Genetics of cone morphology in white spruce (Picea glauca)

1974 ◽  
Vol 52 (1) ◽  
pp. 15-21 ◽  
Author(s):  
M. A. K. Khalil

A study was conducted in 1971 to estimate the degree of genetic control on the characters of cone morphology of white spruce (Picea glauca (Moench) Voss) from two areas of central Newfoundland and to determine whether these characters were associated with phenotypic superiority in growth. Hierarchical sampling was done, selecting two locations, two populations at each location, five trees in each population, and 20 cones from each tree. Ten characters were studied. Statistical analysis techniques used were calculation of repeatability as an estimate of heritability, hierarchical analysis of variance, and comparison of the populations of "ordinary" and "plus" trees, using Student's ‘t’ and Snedecor's 'F' tests.The results indicate that most of the 10 characters studied are under strong genetic control but these characters are not associated with phenotypic superiority in growth.

Heredity ◽  
2018 ◽  
Vol 121 (2) ◽  
pp. 142-154 ◽  
Author(s):  
Claudia Méndez-Espinoza ◽  
Geneviève J. Parent ◽  
Patrick Lenz ◽  
André Rainville ◽  
Laurence Tremblay ◽  
...  

2010 ◽  
Vol 40 (4) ◽  
pp. 703-715 ◽  
Author(s):  
Patrick Lenz ◽  
Alain Cloutier ◽  
John MacKay ◽  
Jean Beaulieu

We investigated the genetic control of wood properties as a function of cambial age to enable improvement of juvenile wood attributes in white spruce ( Picea glauca (Moench) Voss). Increment cores were taken from 375 trees randomly selected from 25 open-pollinated families in a provenance–progeny trial repeated on three sites. High-resolution pith-to-bark profiles were obtained for microfibril angle (MFA), modulus of elasticity (MOE), wood density, tracheid diameter and cell wall thickness, fibre coarseness, and specific fibre surface with the SilviScan technology. Heritability estimates indicated that genetic control of cell anatomy traits and wood density increased with cambial age, whereas the genetic control of MFA and MOE remained relatively low across growth rings. Wood density, radial cell diameter, cell wall thickness, and specific fibre surface were highly heritable, indicating that significant genetic gains could be expected in tree improvement programs, although cambial age at selection may strongly influence the magnitude of realized gains. In contrast, growth-related properties, such as ring width, core length, and tree height, gave weak or nonsignificant heritability estimates. Adverse correlations between mechanical strength and properties related to paper quality suggest that breeding strategies must incorporate both types of traits to improve white spruce wood quality for different end uses.


1990 ◽  
Vol 68 (7) ◽  
pp. 1420-1422 ◽  
Author(s):  
Bryan F. J. Manly

It has recently been suggested that problems with the statistical analysis of niche overlap data can be overcome by computing overlaps between randomly paired individuals. This allows a test for temporal changes in the overlap between two populations. In this paper, it is suggested that this test relies too heavily on random pairing. It is argued that a better test is one based on an analysis of variance of niche overlaps between all possible pairings that can be made at the same time, with the significance level being determined by bootstrapping.


2011 ◽  
Vol 41 (6) ◽  
pp. 1308-1318 ◽  
Author(s):  
J. Gravel-Grenier ◽  
M.S. Lamhamedi ◽  
J. Beaulieu ◽  
S. Carles ◽  
H.A. Margolis ◽  
...  

Family genetic variability of the rooting characteristics of white spruce ( Picea glauca (Moench) Voss) cuttings harvested from 3-year-old stock plants was evaluated for 75 half-sib families. Growth, root system architecture, and gas exchange of the cuttings during the rooting phase (B+0) and the two subsequent growing seasons (B+1 and B+2) were evaluated. The root initiation phase (B+0) and the root development phases (B+1 and B+2) were found to be under strong genetic control. The weak correlations found between B+0 and the B+1 and B+2 phases may indicate that gene expression during B+0 is not related to root growth and development during B+1 and B+2. Strong positive correlations were observed between plant root and aboveground characteristics at the end of the B+1 and B+2 phases. This suggests that an indirect and efficient selection for white spruce families producing cuttings with heavier root dry masses could be based on the measures of aboveground morphological characteristics. Finally, the strong genetic control of morphological characteristics found in this study indicates that the selection of superior genotypes at a clonal level is possible for intensive forest management.


