Asymmetrical gene flow in a hybrid zone of Hawaiian Schiedea (Caryophyllaceae) species with contrasting mating systems
| Autor: | Stephen G. Weller, Theresa M. Culley, Ashley Kuenzi, Ann K. Sakai, Warren L. Wagner, Tilottama Roy, Lisa E. Wallace, Molly Nepokroeff |
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| Rok vydání: | 2011 |
| Předmět: |
0106 biological sciences
Chloroplasts Plant Evolution wind pollination lcsh:Medicine Population genetics Caryophyllaceae Plant Science Plant Genetics 01 natural sciences Gene flow mitochondrial-dna Medicine and Health Sciences Plant Genomics lcsh:Science 0303 health sciences education.field_of_study Principal Component Analysis Multidisciplinary biology Geography Ecology Reproduction food and beverages salicaria caryophyllaceae silversword alliance Anemophily adaptive radiation Research Article gynodioecious plant Gene Flow Genetic Markers Evolutionary Processes natural-populations Population interspecific hybridization 010603 evolutionary biology Hawaii 03 medical and health sciences Hybrid zone Quantitative Trait Heritable Species Specificity Botany Genetics education Biology Hybridization 030304 developmental biology Hybrid Cell Nucleus Evolutionary Biology phylogenetic analysis Plant Ecology lcsh:R Selfing Genetic Variation biology.organism_classification Organismal Evolution Agronomy Plant Breeding Haplotypes Genetic Loci Hybridization Genetic lcsh:Q Schiedea Population Genetics inbreeding depression Microsatellite Repeats |
| Zdroj: | PLoS ONE Wallace, Lisa E.; Culley, Theresa M.; Weller, Stephen G.; Sakai, Ann K.; Kuenzi, Ashley; Roy, Tilottama; et al.(2011). Asymmetrical Gene Flow in a Hybrid Zone of Hawaiian Schiedea (Caryophyllaceae) Species with Contrasting Mating Systems. PLoS ONE, 6(9), e24845. UC Irvine: Retrieved from: http://www.escholarship.org/uc/item/56s950cx PLoS ONE, Vol 6, Iss 9, p e24845 (2011) |
| ISSN: | 1932-6203 |
| Popis: | Asymmetrical gene flow, which has frequently been documented in naturally occurring hybrid zones, can result from various genetic and demographic factors. Understanding these factors is important for determining the ecological conditions that permitted hybridization and the evolutionary potential inherent in hybrids. Here, we characterized morphological, nuclear, and chloroplast variation in a putative hybrid zone between Schiedea menziesii and S. salicaria, endemic Hawaiian species with contrasting breeding systems. Schiedea menziesii is hermaphroditic with moderate selfing; S. salicaria is gynodioecious and wind-pollinated, with partially selfing hermaphrodites and largely outcrossed females. We tested three hypotheses: 1) putative hybrids were derived from natural crosses between S. menziesii and S. salicaria, 2) gene flow via pollen is unidirectional from S. salicaria to S. menziesii and 3) in the hybrid zone, traits associated with wind pollination would be favored as a result of pollen-swamping by S. salicaria. Schiedea menziesii and S. salicaria have distinct morphologies and chloroplast genomes but are less differentiated at the nuclear loci. Hybrids are most similar to S. menziesii at chloroplast loci, exhibit nuclear allele frequencies in common with both parental species, and resemble S. salicaria in pollen production and pollen size, traits important to wind pollination. Additionally, unlike S. menziesii, the hybrid zone contains many females, suggesting that the nuclear gene responsible for male sterility in S. salicaria has been transferred to hybrid plants. Continued selection of nuclear genes in the hybrid zone may result in a population that resembles S. salicaria, but retains chloroplast lineage(s) of S. menziesii. |
| Databáze: | OpenAIRE |
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