Developmental factors responsible for heterosis in aspen hybrids (Populus tremuloides x P. tremula)

Bailian Li, Glenn T. Howe, Rongling Wu

Research output: Contribution to journalArticle

39 Citations (Scopus)

Abstract

Juvenile growth and bud set phenology were analyzed to study the biological basis of heterosis (hybrid vigor) in interspecific hybrids of Populus tremuloides Michx. (T) and P. tremula L. (Ta). Growth, measured as seedling volume index, was significantly higher for each of the two reciprocal interspecific crosses, T x Ta and Ta x T, than for the T x T intraspecific cross. Broad-sense heritabilities were 2-6 times larger than narrow-sense heritabilities for growth and shoot components in the T x T intraspecific cross, suggesting an important role for dominance or overdominance in aspen growth. Previous genetic analyses have indicated that hybrid vigor may be the result of overdominance at several key loci each with an allele inherited from each of parental species. Internode length and leaf number contributed substantially to the heterosis of stem volume, but their effects on heterosis differed between the T x Ta and Ta x T hybrids. In T x Ta seedlings, heterosis of stem volume was attributed to a high diameter growth rate, whereas in Ta x T seedlings heterosis of stem volume was probably the result of delayed bud set resulting in a longer duration of height growth. In addition to internode number and length and leaf number, other morphological or physiological components might affect heterosis, for example, extended leaf retention.

Original languageEnglish (US)
Pages (from-to)29-36
Number of pages8
JournalTree Physiology
Volume18
Issue number1
DOIs
StatePublished - Jan 1998

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Hybrid Vigor
Populus
Populus tremula
Populus tremuloides
heterosis
Growth
Seedlings
overdominance
internodes
stems
seedlings
heritability
buds
leaves
dominance (genetics)
phenology
Alleles
alleles
loci
shoots

All Science Journal Classification (ASJC) codes

  • Physiology
  • Plant Science

Cite this

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abstract = "Juvenile growth and bud set phenology were analyzed to study the biological basis of heterosis (hybrid vigor) in interspecific hybrids of Populus tremuloides Michx. (T) and P. tremula L. (Ta). Growth, measured as seedling volume index, was significantly higher for each of the two reciprocal interspecific crosses, T x Ta and Ta x T, than for the T x T intraspecific cross. Broad-sense heritabilities were 2-6 times larger than narrow-sense heritabilities for growth and shoot components in the T x T intraspecific cross, suggesting an important role for dominance or overdominance in aspen growth. Previous genetic analyses have indicated that hybrid vigor may be the result of overdominance at several key loci each with an allele inherited from each of parental species. Internode length and leaf number contributed substantially to the heterosis of stem volume, but their effects on heterosis differed between the T x Ta and Ta x T hybrids. In T x Ta seedlings, heterosis of stem volume was attributed to a high diameter growth rate, whereas in Ta x T seedlings heterosis of stem volume was probably the result of delayed bud set resulting in a longer duration of height growth. In addition to internode number and length and leaf number, other morphological or physiological components might affect heterosis, for example, extended leaf retention.",
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Developmental factors responsible for heterosis in aspen hybrids (Populus tremuloides x P. tremula). / Li, Bailian; Howe, Glenn T.; Wu, Rongling.

In: Tree Physiology, Vol. 18, No. 1, 01.1998, p. 29-36.

Research output: Contribution to journalArticle

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