Fourth International Bemisia Workshop International Whitefly Genomics Workshop
Population genetics of Bemisia tabaci Biotypes B and Q from the Mediterranean and the U.S. inferred using microsatellite markers
1 Subtropical Insects Research Unit, U. S. Horticultural Research Laboratory, ARS, USDA, Fort Pierce, FL, USA. Correspondence: rshatters@ushrl.ars.usda.gov
2 Biology Department, University of St. Thomas, Houston, TX, USA
Bemisia tabaci is composed of several biotypes, some of which appear to have pre and/or post zygotic barriers to hybridization. Numerous studies have been performed to determine the geographical distribution of different biotypes, but little is know about the gene flow within and among biotypes. Recent research on microsatellite markers associated with different biotypes in Australia and South East Asia indicates limited gene flow among populations. Using the same microsatellite markers, we evaluated gene flow among and within B and Q biotype populations in the Mediterranean region and in the United States. Our data indicate that despite the recent invasion of the Q biotype into the U.S., it has much greater genetic diversity than the B biotype B. tabaci. Furthermore, Structure analysis of the Biotype Q microsatellite data indicates that movement of the Q biotype into the U.S. is the result of more than a single introduction. Observed differences in specific markers among the B and Q biotypes does not support recent gene flow between these two biotypes. This data corroborates the mitochondrial COI sequence comparisons performed from populations throughout the U.S.
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