Effects of interspecific hybridization and number of vector insect species on invasion and genetic structure of entomophilic nematodes

入侵线虫与本土线虫的种间杂交结果表明，木蠹蛾的基因已渗入到木蠹蛾的基因组中，而致病和登虫能力的基因位于木蠹蛾的核基因组上。在自然增殖率和登代能力方面，杂种群体与单亲本或双亲本群体之间没有显著差异，表明这种杂种群体能够在田间持续生存。现场调查和DNA分析表明，这两个陶粒类媒介生物并没有将松毛虫种群划分为两个遗传上不同的亚种群。

Interspecific hybridization between the invasive nematode pest Bursaphelenchus xylophilus and its closely-related, native nematode B. mucronatus showed that B. mucronatus genes introgressed into B. xylophilus genome and that genes responsible for the pathogenicity and ability to board insect vectors were on the nuclear genome. There were no significant difference in the intrinsic rate of natural increase or boarding ability between some hybrid-derived populations and one or two parent populations, suggesting that such hybrid-derived populations were able to persist in the field. Field survey and DNA analysis showed that the two cerambycid species of vectors did not separate Bursaphelenchus conicaudatus populations into two genetically different subpopulations.