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Exploring species limits in two closely related Chinese oaks
Yan-Fei Zeng1, Wan-Jin Liao, Rémy J Petit
1Key Laboratory of Silviculture of the State Forestry Administration, Research Institute of Forestry, Chinese Academy of Forestry, Beijing, China.
Plos One
|December 15, 2010
Summary
Two Chinese oak species, Quercus liaotungensis and Q. mongolica, are distinct taxonomic units. Genetic analysis reveals significant differentiation, though some hybridization occurs in contact zones.
Area of Science:
- Botany
- Genetics
- Evolutionary Biology
Background:
- The species status of closely related Chinese oaks, Quercus liaotungensis and Quercus mongolica, is uncertain.
- Investigating their distinctness and hybridization is crucial for understanding oak evolution in China.
Purpose of the Study:
- To clarify the species status of Quercus liaotungensis and Quercus mongolica.
- To quantify the extent of introgression between these two oak taxa.
Main Methods:
- Utilized SSR (simple sequence repeat) and AFLP (amplified fragment length polymorphism) markers for genetic analysis.
- Employed Bayesian clustering, principal coordinate analysis, and population genetic distance trees.
- Conducted interspecific FST simulation analysis to identify loci under divergent selection.
Main Results:
- Significant interspecific genetic differentiation was observed, exceeding within-taxa variation.
- Genetic analyses consistently grouped individuals according to species, aligning with morphological differences, not geography.
- Evidence of hybrid ancestry was found in some individuals from Northeast and North China.
- Specific SSR and AFLP markers indicated potential divergent selection between the species.
Conclusions:
- Quercus liaotungensis and Quercus mongolica represent distinct genetic lineages in most sympatric areas.
- These oaks should be recognized as separate taxonomic units.
- Introgression levels vary across contact zones, potentially influenced by population history and local environments.
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