Genetic structure in Louisiana Iris species reveals patterns of recent and historical admixture
| Autor: | Noland H. Martin, V. Alex Sotola, Chris C. Nice, Alexander S. Zalmat |
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| Rok vydání: | 2021 |
| Předmět: |
Species complex
education.field_of_study Reproductive Isolation Genetic Speciation Genetic Structures Iris Plant Population Plant Science Biology biology.organism_classification Louisiana Texas Hybrid zone Evolutionary biology Louisiana iris Genetic structure Genetics Hybridization Genetic education Iris hexagona Iris fulva Ecology Evolution Behavior and Systematics Iris brevicaulis |
| Zdroj: | American journal of botanyREFERENCES. 108(11) |
| ISSN: | 1537-2197 |
| Popis: | PREMISE When divergent lineages come into secondary contact, reproductive isolation may be incomplete, thus providing an opportunity to investigate how speciation is manifested in the genome. The Louisiana Irises (Iris, series Hexagonae) comprise a group of three or more ecologically and reproductively divergent lineages that can produce hybrids where they come into contact. We estimated standing genetic variation to understand the current distribution of population structure in the Louisiana Irises. METHODS We used genotyping-by-sequencing techniques to sample the genomes of Louisiana Iris species across their ranges. We sampled 20 populations (n = 632 individuals) across 11,249 loci and used Entropy and PCA models to assess population genetic data. RESULTS We discovered evidence for interspecific gene flow in parts of the range. Our analysis revealed patterns of population structure at odds with widely accepted nominal taxonomy. We discovered undescribed hybrid populations, designated as belonging to the I. brevicaulis lineage. Iris nelsonii shared significant ancestry with only one of the purported parent species, I. fulva, evidence inconsistent with a hybrid origin. CONCLUSIONS This study provides several key findings important to the investigation of standing genetic variation in the Louisiana Iris species complex. Compared to the other nominal species, I. brevicaulis contains a large amount of genetic diversity. In addition, we discovered a previously unknown hybrid zone between I. brevicaulis and I. hexagona along the Texas coast. Finally, our results do not support the long-standing hypothesis that I. nelsonii has mixed ancestry from three parental taxa. |
| Databáze: | OpenAIRE |
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