Genomic and chemical evidence for local adaptation in resistance to different herbivores inDatura stramonium
Por:
De-la-Cruz, Ivan M., Merila, Juha, Valverde, Pedro L., Flores-Ortiz, Cesar M., Nunez-Farfan, Juan
Publicada:
1 dic 2020
Resumen:
Because most species are collections of genetically variable populations
distributed to habitats differing in their abiotic/biotic environmental
factors and community composition, the pattern and strength of natural
selection imposed by species on each other's traits are also expected to
be highly spatially variable. Here, we used genomic and quantitative
genetic approaches to understand how spatially variable selection
operates on the genetic basis of plant defenses to herbivores. To this
end, an F(2)progeny was generated by crossingDatura
stramonium(Solanaceae) parents from two populations differing in their
level of chemical defense. This F(2)progeny was reciprocally
transplanted into the parental plants' habitats and by measuring the
identity by descent (IBD) relationship of each F(2)plant to each parent,
we were able to elucidate how spatially variable selection imposed by
herbivores operated on the genetic background (IBD) of resistance to
herbivory, promoting local adaptation. The results highlight that plants
possessing the highest total alkaloid concentrations (sum of all
alkaloid classes) were not the most well-defended or fit. Instead,
specific alkaloids and their linked loci/alleles were favored by
selection imposed by different herbivores. This has led to population
differentiation in plant defenses and thus, to local adaptation driven
by plant-herbivore interactions.
Filiaciones:
De-la-Cruz, Ivan M.:
Univ Nacl Autonoma Mexico, Inst Ecol, Dept Evolutionary Ecol, Lab Ecol Genet & Evolut, Mexico City, DF, Mexico
Univ Helsinki, Ecol Genet Res Unit, Organismal & Evolutionary Biol Res Program, Fac Biol & Environm Sci, Helsinki, Finland
Merila, Juha:
Univ Helsinki, Ecol Genet Res Unit, Organismal & Evolutionary Biol Res Program, Fac Biol & Environm Sci, Helsinki, Finland
Valverde, Pedro L.:
Univ Autonoma Metropolitana, Dept Biol, Campus Iztapalapa, Mexico City, DF, Mexico
Flores-Ortiz, Cesar M.:
Univ Nacl Autonoma Mexico, Fac Estudios Super Iztacala, Mexico City, DF, Mexico
Nunez-Farfan, Juan:
Univ Nacl Autonoma Mexico, Inst Ecol, Dept Evolutionary Ecol, Lab Ecol Genet & Evolut, Mexico City, DF, Mexico
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