Sun Jing-Tao, Wang Man-Man, Zhang Yan-Kai, Chapuis Marie-Pierre, Jiang Xin-Yu, Hu Gao, Yang Xian-Ming, Ge Cheng, Xue Xiao-Feng, Hong Xiao-Yue
Department of Entomology, Nanjing Agricultural University, Nanjing, Jiangsu 210095, China.
CIRAD, UMR CBGP, F-34398 Montpellier, France.
Sci Rep. 2015 Jan 27;5:8045. doi: 10.1038/srep08045.
Understanding dispersal ability in pest species is critical for both theoretical aspects of evolutionary and population biology and from a practical standpoint, such as implementing effective forecasting systems. The small brown planthopper (SBPH), Laodelphax striatellus (Fallén), is an economically important pest, but few data exist on its dispersal ability. Here, we used mitochondrial and nuclear markers to elucidate the population genetic structure of SBPH and of the parasitic bacterium Wolbachia throughout temperate and subtropical China. Our results showed that the SBPH populations in China lack significant differences in genetic structure, suggesting extensive gene flow. Multilocus sequence typing revealed that Wolbachia infection was systematic and due to the same strain (wStri) within and across populations. However, the mtDNA haplogroups had a nonrandom distribution across the sampling localities, which correlated to latitudinal and climatic gradients. We explain this mito-nuclear discordance as a result of historical population recolonization or mitochondria adaptation to climate.
了解害虫的扩散能力对于进化生物学和种群生物学的理论研究以及从实际应用角度（如实施有效的预测系统）而言都至关重要。灰飞虱（Laodelphax striatellus (Fallén)）是一种具有重要经济意义的害虫，但关于其扩散能力的数据却很少。在此，我们利用线粒体和核标记来阐明中国温带和亚热带地区灰飞虱及其寄生细菌沃尔巴克氏体的种群遗传结构。我们的结果表明，中国的灰飞虱种群在遗传结构上缺乏显著差异，这表明存在广泛的基因流动。多位点序列分型显示，沃尔巴克氏体感染具有系统性，且种群内部和种群之间均由同一菌株（wStri）引起。然而，线粒体DNA单倍型类群在采样地点间呈现非随机分布，这与纬度和气候梯度相关。我们将这种线粒体 - 核不一致现象解释为历史种群重新定殖或线粒体适应气候的结果。
