Invasion Genetics of the Western Flower Thrips in China: Evidence for Genetic Bottleneck, Hybridization and Bridgehead EffectReportar como inadecuado




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The western flower thrips, Frankliniella occidentalis Pergande, is an invasive species and the most economically important pest within the insect order Thysanoptera. F. occidentalis, which is endemic to North America, was initially detected in Kunming in southwestern China in 2000 and since then it has rapidly invaded several other localities in China where it has greatly damaged greenhouse vegetables and ornamental crops. Controlling this invasive pest in China requires an understanding of its genetic makeup and migration patterns. Using the mitochondrial COI gene and 10 microsatellites, eight of which were newly isolated and are highly polymorphic, we investigated the genetic structure and the routes of range expansion of 14 F. occidentalis populations in China. Both the mitochondrial and microsatellite data revealed that the genetic diversity of F. occidentalis of the Chinese populations is lower than that in its native range. Two previously reported cryptic species or ecotypes were found in the study. The divergence in the mitochondrial COI of two Chinese cryptic species or ecotypes was about 3.3% but they cannot be distinguished by nuclear markers. Hybridization might produce such substantial mitochondrial-nuclear discordance. Furthermore, we found low genetic differentiation global FST = 0.043, P<0.001 among all the populations and strong evidence for gene flow, especially from the three southwestern populations Baoshan, Dali and Kunming to the other Chinese populations. The directional gene flow was further supported by the higher genetic diversity of these three southwestern populations. Thus, quarantine and management of F. occidentalis should focus on preventing it from spreading from the putative source populations to other parts of China.



Autor: Xian-Ming Yang, Jing-Tao Sun, Xiao-Feng Xue, Jin-Bo Li, Xiao-Yue Hong

Fuente: http://plos.srce.hr/



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