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Deciphering Hybrid Larch Reaction Norms Using Random Regression.

Alexandre Marchal1, Carl D Schlichting2, Rémy Gobin1

  • 1INRA, Research Unit on Forest Breeding, Genetics and Physiology (UR 0588 AGPF), Centre de recherche Val-de-Loire, 45075 Ardon, France.

G3 (Bethesda, Md.)
|October 19, 2018
PubMed
Summary
This summary is machine-generated.

Hybrid larch exhibits significant phenotypic plasticity, with its superior growth linked to water availability. This study reveals how plasticity influences heterosis and genetic parameters in hybrid trees.

Keywords:
phenotypic plasticity heterosis tree rings traits soil water availability multi-trait model

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Area of Science:

  • Forestry
  • Plant Breeding
  • Ecology

Background:

  • Phenotypic plasticity and heterosis are crucial for breeding, but their link remains unclear.
  • Wood growth rings offer a record of tree responses to environmental changes.
  • Understanding these relationships is vital for improving tree breeding strategies.

Purpose of the Study:

  • To evaluate the relationship between phenotypic plasticity and heterosis in hybrid larch (Larix decidua × L. kaempferi).
  • To model the reaction norms of wood traits (ring width, density) in relation to soil water availability.
  • To investigate the influence of plasticity on quantitative genetic parameters in hybrid larch.

Main Methods:

  • Analysis of temporal wood ring traits (width, density) from hybrid larch and parent species.
  • Utilized random regression to estimate reaction norms concerning water availability.
  • Employed a diallel mating design across two contrasting French sites.

Main Results:

  • Confirmed ring width plasticity across all tested larch taxa in response to water availability.
  • Hybrid larch demonstrated the highest plasticity, with its superiority increasing under higher water availability.
  • A negative correlation between traits was observed, contingent on water availability, despite low heritability.

Conclusions:

  • Phenotypic plasticity plays a significant role in the expression of heterosis in hybrid larch.
  • Random regression is an effective tool for modeling reaction norms, particularly for perennial species.
  • Findings provide insights for optimizing breeding programs for hybrid trees in varying environments.