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Skip to Search Results- 11Spaner, Dean
- 11Yang, Rong-Cai
- 3Hu, Zhiqiu
- 3Álvarez-Castro, José M.
- 2Brathwaite, R. A. I.
- 2Dixon, Peggy L.
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A new distribution-free approach to constructing the confidence region for multiple parameters
Download2013
Construction of confidence intervals or regions is an important part of statistical inference. The usual approach to constructing a confidence interval for a single parameter or confidence region for two or more parameters requires that the distribution of estimated parameters is known or can be...
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Analysis of genotype-environment interactions from a genome-wide survey of quantitative trait loci in a barley population
Download2010-01-01
Ham, Bangjoo, Spaner, Dean, Rahman, M. H., Yeh, F. C., Yang, Rong-Cai
The presence of genotype-environment interactions (GE) leads to the imperfect genetic correlation between the measurements of the same trait in different environments, thereby limiting the ability of plant breeders to identify superior breeding lines or best cultivars across the environments. We...
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Analysis of linear and nonlinear genotype × environment interaction
2014
The usual analysis of genotype × environment interaction (G × E) is based on the linear regression of genotypic performance on environmental changes (e.g., classic stability analysis). This linear model may often lead to lumping together of the non-linear responses to the whole range of...
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Clarifying the relationship between average excesses and average effects of allele substitutions
Download2012
Yang, Rong-Cai, Álvarez-Castro, José M.
Fisher’s concepts of average effects and average excesses are at the core of the quantitative genetics theory. Their meaning and relationship have regularly been discussed and clarified. Here we develop a generalized set of one locus two-allele orthogonal contrasts for average excesses and...
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Collection and characterization of maize and upland rice populations cropped by resource-poor farmers in the uplands of Panama's Azuero region
Download2009
Spaner, Dean, Dreisigacker, Susanne, Love, Brian
The conservation of crop genetic resources is an international priority and requires the continued collection and characterization of farmer varieties. We collected and characterized maize and upland rice populations cropped by farmers in Panama's Azuero region. The objective of our study was to...
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Competitive traits and the stability of wheat cultivars in differing natural weed environments on the northern Canadian prairies
Download2008
Mason, Heather E., Goonewardene, Laksiri A., Spaner, Dean
Nine spring wheat cultivars, selected on the basis of height, tillering capacity and maturity, were grown in differing levels of natural weed presence at three locations in Edmonton and New Norway, Alberta between 2003 and 2004. The objectives of the study were to (1) identify competitive traits...
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2011-01-01
Iqbal, Muhammad, Fayyaz, Muhammad, Shahzad, Armghan, Ahmed, Iftikhar, Ali, Ghulam M., Masood, Shahid, Spaner, Dean
Vernalization response genes are known to contribute indirectly to grain yield by influencing flowering time, number of tillers and spikelets in sensitive wheat genotypes. There has been no report of the effect of vernalization on grain fill duration and grain weight in wheat. The objective of...
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2008-01-01
Yang, Rong-Cai, Álvarez-Castro, José M.
Mapping quantitative trait loci (QTL) is often based on a functional or statistical model of gene action involving two alleles per locus. Such model is adequate for mapping populations derived from a cross between two inbred lines as in many plants and some laboratory animals and for di-allelic...
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1992-01-01
Yang, Rong-Cai, Yeh, Francis C.
To counteract loss of genetic diversity crucial for current and future tree improvement, tree breeders have conserved forest genetic resources in situ in their natural ecosystems in protected areas or ex situ in plantations, seed orchards, and breeding arboreta. This article reviews the genetic...
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Genetic variation and climatic impacts on survival and growth of white spruce in Alberta, Canada
Download2007-01-01
Rweyongeza, Deogratias M., Yang, Rong-Cai, Dhir, N. K., Barnhardt, L. K., Hansen, C.
Because climate has the greatest effect in determining the genetic structure of forest tree species, climatic variables with large effects on growth and survival need to be identified. This would enable proper matching of tree populations to planting sites in the present and future climates. We...