Age trends in the genetic parameters of wood density and the relationship with growth rates in hybrid larch (Larix gmelinii var. japonica × L. kaempferi) F1

2006 ◽  
Vol 11 (3) ◽  
pp. 157-163 ◽  
Author(s):  
Takaaki Fujimoto ◽  
Kazuhito Kita ◽  
Kazuko Uchiyama ◽  
Makoto Kuromaru ◽  
Hisashi Akutsu ◽  
...  
Keyword(s):  
Wood Density ◽  
Growth Rates ◽  
Genetic Parameters ◽  
Larix Gmelinii ◽  
Hybrid Larch ◽  
Age Trends ◽  
The Relationship

Age trends in genetic parameters for growth and wood density in Eucalyptus globulus

2009 ◽  
Vol 6 (2) ◽  
pp. 179-193 ◽  
Author(s):  
Desmond J. Stackpole ◽  
René E. Vaillancourt ◽  
Marcelo de Aguigar ◽  
Brad M. Potts
Keyword(s):  
Wood Density ◽  
Eucalyptus Globulus ◽  
Genetic Parameters ◽  
Age Trends

Age trends of genetic parameters of spiral grain in hybrid larch F1 and implications for efficiency of early selection

2006 ◽  
Vol 52 (2) ◽  
pp. 101-106 ◽  
Author(s):  
Takaaki Fujimoto ◽  
Hisashi Akutsu ◽  
Kazuhito Kita ◽  
Kazuko Uchiyama ◽  
Makoto Kuromaru ◽  
...  
Keyword(s):  
Genetic Parameters ◽  
Early Selection ◽  
Hybrid Larch ◽  
Spiral Grain ◽  
Age Trends

Genetic control of intra-ring wood density variation in hybrid larch (Larix gmelinii var. japonica × L. kaempferi) F1

2007 ◽  
Vol 42 (3) ◽  
pp. 227-240 ◽  
Author(s):  
Takaaki Fujimoto ◽  
Kazuhito Kita ◽  
Makoto Kuromaru
Keyword(s):  
Genetic Control ◽  
Wood Density ◽  
Density Variation ◽  
Larix Gmelinii ◽  
Hybrid Larch

scholarly journals Sapling and coppice biomass heritabilities and potential gains from Eucalyptus polybractea progeny trials

2021 ◽  
Vol 17 (2) ◽  
Author(s):  
Beren Spencer ◽  
Richard Mazanec ◽  
Mark Gibberd ◽  
Ayalsew Zerihun
Keyword(s):  
Western Australia ◽  
Growth Rates ◽  
Genetic Parameters ◽  
Genetic Variance ◽  
Additive Genetic Variance ◽  
Short Rotation ◽  
Sapling Growth ◽  
Genetic And Phenotypic Correlations ◽  
Breeding Selections ◽  
Cross Site

AbstractEucalyptus polybractea has been planted as a short-rotation coppice crop for bioenergy in Western Australia. Historical breeding selections were based on sapling biomass and despite a long history as a coppice crop, the genetic parameters of coppicing are unknown. Here, we assessed sapling biomass at ages 3 and 6 from three progeny trials across southern Australia. After the second sapling assessment, all trees were harvested. Coppice biomass was assessed 3.5 years later. Mortality following harvest was between 1 and 2%. Additive genetic variance for the 6-sapling estimate at one site was not significant. Sapling heritabilities were between 0.06 and 0.36 at 3 years, and 0.18 and 0.20 at 6 years. The heritability for the coppice biomass was between 0.07 and 0.17. Within-site genetic and phenotypic correlations were strong between all biomass assessments. Cross-site correlations were not different from unity. Selections based on net breeding values revealed positive gains in sapling and coppice biomass. Lower or negative gains were estimated if 3-year sapling selections were applied to the coppice assessments (−7.1% to 3.4%) with useful families culled. Positive gains were obtained if 6-year sapling selections were applied to the coppice assessment (6.4% to 9.3%) but these were lower than those obtained by applying coppice selections to the coppice assessment (8.4% to 14.8%). Removal of poor performing families and families that displayed fast sapling growth rates but under-performed as coppice will benefit potential coppice production. These results indicate that selections should be made using coppice data.

scholarly journals A note on genetic parameters and accuracy of estimated breeding values in honey bees