1990 ◽  
Vol 68 (8) ◽  
pp. 1661-1666 ◽  
Author(s):  
David J. Innes ◽  
Gordon G. Ringius

Allozyme variation at four polymorphic enzyme loci (Pgi-1, Pgi-2, Pgm, Gdh) was used to study genetic variation and mating system in a sheltered (inland) and an adjacent exposed population (coast) of white spruce (Picea glauca (Moench) Voss) in eastern Newfoundland. Despite habitat differences, the two populations showed only small differences in allele frequency for the maternal trees, their progeny, and the estimated pollen pool. Three of the four single-locus estimates of outcrossing rate (ts) for the inland population were significantly less that t = 1.00, with an average value of ts = 0.81. Two of the four single-locus estimates of outcrossing rate in the coast population were significantly less than t = 1.00 and the average for the four loci was 0.71. The multilocus estimates of outcrossing rate (tm) for the inland and coast populations were 0.76 and 0.70, respectively, and both estimates were significantly less than t = 1.00. This level of selfing is higher than that observed for most other conifer species. Key words: genetics, mating system, population genetics, outcrossing, selfing, white spruce.


Author(s):  
Izabela Gąska ◽  
Katarzyna Sygit ◽  
Elżbieta Cipora ◽  
Marian Sygit ◽  
Anna Pacian ◽  
...  

Introduction: The basic determinant of healthy behaviour—among other human behaviours—is the fact that it consistently affects health. Nowadays, health behaviour studies are considered to be an important method of measuring the health of a population. Objective: To assess the health behaviours and value-based health analysis of people aged 50+ who were hospitalized due to cardiovascular disease, depending on the selected descriptive variables. Materials and methods: The study was conducted between April 2018 and December 2018 among 411 subjects aged 50+ who were hospitalized due to cardiovascular disease at the Independent Public Health Care Unit in Sanok (Podkarpackie voivodship in Poland). The method used in the study was a diagnostic survey. The study used the authors’ survey questionnaire and two standardized tests: Inventory of Health-Related Behaviour (IHB) and List of Health Criteria (LHC). A statistical analysis was carried out in the R program, version 3.5.1. The obtained results were subjected to thorough statistical analysis using the following tests: Student’s t, Mann–Whitney U, ANOVA, Kruskal–Wallis, Fisher’s Least Significant Difference (LSD), Pearson, and Spearman. Results: The strongest correlation between health status and health behaviours (according to the IHB questionnaire) was in the area of ‘health practices’, while the lowest correlation was found in the areas of ‘correct eating habits’ and ‘preventive behaviours’. Based on the LHC questionnaire, the most important health criteria according to the subjects were ‘not feeling any physical ailments’; ‘having all body parts functional’; ‘feeling well’; ‘eating properly’; and ‘infrequent need of going to the doctor’. A positive correlation was found in the group of respondents where the ‘preventive health behaviours’ were more intense; herein, the more important criterion for the respondents was ‘eating properly’. Conclusions: Respondents aged 50+ and hospitalized for cardiovascular diseases indicated (based on the IHB questionnaire) that health behaviours in the area of ‘health practices’ had the strongest correlation with their health, while the lowest correlation was found in the areas of ‘correct eating habits’ and ‘preventive behaviours’. According to the respondents, the most important criteria determining health (according to the LHC questionnaire) included ’not feeling any physical ailments’; ‘having all body parts functional’; ‘feeling well’; ‘eating properly’; and ‘infrequent need of going to the doctor’. Based on the information collected from the respondents, it was found that the most important criteria determining health depended on selected descriptive variables, such as age, gender, place of residence, education, and marital status.


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