摘要
In the present study, genetic differentiation of Bemisia tabaci （Gennadius） biotype Q was analyzed based on mitochondrial cytochrome oxidase I （mt CO1） gene sequence. The results showed that B. tabaci biotype Q could be separated into two subclades, which were labeled as subclades Q1 and Q2. Subclade Q1 was probably indigenous to the regions around the Mediterranean area and subclade Q2 to Israel or Cyprus. It was because B. tabaci was composed of several genetically distinct groups with a strong geographical association between more closely related biotypes. Not all of the B. tabaci biotype Q in the non-Mediterranean countries come from the same regions. Until now, all B. tabaci biotype Q in China were grouped into subclade Q 1. The B. tabaci biotype Q introduced into the US included both subclades Q 1 and Q2. The genetic structure analysis showed higher genetic variation of subclade Q 1 than that of subclade Q2.
In the present study, genetic differentiation of Bemisia tabaci （Gennadius） biotype Q was analyzed based on mitochondrial cytochrome oxidase I （mt CO1） gene sequence. The results showed that B. tabaci biotype Q could be separated into two subclades, which were labeled as subclades Q1 and Q2. Subclade Q1 was probably indigenous to the regions around the Mediterranean area and subclade Q2 to Israel or Cyprus. It was because B. tabaci was composed of several genetically distinct groups with a strong geographical association between more closely related biotypes. Not all of the B. tabaci biotype Q in the non-Mediterranean countries come from the same regions. Until now, all B. tabaci biotype Q in China were grouped into subclade Q 1. The B. tabaci biotype Q introduced into the US included both subclades Q 1 and Q2. The genetic structure analysis showed higher genetic variation of subclade Q 1 than that of subclade Q2.
基金
We would like to acknowledge Dr. Ian Denholm （Rothamsted Experimental Station） for providing whitefly samples for the experiments. We thank Prof. Dr. Imtiaz Ali Khan, Chairman, Department of Entomology, NWFP Agricultural University Peshawar, NWFP, Pakistan, for reviewing and editing the original manuscript. This work was funded by Key Project of Chinese National Programs for Fundamental Research and Development （2002CB 111400）, National Natural Science Foundation of China （Grant No. 30500331
No.30771410）, Innovation Foundation of Shandong Academy of Agricultural Sci- ences （No. 2007YCX030
No. Q2006B05）, and Key Projects in the National Science ＆ Technology Pillar Program in the Eleventh Five-year Plan Period （2006BAD08A18）.