2019 ◽  
Vol 51 (1) ◽  
Author(s):  
Evert W. Brascamp ◽  
Piter Bijma
Keyword(s):  
Honey Bees ◽  
Variance Components ◽  
Genetic Parameters ◽  
Additive Genetic Variance ◽  
Breeding Value ◽  
Phenotypic Variance ◽  
Breeding Values ◽  
Estimated Breeding Values ◽  
Additive Genetic Relationship ◽  
The Relationship

Abstract Background In honey bees, observations are usually made on colonies. The phenotype of a colony is affected by the average breeding value for the worker effect of the thousands of workers in the colony (the worker group) and by the breeding value for the queen effect of the queen of the colony. Because the worker group consists of multiple individuals, interpretation of the variance components and heritabilities of phenotypes observed on the colony and of the accuracy of selection is not straightforward. The additive genetic variance among worker groups depends on the additive genetic relationship between the drone-producing queens (DPQ) that produce the drones that mate with the queen. Results Here, we clarify how the relatedness between DPQ affects phenotypic variance, heritability and accuracy of the estimated breeding values of replacement queens. Second, we use simulation to investigate the effect of assumptions about the relatedness between DPQ in the base population on estimates of genetic parameters. Relatedness between DPQ in the base generation may differ considerably between populations because of their history. Conclusions Our results show that estimates of (co)variance components and derived genetic parameters were seriously biased (25% too high or too low) when assumptions on the relationship between DPQ in the statistical analysis did not agree with reality.

scholarly journals Generation of an Isogenic Collection of Yeast Actin Mutants and Identification of Three Interrelated Phenotypes

Genetics ◽  
2001 ◽  
Vol 157 (2) ◽  
pp. 533-543
Author(s):  
Johanna L Whitacre ◽  
Dana A Davis ◽  
Kurt A Toenjes ◽  
Sharon M Brower ◽  
Alison E M Adams
Keyword(s):  
Crystal Structure ◽  
Growth Rates ◽  
Small Region ◽  
Wild Type ◽  
Large Collection ◽  
Growth Defects ◽  
Cytoskeletal Function ◽  
Highly Correlated ◽  
The Relationship ◽  
Mutant Cells

Abstract A large collection of yeast actin mutations has been previously isolated and used in numerous studies of actin cytoskeletal function. However, the various mutations have been in congenic, rather than isogenic, backgrounds, making it difficult to compare the subtle phenotypes that are characteristic of these mutants. We have therefore placed 27 mutations in an isogenic background. We used a subset of these mutants to compare the degree to which different actin alleles are defective in sporulation, endocytosis, and growth on NaCl-containing media. We found that the three phenotypes are highly correlated. The correlations are specific and not merely a reflection of general growth defects, because the phenotypes are not correlated with growth rates under normal conditions. Significantly, those actin mutants exhibiting the most severe phenotypes in all three processes have altered residues that cluster to a small region of the actin crystal structure previously defined as the fimbrin (Sac6p)-binding site. We examined the relationship between endocytosis and growth on salt and found that shifting wild-type or actin mutant cells to high salt reduces the rate of α-factor internalization. These results suggest that actin mutants may be unable to grow on salt because of additive endocytic defects (due to mutation and salt).

Age trends in genetic parameters for growth performance across country-wide provenances of the iconic conifer tree Araucaria angustifolia show strong prospects for systematic breeding and early selection

2021 ◽  
Vol 501 ◽  
pp. 119671
Author(s):  
Rafael T. Resende ◽  
Pedro Italo T. Silva ◽  
Orzenil B. Silva-Junior ◽  
Miguel L. Menezes Freitas ◽  
Alexandre M. Sebbenn ◽  
...  
Keyword(s):  
Growth Performance ◽  
Genetic Parameters ◽  
Early Selection ◽  
Araucaria Angustifolia ◽  
Conifer Tree ◽  
Age Trends

Modeling the Growth of Salmonella in Cut Red Round Tomatoes as a Function of Temperature

2010 ◽  
Vol 73 (8) ◽  
pp. 1502-1505 ◽  
Author(s):  
WENJING PAN ◽  
DONALD W. SCHAFFNER
Keyword(s):  
Mathematical Model ◽  
Growth Rates ◽  
Low Temperatures ◽  
Safety Concern ◽  
Time Intervals ◽  
Salmonella Serotypes ◽  
Increasing Temperature ◽  
Incubation Temperatures ◽  
Raw Poultry ◽  
The Relationship

