伏田生态型和地理距离对亚洲玉米螟遗传和单倍型变异的影响,Ecology and Evolution

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伏田生态型和地理距离对亚洲玉米螟遗传和单倍型变异的影响
Ecology and Evolution ( IF 2.6 ) Pub Date : 2021-07-09 , DOI: 10.1002/ece3.7829
Yangzhou Wang ₁ , Kyung Seok Kim ₂ , Qiyun Li ₁ , Yunyue Zhang ₁ , Zhen-Ying Wang ₃ , Brad Steven Coates ₄

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滞育是一种适应性休眠策略，节肢动物通过这种策略来忍受长时间的不利气候条件。亚洲玉米螟幼虫滞育起始和持续时间的季节性变化可能会影响不同当地环境中的成虫交配代数（voltinism）。伏田生态型、地理距离或其他生态因素对亚洲玉米螟种群遗传结构的影响程度仍不确定。对从 8 个地点收集的 voltine 生态型之间的遗传分化进行了评估。历史上异域单化和二化位置之间的线粒体单倍型存在显着差异，但与地理距离的强相关性令人困惑。相比之下，单核苷酸多态性 (SNP) 基因型显示出较低但显着的变异水平，并且不受异域 voltine 位置之间地理距离的影响。无论如何，257 个 SNP 位点中的 11 个被预测为处于选择之下，这表明除了接近推定处于选择因素的基因座之外，群体遗传同质化。这些发现提供了单倍型趋异的伏汀生态型的证据，尽管核基因流率相对较高，但伏汀主义对维持观察到的单倍型趋异的影响仍未解决。

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Influence of voltine ecotype and geographic distance on genetic and haplotype variation in the Asian corn borer

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.

更新日期：2021-08-03

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