FACTORS OF DISEASE DEVELOPMENT CONTROL IN PINE WILT DISEASE

为阐明松材线虫病发病控制因素与寄主细胞生理状态之间的关系，研究了松材线虫与寄主细胞之间的反应。(1)松材枯萎病易感寄主的表面张力随病害的发展而降低。(2)松材线虫侵染后表面活性剂和草酸含量升高。这些物质在活松木中引起空化。(3)病害的发生与活木的乙烯产量密切相关。(4)空化现象的发生导致了活木含水率的降低。(5)抗光合作用导致的低聚糖减少与病害的发生密切相关。研究结果明确了松材萎蔫病发病过程中的黑箱现象与空洞现象的关系。

To elucidate the relationship between factors of disease development control and physiological status of host cells in the pine wilt disease, reactions between pine wood nematode and pine host cells were examined.(1) Susceptible hosts to pine wilt disease decrease their surface tension with the development of disease.(2) Surfactants and oxalic acid increase after infection of pine wood nematode.These substances induce cavitation in the living pine wood.(3) The disease development has a close relation with ethylene production in the living wood.(4) Incidence ofcavitation induces the decrease of wood moisture content in the living wood.(5) Decrease of oligosaccharide by antiphotosynthesis treatments is considered to have a close relationship with disease development.From the results, black boxes in disease development of pine wilt disease was made clear in connection with cavitaion.