Genetic causes of heterosis in juvenile aspen

A quantitative comparison across intra- and inter-specific hybrids

Research output: Contribution to journalArticle

44 Citations (Scopus)

Abstract

The genetic causes of heterosis in tree growth were investigated by a comparative genetic analysis of intra- and inter-specific crosses derived from Populus tremuloides and P. tremula. A new analytical method was developed to estimate the effective number of loci affecting a quantitative trait and the magnitudes of their additive and dominant effects across loci. The method combines the assumption of multiple alleles, us frequently found in outcrossing species, and the family structure analysis at different hierarchical levels. During the first 3 years of growth, interspecific hybrids displayed strong heterosis in stem growth, especially volume index, over intraspecific hybrids. By a series of joint analyses on the combining ability and the genetic component, we found that F1 heterosis might be due to overdominant interaction between two alleles, one from the P. tremuloides parent and the other from the P. tremula parent, at the same loci. This inference was derived from the finding that heterozygotes, newly formed through species combination, showed much greater growth than the heterozygotes from intraspecifc crosses at a reference locus. Heterosis in aspen growth appeared to be under multigenie control, with a slightly larger number of loci for stem diameter and volume (9 10) than for height (6 8). For traits with non-significant heterosis, such as stem allometry and internode number and length, the number of underlying loci seemed to be much fewer (3 4). While additive effects appeared to influence seedling traits collectively across loci, a few major dominant loci had much larger effects on stem growth.

Original languageEnglish (US)
Pages (from-to)380-391
Number of pages12
JournalTheoretical and Applied Genetics
Volume93
Issue number3
DOIs
StatePublished - Jan 1 1996

Fingerprint

Hybrid Vigor
heterosis
loci
Growth
Heterozygote
Populus tremuloides
stem elongation
Alleles
heterozygosity
Populus
alleles
family structure
Populus tremula
stems
Seedlings
allometry
outcrossing
additive effect
internodes
tree growth

All Science Journal Classification (ASJC) codes

  • Biotechnology
  • Agronomy and Crop Science
  • Genetics

Cite this

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abstract = "The genetic causes of heterosis in tree growth were investigated by a comparative genetic analysis of intra- and inter-specific crosses derived from Populus tremuloides and P. tremula. A new analytical method was developed to estimate the effective number of loci affecting a quantitative trait and the magnitudes of their additive and dominant effects across loci. The method combines the assumption of multiple alleles, us frequently found in outcrossing species, and the family structure analysis at different hierarchical levels. During the first 3 years of growth, interspecific hybrids displayed strong heterosis in stem growth, especially volume index, over intraspecific hybrids. By a series of joint analyses on the combining ability and the genetic component, we found that F1 heterosis might be due to overdominant interaction between two alleles, one from the P. tremuloides parent and the other from the P. tremula parent, at the same loci. This inference was derived from the finding that heterozygotes, newly formed through species combination, showed much greater growth than the heterozygotes from intraspecifc crosses at a reference locus. Heterosis in aspen growth appeared to be under multigenie control, with a slightly larger number of loci for stem diameter and volume (9 10) than for height (6 8). For traits with non-significant heterosis, such as stem allometry and internode number and length, the number of underlying loci seemed to be much fewer (3 4). While additive effects appeared to influence seedling traits collectively across loci, a few major dominant loci had much larger effects on stem growth.",
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Genetic causes of heterosis in juvenile aspen : A quantitative comparison across intra- and inter-specific hybrids. / Li, B.; Wu, Rongling.

In: Theoretical and Applied Genetics, Vol. 93, No. 3, 01.01.1996, p. 380-391.

Research output: Contribution to journalArticle

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