Mapping of quantitative trait loci controlling adaptive traits in coastal Douglas-fir. II. Spring and fall cold-hardiness

2001 ◽  
Vol 102 (8) ◽  
pp. 1152-1158 ◽  
Author(s):  
K. D. Jermstad ◽  
D. L. Bassoni ◽  
N. C. Wheeler ◽  
T. S. Anekonda ◽  
S. N. Aitken ◽  
...  
Keyword(s):  
Quantitative Trait Loci ◽  
Quantitative Trait ◽  
Cold Hardiness ◽  
Douglas Fir ◽  
Adaptive Traits ◽  
Trait Loci

Mapping of quantitative trait loci controlling adaptive traits in coastal Douglas-fir. IV. Cold-hardiness QTL verification and candidate gene mapping

2005 ◽  
Vol 15 (2) ◽  
pp. 145-156 ◽  
Author(s):  
Nicholas C. Wheeler ◽  
Kathleen D. Jermstad ◽  
Konstantin Krutovsky ◽  
Sally N. Aitken ◽  
Glenn T. Howe ◽  
...  
Keyword(s):  
Quantitative Trait Loci ◽  
Gene Mapping ◽  
Candidate Gene ◽  
Quantitative Trait ◽  
Cold Hardiness ◽  
Douglas Fir ◽  
Adaptive Traits ◽  
Trait Loci ◽  
Candidate Gene Mapping ◽  
Qtl Verification

scholarly journals Mapping of Quantitative Trait Loci Controlling Adaptive Traits in Coastal Douglas Fir. III. Quantitative Trait Loci-by-Environment Interactions

Genetics ◽  
2003 ◽  
Vol 165 (3) ◽  
pp. 1489-1506
Author(s):  
Kathleen D Jermstad ◽  
Daniel L Bassoni ◽  
Keith S Jech ◽  
Gary A Ritchie ◽  
Nicholas C Wheeler ◽  
...  
Keyword(s):  
Quantitative Trait Loci ◽  
Quantitative Trait ◽  
Complex Traits ◽  
Moisture Stress ◽  
Interval Mapping ◽  
Douglas Fir ◽  
Adaptive Traits ◽  
Growth Cessation ◽  
Trait Loci ◽  
Growth Initiation

Abstract Quantitative trait loci (QTL) were mapped in the woody perennial Douglas fir (Pseudotsuga menziesii var. menziesii [Mirb.] Franco) for complex traits controlling the timing of growth initiation and growth cessation. QTL were estimated under controlled environmental conditions to identify QTL interactions with photoperiod, moisture stress, winter chilling, and spring temperatures. A three-generation mapping population of 460 cloned progeny was used for genetic mapping and phenotypic evaluations. An all-marker interval mapping method was used for scanning the genome for the presence of QTL and single-factor ANOVA was used for estimating QTL-by-environment interactions. A modest number of QTL were detected per trait, with individual QTL explaining up to 9.5% of the phenotypic variation. Two QTL-by-treatment interactions were found for growth initiation, whereas several QTL-by-treatment interactions were detected among growth cessation traits. This is the first report of QTL interactions with specific environmental signals in forest trees and will assist in the identification of candidate genes controlling these important adaptive traits in perennial plants.

Mapping of quantitative trait loci controlling adaptive traits in coastal Douglas-fir. I. Timing of vegetative bud flush

2001 ◽  
Vol 102 (8) ◽  
pp. 1142-1151 ◽  
Author(s):  
K. D. Jermstad ◽  
D. L. Bassoni ◽  
K. S. Jech ◽  
N. C. Wheeler ◽  
D. B. Neale
Keyword(s):  
Quantitative Trait Loci ◽  
Quantitative Trait ◽  
Douglas Fir ◽  
Adaptive Traits ◽  
Trait Loci ◽  
Vegetative Bud

scholarly journals Comparison of Quantitative Trait Loci for Adaptive Traits Between Oak and Chestnut Based on an Expressed Sequence Tag Consensus Map

Genetics ◽  
2005 ◽  
Vol 172 (1) ◽  
pp. 533-546 ◽  
Author(s):  
Manuela Casasoli ◽  
Jeremy Derory ◽  
Caroline Morera-Dutrey ◽  
Oliver Brendel ◽  
Ilga Porth ◽  
...  
Keyword(s):  
Quantitative Trait Loci ◽  
Quantitative Trait ◽  
Expressed Sequence Tag ◽  
Consensus Map ◽  
Adaptive Traits ◽  
Trait Loci ◽  
Expressed Sequence

scholarly journals Mapping Quantitative Trait Loci in the Woody Perennial Plant Genus Citrus

