Influence of voltine ecotype and geographic distance on genetic and haplotype variation in the Asian corn borer |
| |
Authors: | Yangzhou Wang Kyung Seok Kim Qiyun Li Yunyue Zhang ZhenYing Wang Brad Steven Coates |
| |
Institution: | 1. Northeast Agricultural Research Center of China, Jilin Academy of Agricultural Sciences, Changchun China ; 2. Natural Resource Ecology and Management, Iowa State University, Ames IA, USA ; 3. Institute of Plant Protection, Chinese Academy of Agricultural Sciences, Beijing China ; 4. Corn Insects and Crop Genetics Research Unit, USDA ARS, Ames IA, USA |
| |
Abstract: | Diapause is an adaptive dormancy strategy by which arthropods endure extended periods of adverse climatic conditions. Seasonal variation in larval diapause initiation and duration in Ostrinia furnacalis may influence adult mating generation number (voltinism) across different local environments. The degree to which voltine ecotype, geographic distance, or other ecological factors influence O. furnacalis population genetic structure remains uncertain. Genetic differentiation was estimated between voltine ecotypes collected from 8 locations. Mitochondrial haplotypes were significantly different between historically allopatric univoltine and bivoltine locations, but confounded by a strong correlation with geographic distance. In contrast, single nucleotide polymorphism (SNP) genotypes show low but significant levels of variation and a lack of influence of geographic distance between allopatric voltine locations. Regardless, 11 of 257 SNP loci were predicted to be under selection, suggesting population genetic homogenization except at loci proximal to factors putatively under selection. These findings provide evidence of haplotype divergent voltine ecotypes that may be maintained in allopatric and sympatric areas despite relatively high rates of nuclear gene flow, yet influence of voltinism on maintenance of observed haplotype divergence remains unresolved. |
| |
Keywords: | divergent phenotypic selection ecological adaptation gene flow population genetics |
|
|