Molecular genetics of growth and development in populus. IV. Mapping QTLs with large effects on growth, form, and phenology traits in a forest tree

We have mapped quantitative trait loci (QTLs) for commercially important traits (stem growth and form) and an adaptive trait (spring leaf flush) in a Populus F2 generation derived from a cross between interspecific F1 hybrids (P. trichocarpa X P. deltoides). Phenotypic data were collected over a 2-y...

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Bibliographic Details
Published in:Genetics (Austin) 1995-02, Vol.139 (2), p.963-973
Main Authors: Bradshaw, H.D. Jr. (University of Washington, Seattle, WA.), Stettler, R.F
Format: Article
Language:English
Subjects:
ANALISIS CUANTITATIVO
ANALYSE QUANTITATIVE
Botany
Chromosome Mapping
CRECIMIENTO
CROISSANCE
Crosses, Genetic
FENOLOGIA
FEUILLE
GENE
GENES
Genetic Linkage
Genetic Markers
Genetic Variation - physiology
GENETICA
Genetics
GENETIQUE
HABITOS DE CRECIMIENTO
HEREDITE
HERENCIA GENETICA
HOJAS
Hybrid Vigor - genetics
Investigations
LOCI
LOCUS
PARAMETRE GENETIQUE
PARAMETROS GENETICOS
PHENOLOGIE
Phenotype
Plant Leaves - growth & development
Plant Stems - growth & development
POPULUS
POPULUS DELTOIDES
POPULUS TRICHOCARPA
PORT DE LA PLANTE
SUPERFICIE FOLIAR
SURFACE FOLIAIRE
TALLO
TIGE
Trees
Trees - genetics
Trees - growth & development
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Summary:We have mapped quantitative trait loci (QTLs) for commercially important traits (stem growth and form) and an adaptive trait (spring leaf flush) in a Populus F2 generation derived from a cross between interspecific F1 hybrids (P. trichocarpa X P. deltoides). Phenotypic data were collected over a 2-year period from a replicated clonal trial containing ramets of the parental, F1, and F2 trees. Contrary to the assumptions of simple polygenic models of quantitative trait inheritance, 1-5 QTLs of large effect are responsible for a large portion of the genetic variance in each of the traits measured. For example, 44.7% of the genetic variance in stem volume after 2 years of growth is controlled by just two QTLs. QTLs governing stem basal area were found clustered with QTLs for sylleptic branch leaf area, sharing similar chromosomal position and mode of action and suggesting a pleiotropic effect of QTLs ultimately responsible for stem diameter growth
ISSN:0016-6731
1943-2631
1943-2631
DOI:10.1093/genetics/139.2.963