Please use this identifier to cite or link to this item: http://cicy.repositorioinstitucional.mx/jspui/handle/1003/2675
Consequences of introgression and gene flow on the genetic structure and diversity of Lima bean (Phaseolus lunatus L.) in its Mesoamerican diversity area
Mauricio Heredia Pech
MARIANA CHAVEZ PESQUEIRA
MATILDE MARGARITA ORTIZ GARCIA
RUBEN HUMBERTO ANDUEZA NOH
MARÍA ISABEL CHACÓN SÁNCHEZ
JAIME MARTINEZ CASTILLO
Acceso Abierto
Atribución-NoComercial-SinDerivadas
doi: 10.7717/peerj.13690
SNPS MARKERS
MAYAN MILPA
YUCATAN PENINSULA
WILD-WEEDY-CROP COMPLEXES
WILD-CROP INTROGRESSION
We evaluated the role of gene flow and wild-crop introgression on the structure and genetic diversity of Lima bean (Phaseolus lunatus) in the Yucatan Peninsula, an important Mesoamerican diversity area for this crop, using a genotyping-by-sequencing approach (15,168 SNP markers) and two scales. At the local scale, STRUCTURE and NGSEP analyses showed predominantly crop-to-wild introgression, but also evidence of a bidirectional gene flow in the two wild-weedy-crop complexes studied (Itzinté and Dzitnup). The ABBA-BABA tests showed a higher introgression in Itzinté (the older complex) than in Dzitnup (the younger one); at the allelic level, the wild-crop introgression in Itzinté was similar in both directions, in Dzitnup it was higher from crop-to-wild; and at the chromosomal level, introgression in Itzinté was from wild-to-crop, whereas in Dzitnup it occured in the opposite direction. Also, we found HE values slightly higher in the domesticated accessions than in the wild ones, in both complexes (Itzinté: wild = 0.31, domesticated = 0.34; Dzinup: wild = 0.27, domesticated = 0.36), but %P and π estimators were higher in the wild accessions than in the domesticated ones. At a regional scale, STRUCTURE and MIGRATE showed a low gene flow, predominantly from crop-to-wild; and STRUCTURE, Neighbor-Joining and PCoA analyses indicated the existence of two wild groups and one domesticated group, with a marked genetic structure based in the existence of domesticated MI and wild MII gene pools. Also, at the regional scale, we found a higher genetic diversity in the wild accessions than in the domesticated ones, in all estimators used (e.g., HE = 0.27 and HE = 0.17, respectively). Our results indicate that gene flow and introgression are playing an important role at the local scale, but its consequences on the structure and genetic diversity of the Lima bean are not clearly reflected at the regional scale, where diversity patterns between wild and domesticated populations could be reflecting historical events. Copyright 2022 Heredia-Pech et al.
2022
Artículo
PeerJ, 10, e13690, 2022.
Inglés
Heredia-Pech, M., Chávez-Pesqueira, M., Ortiz-García, M. M., Andueza-Noh, R. H., Chacón-Sánchez, M. I., & Martínez-Castillo, J. (2022). Consequences of introgression and gene flow on the genetic structure and diversity of Lima bean (Phaseolus lunatus L.) in its Mesoamerican diversity area. PeerJ, 10, e13690.
DESARROLLO VEGETAL
Versión publicada
publishedVersion - Versión publicada
Appears in Collections:Artículos de Investigación Arbitrados

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