Delatte H, Holota H, Warren B H, Becker N, Thierry M, Reynaud B
CIRAD, UMR PVBMT, Pôle de Protection des Plantes chemin de l'IRAT, Saint Pierre, La Réunion, France.
Bull Entomol Res. 2011 Aug;101(4):487-97. doi: 10.1017/S0007485311000101. Epub 2011 Apr 15.
The whitefly Bemisia tabaci is a pest vector of begomoviruses on crops worldwide. Bemisia tabaci is composed of a complex of cryptic species which barely interbreed. An exception is the Ms from the South West Indian Ocean (SWIO), which crosses in low proportions with the exotic B. The Ms, together with B and Q is part of the same phylogenetic clad. To infer the genetic structure, the geographical range and putative origin of this putative species, microsatellite data and mitochondrial DNA (cytochrome oxydase I) sequences were analysed on an extensive sample set, including all the islands of the region and samples from mainland Africa. Only B and Ms populations were detected across these islands. The exotic B was found only on the islands of Réunion and Mauritius, whereas the Ms is found on all the SWIO islands. Very high isolation by distance was found for the Ms populations between islands of the SWIO, suggesting a long period of presence in this region. Ms populations from mainland Africa had a higher COI diversity than the Ms of the SWIO islands. This diversity is correlated with size and geological ages of the SWIO islands. The population genetic data obtained are in accordance with an origin of Ms in Africa, followed by its expansion and evolution across the SWIO islands prior to human arrival, confirming the status of Ms as indigenous in the SWIO islands.
烟粉虱Bemisia tabaci是全球农作物上双生病毒的害虫传播媒介。烟粉虱由一组几乎不杂交的隐性物种组成。来自西南印度洋（SWIO）的Ms是个例外，它与外来的B烟粉虱有低比例的杂交。Ms与B和Q属于同一系统发育分支。为了推断这个假定物种的遗传结构、地理范围和假定起源，我们对一个广泛的样本集进行了微卫星数据和线粒体DNA（细胞色素氧化酶I）序列分析，样本包括该地区的所有岛屿以及来自非洲大陆的样本。在这些岛屿上仅检测到B和Ms种群。外来的B烟粉虱仅在留尼汪岛和毛里求斯岛被发现，而Ms在西南印度洋的所有岛屿上均有发现。在西南印度洋各岛屿之间的Ms种群中发现了非常高的距离隔离现象，这表明该种群在该地区存在了很长时间。来自非洲大陆的Ms种群的细胞色素氧化酶I多样性高于西南印度洋岛屿上的Ms种群。这种多样性与西南印度洋岛屿的大小和地质年代相关。所获得的种群遗传数据与Ms起源于非洲，随后在人类到来之前在西南印度洋岛屿上扩张和进化的情况相符，证实了Ms在西南印度洋岛屿上的本土地位。
