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Molecular characterization and genetic diversity of Jatropha curcas L. in Costa Rica

We estimated the genetic diversity of 50 Jatropha curcas samples from the Costa Rican germplasm bank using 18 EST-SSR, one G-SSR and nrDNA-ITS markers. We also evaluated the phylogenetic relationships among samples using nuclear ribosomal ITS markers. Non-toxicity was evaluated using G-SSRs and S...

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Autores Principales: Vásquez-Mayorga, Marcela, Fuchs, Eric, Hernández, Eduardo, Herrera, Franklin, Hernández, Jesús, Moreira-González, Ileana, Arnáez-Serrano, Elizabeth, Barboza, Natalia
Formato: Artículo
Idioma: Español
Publicado: 2017
Materias:
Diversidad genética
Filogenética
Toxicidad
Jatropha curcas
Genes
Research Subject Categories::NATURAL SCIENCES::Biology::Cell and molecular biology::Molecular biology
Marcadores > EST-SSR > G-SSR > nrDNA-ITS
Genetic diversity
Phylogenetics
Toxicity
Markers > EST-SSR > G-SSR > nrDNA-ITS
Marcadores G-SSR > SCAR
Markers > G-SSR > SCAR
Acceso en línea: https://peerj.com/articles/2931/
https://hdl.handle.net/2238/7095
Sumario: We estimated the genetic diversity of 50 Jatropha curcas samples from the Costa Rican germplasm bank using 18 EST-SSR, one G-SSR and nrDNA-ITS markers. We also evaluated the phylogenetic relationships among samples using nuclear ribosomal ITS markers. Non-toxicity was evaluated using G-SSRs and SCARs markers. A Neighbor- Joining (NJ) tree and a Maximum Likelihood (ML) tree were constructed using SSR markers and ITS sequences, respectively. Heterozygosity was moderate (He D 0.346), but considerable compared to worldwide values for J. curcas. The PIC (PIC D 0.274) and inbreeding coefficient (f D􀀀0:102) were both low. Clustering was not related to the geographical origin of accessions. International accessions clustered independently of collection sites, suggesting a lack of genetic structure, probably due to the wide distribution of this crop and ample gene flow. Molecular markers identified only one non-toxic accession (JCCR-24) from Mexico. This work is part of a countrywide effort to characterize the genetic diversity of the Jatropha curcas germplasm bank in Costa Rica.

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