Estimation of the genetic resources and geographical variation of Japanese pine to pine wilt disease

为了开发抗松材线虫病的松树，我们试图弄清九州地区松树对松材线虫病的抗性差异以及该地区松材线虫致病力的多样性。经接种试验，采集自九州地区的松苗平均成活率在16%左右(8%~36%)。不同地区的存活率不同。结果显示出了与过去类似的趋势。这一结果表明，不同地区的松林对该病的抗性不同。抗性较强的松苗在致病力较强的松材线虫菌株中的存活率较高。这一结果表明，利用高抗病品种的苗木可以减少松材线虫病的危害。

For developing the resistant pines to pine wilt disease, we have attempted to clarify the difference between the resistance to the pine wilt disease of pine in Kyushu region as well as the diversity of virulence of the pine wood nematode of that region. After inoculation tests, the average survival rate of pine seedlings collected from Kyushu region were around 16%(8 to 36%). The survival rate was different depending on the region. And the results showed a similar trend of the past. This result was suggested that the resistance ability of pine to that disease was different by the regional pine forest. The pine seedlings derived from higher resistant ability had a higher survival rates in the pine wood nematode strains with relatively strong virulence. This result suggested that using seedlings derived from high resistance varieties reduce the damage of pine wilt disease.