PHYLOGEOGRAPHIC STRUCTURE OF CRESCENTIA ALATA (BIGNONIACEAE): HOMEGARDENS AS RESERVOIRS OF LOCAL DIVERSITY
Por:
Aguirre-Dugua, Xitlali, Casas, Alejandro, Ramirez-Barahona, Santiago, Perez-Negron, Edgar
Publicada:
1 ene 2023
Categoría:
Plant science
Resumen:
Background: Human management of plant populations can modify the amounts
and distribution of their genetic diversity.
Questions: What is the phylogeographic structure of Crescentia alata and
how is it related to past climatic changes? What are the genetic
diversity levels of homegarden populations and how are they associated
to human management?
Studied species: Crescentia alata Kunth (Bignoniaceae).
Study site and dates: Mexico and Central America 2009-2011.
Methods: We analyzed 243 trees from 10 homegarden and 25 wild
populations. Chloroplast haplotypes were identified through six
microsatellite loci. Haplotype relationships were reconstructed with a
median-joining network. Genetic diversity and structuring were evaluated
with R-ST and G(ST) indexes and AMOVA. Geographical barriers among
populations were identified with Monmonier's algorithm. The hypothesis
of historical demographic growth was evaluated through the paired
differences distribution and the species potential distribution was
projected onto the past during the Middle Holocene, Last Glacial Maximum
and Last Inter Glacial periods.
Results: A latitudinal pattern of phylogeographic structure was
identified with geographical barriers in the northern Pacific Ocean and
the Tehuantepec Isthmus. We detected a significant demographic growth,
likely associated to glacial environmental conditions. Most homegarden
trees were found to be tolerated and share chloroplast haplotypes with
sympatric wild populations.
Conclusions: Human management has not modified the natural
phylogeographic structure of C. alata and homegarden populations
represent a genetic reservoir where introgression processes are favored
by seed mediated propagation.
Filiaciones:
Aguirre-Dugua, Xitlali:
Colegio Postgrad, Bot, Campus Montecillo, Montecillo, Estado De Mexic, Mexico
Casas, Alejandro:
Univ Nacl Autonoma Mexico, Inst Invest Ecosistemas & Sustentabilidad, Campus Morelia, Morelia, Michoacan, Mexico
Ramirez-Barahona, Santiago:
Univ Nacl Autonoma Mexico, Inst Biol, Dept Bot, Ciudad De Mexico, Mexico
Perez-Negron, Edgar:
Univ Nacl Autonoma Mexico, Inst Invest Ecosistemas & Sustentabilidad, Campus Morelia, Morelia, Michoacan, Mexico
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