Phylogeny and population genetics of Bemisia tabaci (Hemiptera: Aleyrodidae) in Taiwan
Date Issued
2004
Date
2004
Author(s)
Hsien, Chia-Hung
DOI
zh-TW
Abstract
Bemisia tabaci is global distribution, the identification of character is based on the morphology of pupal case. However, this species is difficult to identify because the morphological characters could be polymorphic in different host plants. Recently, molecular markers are developed to study this species. The aim of this research was to study phylogeny, population genetics, and phylogeography by molecular markers. B. tabaci was collected from many regions in Taiwan, and three kinds of molecular markers were selected to analysis. Phylogenetic analyses of mitochondrial COI, 16S rDNA, and ribosomal ITS1 reveal three biotypes, B, AN, and Nauru biotypes in Taiwan. Genetic distance analysis reveals the relationship within populations of B biotype is closely related. On the contrary, genetic distance within populations of AN, and Nauru biotypes is more variable. The result could be speculated that B biotype moved into Taiwan recently. On the other hand, AN, and Nauru biotypes colonized into Taiwan naturally. AMOVA and FST analyses reveal that genetic variance between biotypes is significant. The population genetic studies of Nauru biotype reveal that gene flow is smooth between populations in the western Taiwan, and limited between the western, and eastern Taiwan. The result confirms to the theory of isolation by distance. Geographical region, and distance will limit the gene flow between populations, but gene flow between Matsu, and the eastern Taiwan populations don’t answer to the theory. Phylogeography analyses reveal that Nauru biotype colonized into Taiwan many times. The Nauru biotype colonized into Taiwan either by nature or international trade. However, phylogeographical studies of Nauru biotype still need more samples to be analyzed in the future.
Subjects
親緣地理學
族群遺傳
親緣關係
分子標示
煙草粉蝨
phylogeography
population genetics
phylogeny
molecular marker
Bemisia tabaci
Type
thesis
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