Polygenic adaptation and negative selection across traits, years and environments in a long-lived plant species (Pinus pinaster Ait., Pinaceae)
Por:
de Miguel, Marina, Rodriguez-Quilon, Isabel, Heuertz, Myriam, Hurel, Agathe, Grivet, Delphine, Pablo Jaramillo-Correa, Juan, Vendramin, Giovanni G., Plomion, Christophe, Majada, Juan, Alia, Ricardo, Eckert, Andrew J., Gonzalez-Martinez, Santiago C.
Publicada:
1 abr 2022
Resumen:
A decade of genetic association studies in multiple organisms suggests
that most complex traits are polygenic; that is, they have a genetic
architecture determined by numerous loci, each with small effect-size.
Thus, determining the degree of polygenicity and its variation across
traits, environments and time is crucial to understand the genetic basis
of phenotypic variation. We applied multilocus approaches to estimate
the degree of polygenicity of fitness-related traits in a long-lived
plant (Pinus pinaster Ait., maritime pine) and to analyse this variation
across environments and years. We evaluated five categories of
fitness-related traits (survival, height, phenology, functional, and
biotic-stress response) in a clonal common-garden network planted in
contrasted environments (over 20,500 trees). Most of the analysed traits
showed evidence of local adaptation based on Q(st)-F-st comparisons. We
further observed a remarkably stable degree of polygenicity, averaging
6% (range of 0%-27%), across traits, environments and years. We
detected evidence of negative selection, which could explain, at least
partially, the high degree of polygenicity. Because polygenic adaptation
can occur rapidly, our results suggest that current predictions on the
capacity of natural forest tree populations to adapt to new environments
should be revised, especially in the current context of climate change.
Filiaciones:
de Miguel, Marina:
Univ Bordeaux, BIOGECO, INRAE, Cestas, France
Univ Bordeaux, INRAE, Bordeaux Sci Agro, EGFV, Villenave Dornon, France
Rodriguez-Quilon, Isabel:
INIA, Dept Forest Ecol & Genet, Forest Res Ctr, Madrid, Spain
Heuertz, Myriam:
Univ Bordeaux, BIOGECO, INRAE, Cestas, France
Hurel, Agathe:
Univ Bordeaux, BIOGECO, INRAE, Cestas, France
Grivet, Delphine:
INIA, Dept Forest Ecol & Genet, Forest Res Ctr, Madrid, Spain
Pablo Jaramillo-Correa, Juan:
Univ Nacl Autonoma Mexico, Inst Ecol, Dept Evolutionary Ecol, Mexico City, DF, Mexico
Vendramin, Giovanni G.:
Inst Biosci & Bioresources, Natl Res Council, Div Florence, Sesto Fiorentino, Italy
Plomion, Christophe:
Univ Bordeaux, BIOGECO, INRAE, Cestas, France
Majada, Juan:
SERIDA, Secc Forestal, Grado, Spain
Alia, Ricardo:
INIA, Dept Forest Ecol & Genet, Forest Res Ctr, Madrid, Spain
Eckert, Andrew J.:
Virginia Commonwealth Univ, Dept Biol, Richmond, VA 23284 USA
Gonzalez-Martinez, Santiago C.:
Univ Bordeaux, BIOGECO, INRAE, Cestas, France
Green Submitted
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