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Population divergence along a genetic line of least resistance in the tree species Eucalyptus globulus
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Orientador(es)
Resumo(s)
The evolutionary response to selection depends on the distribution of genetic variation
in traits under selection within populations, as defined by the additive genetic variance-covariance
matrix (G). The structure and evolutionary stability of G will thus influence the course of phenotypic
evolution. However, there are few studies assessing the stability of G and its relationship with
population divergence within foundation tree species. We compared the G-matrices of Mainland and
Island population groups of the forest tree Eucalyptus globulus, and determined the extent to which
population divergence aligned with within-population genetic (co)variation. Four key wood property
traits exhibiting signals of divergent selection were studied—wood density, extractive content,
and lignin content and composition. The comparison of G-matrices of the mainland and island
populations indicated that the G-eigenstructure was relatively well preserved at an intra-specific level.
Population divergence tended to occur along a major direction of genetic variation in G. The observed
conservatism of G, the moderate evolutionary timescale, and close relationship between genetic
architecture and population trajectories suggest that genetic constraints may have influenced the
evolution and diversification of the E. globulus populations for the traits studied. However, alternative
scenarios, including selection aligning genetic architecture and population divergence, are discussed
Descrição
Palavras-chave
additive genetic variance-covariance matrix evolvability response to selection genetic constraint genetic line of least resistance quantitative genetics wood properties Eucalyptus globulus
Contexto Educativo
Citação
Genes 2020, 11, 1095
Editora
MDPI