Establishment of a set of inbred strains of the pine wood nematode, Bursaphelenchus xylophilus (Aphelenchida: Aphelenchoididae), and evidence of their varying levels of virulence

Applied Entomology and Zoology - Tập 47 - Trang 341-350 - 2012
Ryoji Shinya1,2,3, Yuko Takeuchi1, Keita Ichimura1, Shuhei Takemoto4, Kazuyoshi Futai1
1Graduate School of Agriculture, Kyoto University, Kyoto, Japan
2Research Fellow of the Japan Society for the Promotion of Science, Tokyo, Japan
3Division of Biology California Institute of Technology, Pasadena, USA.
4Department of Forest Microbiology, Forestry and Forest Products Research Institute, Tsukuba, Japan

Tóm tắt

Pine wilt disease (PWD) caused by the pine wood nematode, Bursaphelenchus xylophilus (Steiner and Buhrer) Nickle, has become a worldwide problem. The pathogenic mechanism of PWD continues to remain controversial, which in part may be attributed to the lack of universal materials of B. xylophilus with a high genetic purity. The intrinsic high genetic diversity in B. xylophilus isolates/populations must be a fatal obstacle for performing forward genetics and other molecular approaches to controlling them. We conducted a series of successive full-sib mating of conventional isolates of B. xylophilus to establish a set of inbred strains. Using DNA markers, we also determined their genetic diversity and biological characteristics, such as virulence and reproductive ability. Consequently, the newly established strains yielded a higher genetic purity than the conventional isolates and showed varying virulence despite sharing a common ancestor. The significance of this study lies not only in establishing a set of inbred strains of B. xylophilus with the certification of their purity but also in demonstrating that avirulent strain(s) with a genotype similar to the virulent strains can be obtained by simple successive full-sib mating. This technique is one of the most powerful tools for elucidating the pathogenic mechanism(s) of PWD.

Tài liệu tham khảo

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