of which showed moderate heritability. In general, there was good overall reproductive synchronization in the seed orchard, although two groups of clones were differentiated. Clones from two out of the seven populations studied flowered later and were less well synchronized. The clonal differentiation was correlated with geoclimatic variables, suggesting that clones from lower altitudes and higher temperatures tend to an earlier flowering.

Segregation at enzyme loci in megagametophytes of white spruce, Picea glauca

1986 ◽  
Vol 28 (1) ◽  
pp. 149-153 ◽  
Author(s):  
Steven Craig Stewart ◽  
Daniel J. Schoen
Keyword(s):  
Genetic Variation ◽  
Picea Glauca ◽  
White Spruce ◽  
Seed Orchard ◽  
Mendelian Inheritance ◽  
Mating Pattern ◽  
Enzyme Locus ◽  
Clonal Seed Orchard ◽  
Enzyme Loci ◽  
Made In

Segregation patterns of six enzyme loci expressed in megagametophytes of white spruce (Picea glauca) were studied as part of an investigation of the mating pattern in a clonal seed orchard. More than 3000 megagametophytes from 79 trees representing 18 clones were assayed. The single locus patterns of segregation for each enzyme locus are consistent with simple Mendelian inheritance. The two locus patterns of segregation reveal that Idh and Gdh are tightly linked with an estimated recombination rate of 0.027 ± 0.004. No other pair of loci deviates significantly from the ratios expected for unlinked loci. Little heterogeneity in the pattern of gametic segregation was detected among ramets within clones or among clones for any of the loci. The results contribute to knowledge of genetic variation in this species and provide a basis for assumptions about segregation made in mating system estimation models.Key words: segregation, linkage, allozymes, Picea glauca, white spruce.

scholarly journals Mating system and gene flow of Nothofagus alpina (Poepp. & Endl.) Oerst. in a clonal seed orchard

2017 ◽  
Vol 47 (1) ◽  
Author(s):  
Luz Cecilia García Cruzatty ◽  
Ricardo Riegel ◽  
Magaly Rivero ◽  
Judith Carrasco ◽  
Fernando Droppelmann
Keyword(s):  
Gene Flow ◽  
Mating System ◽  
Seed Orchard ◽  
Clonal Seed Orchard

Mating patterns in an indoor miniature Cryptomeria japonica seed orchard as revealed by microsatellite markers

New Forests ◽  
2009 ◽  
Vol 39 (3) ◽  
pp. 261-273 ◽  
Author(s):  
Yoshinari Moriguchi ◽  
Yoko Yamazaki ◽  
Hideaki Taira ◽  
Yoshihiko Tsumura
Keyword(s):  
Microsatellite Markers ◽  
Cryptomeria Japonica ◽  
Seed Orchard ◽  
Mating Patterns

scholarly journals Estimation of Genetic and Phenotypic Parameters for Growth Traits in a Clonal Seed Orchard of Pinus kesiya in Malawi

ISRN Forestry ◽  
2013 ◽  
Vol 2013 ◽  
pp. 1-6 ◽  
Author(s):  
Edward Missanjo ◽  
Gift Kamanga-Thole ◽  
Vidah Manda
Keyword(s):  
Growth Traits ◽  
Seed Orchard ◽  
Direct Selection ◽  
Tree Model ◽  
Individual Tree ◽  
Individual Level ◽  
Clonal Seed Orchard ◽  
Pinus Kesiya ◽  
Individual Tree Model ◽  
The Individual

Genetic and phenotypic parameters for height, diameter at breast height (dbh), and volume were estimated for Pinus kesiya Royle ex Gordon clonal seed orchard in Malawi using an ASReml program, fitting an individual tree model. The data were from 88 clones assessed at 18, 23, 30, 35, and 40 years of age. Heritability estimates for height, dbh, and volume were moderate to high ranging from 0.19 to 0.54, from 0.14 to 0.53, and from 0.20 to 0.59, respectively, suggesting a strong genetic control of the traits at the individual level, among families, and within families. The genetic and phenotypic correlations between the growth traits were significantly high and ranged from 0.69 to 0.97 and from 0.60 to 0.95, respectively. This suggests the possibility of indirect selection in trait with direct selection in another trait. The predicted genetic gains showed that the optimal rotational age of the Pinus kesiya clonal seed orchard is 30 years; therefore, it is recommended to establish a new Pinus kesiya clonal seed orchard. However, selective harvest of clones with high breeding values in the old seed orchard should be considered so that the best parents in the old orchard can continue to contribute until the new orchard is well established.

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