Physilological investigation on the susceptibilitiy of trees against infectioin with wilt diseases

2016 Fiscal Year Final Research Report

• Project/Area Number: 25292089
• Research Category: Grant-in-Aid for Scientific Research (B)
• Allocation Type: Partial Multi-year Fund
• Section: 一般
• Research Field: Forest science
• Research Institution: Kobe University
• Principal Investigator: Kuroda Keiko 神戸大学, (連合)農学研究科(研究院), 教授 (20353675)
• Co-Investigator(Kenkyū-buntansha): 石井 弘明 神戸大学, (連合)農学研究科(研究院), 准教授 (50346251)
• Research Collaborator: MORITA Takeshige 広島県立総合技術研究所, 農業技術センター果樹研究部, 研究員
• Project Period (FY): 2013-04-01 – 2017-03-31
• Keywords: ナラ枯れ / ブナ科樹木萎凋病 / イチジク株枯病 / 水ストレス / 通水阻害 / 木部樹液 / 土壌水分

Outline of Final Research Achievements

A certain percentage of trees survives after the infection with wilt diseases such as Japanese oak wilt caused by Raffaelea quercivora or fig wilt caused by Ceratocystis ficicola. We hypothesized that physiological stress of host trees and environmental condition may affect the mortality rate of infected trees because the rates fluctuate when a same strain of the pathogen is inoculated. By the comparison of aged oak trees with the similar numbers of Platypus quercivorus attack, survival rate of host trees were higher on the wet soil than on the dried soil of ridges. From the inoculation experiments of fig wilt, the enlargement of crosscut area of dysfunctional xylem was shown to be an important factor directly deciding the survival or mortality of the hosts. As indicators to predict the damages by wilt diseases, information of tree physiology and environment will be helpful.

Free Research Field

森林病理学および生理学