Haplotype analysis of Bemisia tabaci biotype Q in Jiangsu Province, China.
In order to clarify the genetic diversity and invasion source of Bemisia tabaci biotype Q in Jiangsu Province, B. tabaci biotype Q was collected from 13 geographic populations in Jiangsu Province in 2010 and 2011, and the haplotypes of individuals were analyzed by using mtDNA COI gene sequences. The results showed that Q1, Q2, Q3 and Q4 haplotypes were detected, and different haplotypes had different distributions and frequencies. Q2 haplotype existed in all the geographic populations, and the occurrence frequency was more than 50% in the two years; Q1 and Q3 haplotypes were less widely distributed and shared in some populations; Q4 had the lowest frequency and was only detected in Yangzhou population. Q1 haplotype showed close genetic relationship with Q3, and Q2 haplotype had close genetic relationship with Q4. The different geographic populations had genetic exchanges and genetic differentiations. The phylogenetic tree showed that B. tabaci biotype Q in Jiangsu Province was genetically similar to those from western Mediterranean countries, and biotype Q populations in Jiangsu probably originated from western Mediterranean region and shared the same invasion source with the population from Japan.