1995 ◽  
Author(s):  
Gloria A. Moore ◽  
Gozal Ben-Hayyim ◽  
Charles L. Guy ◽  
Doron Holland
Keyword(s):  
Molecular Markers ◽  
Quantitative Trait Loci ◽  
Linkage Map ◽  
Quantitative Trait ◽  
Cold Hardiness ◽  
Molecular Genetic ◽  
Citrus Fruit ◽  
Perennial Crop ◽  
Perennial Plant ◽  
Trait Loci

As is true for all crops, production of Citrus fruit is limited by traits whose characteristics are the products of many genes (i.e. cold hardiness). In order to modify these traits by marker aided selection or molecular genetic techniques, it is first necessary to map the relevant genes. Mapping of quantitative trait loci (QTLs) in perennial plants has been extremely difficult, requiring large numbers of mature plants. Production of suitable mapping populations has been inhibited by aspects of reproductive biology (e.g. incompatibility, apomixis) and delayed by juvenility. New approaches promise to overcome some of these obstacles. The overall objective of this project was to determine whether QTLs for environmental stress tolerance could be effectively mapped in the perennial crop Citrus, using an extensive linkage map consisting of various types of molecular markers. Specific objectives were to: 1) Produce a highly saturated genetic linkage map of Citrus by continuing to place molecular markers of several types on the map. 2) Exploiting recently developed technology and already characterized parental types, determine whether QTLs governing cold acclimation can be mapped using very young seedling populations. 3) Determine whether the same strategy can be transferred to a different situation by mapping QTLs influencing Na+ and C1- exclusion (likely components of salinity tolerance) in the already characterized cross and in new alternative crosses. 4) Construct a YAC library of the citrus genome for future mapping and cloning.

From genotype to phenotype: unraveling the complexities of cold adaptation in forest trees

2003 ◽  
Vol 81 (12) ◽  
pp. 1247-1266 ◽  
Author(s):  
Glenn T Howe ◽  
Sally N Aitken ◽  
David B Neale ◽  
Kathleen D Jermstad ◽  
Nicholas C Wheeler ◽  
...  
Keyword(s):  
Quantitative Trait Loci ◽  
Quantitative Trait ◽  
Cold Adaptation ◽  
Cold Hardiness ◽  
Evolutionary Ecology ◽  
Genetic Correlations ◽  
Analytical Techniques ◽  
Future Research ◽  
Trait Loci ◽  
Bud Phenology

Adaptation to winter cold in temperate and boreal trees involves complex genetic, physiological, and developmental processes. Genecological studies demonstrate the existence of steep genetic clines for cold adaptation traits in relation to environmental (mostly temperature related) gradients. Population differentiation is generally stronger for cold adaptation traits than for other quantitative traits and allozymes. Therefore, these traits appear to be under strong natural selection. Nonetheless, high levels of genetic variation persist within populations. The genetic control of cold adaptation traits ranges from weak to strong, with phenological traits having the highest heritabilities. Within-population genetic correlations among traits range from negligible to moderate. Generally, bud phenology and cold hardiness in the fall are genetically uncorrelated with bud phenology and cold hardiness in the spring. Analyses of quantitative trait loci indicate that cold adaptation traits are mostly controlled by multiple genes with small effects and that quantitative trait loci × environment interactions are common. Given this inherent complexity, we suggest that future research should focus on identifying and developing markers for cold adaptation candidate genes, then using multilocus, multi allelic analytical techniques to uncover the relationships between genotype and phenotype at both the individual and population levels. Ultimately, these methods may be useful for predicting the performance of genotypes in breeding programs and for better understanding the evolutionary ecology of forest trees.Key words: association genetics, cold hardiness, dormancy, genecology, bud phenology, quantitative trait loci.

Identification of cis-regulated genes in quantitative trait loci driving liver fibrosis

2012 ◽  
Vol 50 (08) ◽  
Author(s):  
R Hall ◽  
R Müllenbach ◽  
S Huss ◽  
R Alberts ◽  
K Schughart ◽  
...  
Keyword(s):  
Quantitative Trait Loci ◽  
Liver Fibrosis ◽  
Quantitative Trait ◽  
Trait Loci
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