Genetic drift and uniform selection shape evolution of most traits in Eugenia dysenterica DC. (Myrtaceae)

被引:14
|
作者
Boaventura-Novaes, Carolina R. D. [1 ]
Novaes, Evandro [1 ,2 ]
Mota, Elias E. S. [1 ]
Telles, Mariana P. C. [3 ,4 ]
Coelho, Alexandre S. G. [1 ]
Chaves, Lazaro J. [1 ]
机构
[1] Univ Fed Goias, Escola Agron, Setor Melhoramento Plantas, BR-74001970 Goiania, Go, Brazil
[2] Univ Fed Lavras, Dept Biol, BR-37200000 Lavras, MG, Brazil
[3] Univ Fed Goias, Inst Ciencias Biol, Lab Genet & Biodiversidade, BR-74001970 Goiania, Go, Brazil
[4] Pontificia Univ Catolica Goias, Escola Ciencias Agr & Biol, BR-74605010 Goiania, Go, Brazil
关键词
Cagaita tree; Cerrado; Genetic divergence; Q(ST); F-ST; PHENOTYPIC PLASTICITY; Q(ST)-F-ST COMPARISONS; POPULATION-STRUCTURE; QUANTITATIVE TRAITS; LOCAL ADAPTATION; CLIMATE-CHANGE; SAVANNA TREE; F-ST; DIFFERENTIATION; CONSERVATION;
D O I
10.1007/s11295-018-1289-2
中图分类号
S7 [林业];
学科分类号
0829 ; 0907 ;
摘要
Knowing how microevolutionary processes, such as genetic drift and natural selection, shape variation in adaptive traits is strategic for conservation measures. One way to estimate local adaptation is to compare divergences in quantitative traits (Q(ST)) and neutral loci (F-ST). Therefore, we have assessed the pattern of phenotypic and molecular genetic divergence among natural subpopulations of the fruit tree Eugenia dysenterica DC. A provenance and progeny test was performed to assess the quantitative traits of the subpopulations collected in a wide distribution area of the species in the Brazilian Cerrado. The sampled environments are in a biodiversity hotspot with heterogeneous soil and climate conditions. By associating quantitative trait variation in initial seedling development with neutral microsatellite marker variation, we tested the local adaptation of the traits by the Q(ST)-F-ST contrast. Genetic drift was prevalent in the phenotypic differentiation among the subpopulations, although the traits seedling emergence time and root green mass, which are relevant for adaptation to the Cerrado climate, showed signs of uniform selection. Our results suggest that E. dysenterica has a spatial genetic structure divided into two large groups, separated by a line that divides the Cerrado biome in a southwestern to northeastern direction. This structure must be taken into account for managing E. dysenterica genetic resources both for conservation and breeding purposes.
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页数:14
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