Q型烟粉虱东地中海种群遗传多样性的mtCOI与SSR分析

Genetic diversity analysis of the Q-biotype populations of Bemisia tabaci(Hemiptera:Aleyrodidae) from the Eastern Mediterranean regions using mtCOI and microsatellite markers

前期研究表明入侵我国山东的Q型烟粉虱Bemisia tabaci(Genn.)种群来源于西地中海地区而非来源于东地中海地区。为了揭示Q型烟粉虱的入侵遗传机制,本研究进一步利用线粒体COI(mtCOI)基因与6个具有多态性的微卫星位点(SSR)分析了东地中海Q型烟粉虱(Q1支系与Q2支系)种群的遗传多样性,并与西地中海种群遗传多样性的前期研究结果进行了比较分析。基于mtCOI基因与微卫星标记分析结果表明,东地中海种群与西地中海种群一样也具有较高的遗传多样性,然而两个地区种群存在着遗传异质性。不同入侵性种群遗传结构的比较研究将为进一步解析外来种群的入侵生理生态机制奠定基础。

Our earlier study showed that Bemisia tabaci biotype Q in Shandong, China, originated from the Western Mediterranean rather than the Eastern Mediterranean. To uncover the invasion mechanism of biotype Q, we analyzed the genetic diversity of the Q-biotype populations from the Eastern Mediterranean using the mtCOI gene and 6 highly polymorphic microsatellite loci, and compared the diversity to that of the Western Mediterranean Q-biotype populations. The results showed that the genetic diversity indices ofthe populations from this region were as high as those from the Western Mediterranean, ann did not exhibit a significant difference. However, genetic heterogeneity existed within the populations in the two regions. The comparison of the genetic structure of populations, in native ranges and with different invasiveness, will be helpful to further reveal the physiological and ecological mechanisms of the invading alien populations.