Tomato-associated Salmonella outbreaks have recently become a significant food safety concern. Temperature abuse of cut tomatoes may have played a role in some of these outbreaks. The purpose of this study was to develop a mathematical model to describe the growth of Salmonella on cut tomatoes at various temperatures. Four Salmonella serotypes (Typhimurium, Newport, Javiana, and Braenderup) obtained from previous tomato-linked cases of salmonellosis were used in this study. These four serotypes were cultured separately, combined into a cocktail, and inoculated onto whole red round tomatoes and allowed to dry overnight. The tomatoes were then cut into pieces and incubated at a predetermined range of temperatures (10, 12.5, 15, 17.5, 20, 22.5, 25, 27.5, 30, and 35°C). Salmonella concentration was measured at specified time intervals to determine the growth curve for Salmonella on cut tomatoes at each temperature. The growth rates were calculated using DMFit and used to build a mathematical model to illustrate the relationship between the growth rates of Salmonella on tomatoes and incubation temperatures from 10 to 35°C. The resulting model compared favorably with a Salmonella growth model for raw poultry developed by our laboratory. The Pathogen Modeling Program underpredicted growth at low temperatures and overpredicted growth at high temperatures. ComBase predicted consistently slower growth rates than were observed in tomatoes but showed parallel increases in growth rate with increasing temperature.

scholarly journals Adjacency to a harvest trail increases drought resistance of interior Douglas-fir (Pseudotsuga menziesii var. glauca) in partially harvested stands in central British Columbia

2018 ◽  
Vol 48 (7) ◽  
pp. 809-820 ◽  
Author(s):  
Neil P. Thompson ◽  
Kathy J. Lewis ◽  
Lisa M. Poirier
Keyword(s):  
British Columbia ◽  
Drought Tolerance ◽  
Pseudotsuga Menziesii ◽  
Growth Rates ◽  
Habitat Management ◽  
Odocoileus Hemionus ◽  
Douglas Fir ◽  
Ring Analysis ◽  
The Relationship

Drought tolerance of trees may be affected by competition, but most studies quantifying the relationship do not consider the effect of stem clustering. Trees are often clustered in interior Douglas-fir (Pseudotsuga menziesii var. glauca (Mayr) Franco) forests near the grassland interface in central British Columbia due to past harvesting practices or habitat management for mule deer (Odocoileus hemionus hemionus (Rafinesque, 1817)). Climate change projections indicate continued increases in temperature, an outcome that would stress trees growing in dry environments. Trees placed in different states of competition by mechanical harvesting in the 1970s were sampled to provide a 40-year comparison of three levels of competition during 1–2 year droughts. Tree-ring analysis was used to assess the reduction in growth during drought years and resumption of growth in subsequent years. A clear separation of growth rates was evident between open-growing trees, trees on the edge of harvesting trails, and trees within the unharvested interior. Edge trees had intermediate growth rates but no differences were found in the long-term climate–growth relationship compared with open-growing trees. Both Edge and Open classes showed less relative growth reduction during droughts than Interior trees growing between harvest trails. Precipitation throughfall rates and competition for resources are likely driving short-term drought tolerance in combination with other factors.

Mobilizing Restraint: Democracy and Industrial Conflict in Post-Reform South Asia. By Emmanuel Teitelbaum. Ithaca, NY: Cornell University Press, 2011. 248p. $65.00 cloth, $24.95 paper.

2012 ◽  
Vol 10 (3) ◽  
pp. 809-811
Author(s):  
Erik Martinez Kuhonta
Keyword(s):  
Growth Rates ◽  
East Asian ◽  
High Growth ◽  
Political Stability ◽  
Authoritarian Regimes ◽  
Development Model ◽  
Regime Type ◽  
The Political ◽  
Cornell University ◽  
The Relationship

A major debate in the literature on the political economy of development centers on the relationship between regime type and economic development. This debate has been heavily influenced by the East Asian development model, where authoritarianism has often gone hand in hand with high growth rates. In South Korea, Taiwan, Singapore, Malaysia, and Indonesia, development has been propelled by authoritarian or semidemocratic regimes. One key element of this argument is that the repression of labor under these authoritarian regimes has been especially helpful in states' pursuit of high growth rates because it has ensured political stability and checked societal demands.

Sign in / Sign up

Export Citation Format

Share Document