Effects of rapid increase in host resistance on pine wilt disease epidemics

2014 Fiscal Year Final Research Report

• Project/Area Number: 22380081
• Research Category: Grant-in-Aid for Scientific Research (B)
• Allocation Type: Single-year Grants
• Section: 一般
• Research Field: Forest science
• Research Institution: The University of Tokyo
• Principal Investigator: TOGASHI Katsumi 東京大学, 農学生命科学研究科, 教授 (30237060)
• Co-Investigator(Kenkyū-buntansha): MATSUNAGA Koji 独立行政法人森林総合研究所, 林木育種センター, 主任研究員 (40415039) ; SUGIMOTO Hiroyuki 山口県農林総合技術センター, 林業技術部, 専門研究員 (00522244)
• Research Collaborator: LIAO Si-Mi ; KASUGA Hayami ; JIKUMARU Shota ; IGUCHI Kazunobu
• Project Period (FY): 2010-04-01 – 2015-03-31
• Keywords: 林学 / マツノザイセンチュウ / 抵抗性 / 毒性 / 媒介昆虫 / ニセマツノザイセンチュウ / マツノマダラカミキリ / スクリーントラップ

Outline of Final Research Achievements

Pine wilt is the disease caused by the pinewood nematode, which is vectored by the insect, Monochamus alternatus. When different numbers of nematodes of a virulent isolate were inoculated on open-pollinated seedlings of resistant pine trees, logistic regression on the seedling mortality showed that inoculating a given number of nematodes could evaluate the resistance level of mother trees. Hybrids of pathogenic and non-pathogenic nematode species showed that nuclear genes were related to boarding of nematodes on beetle bodies. Two nematode populations that shared genetic background but had different virulent expressions indicated a positive correlation between the virulence and transmission. Taiwanese vector showed that the probability of inducing diapause increased as the environmental conditions were getting worse. Simulation model indicated that spatial distribution pattern of different resistant pine trees affected the stand resistance against the disease epidemic.

Free Research Field

森林動物学