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当前位置: 首页 > 文章 > 不同致病力线虫接种黑松后寄主体内组织病理学变化 南京林业大学学报(自然科学版) 2007,31 (4) 115-120
Position: Home > Articles > Histopathological Study on the Nematode in Seedling of Pinus thunbergii Journal of Nanjing Forestry University(Natural Sciences Edition) 2007,31 (4) 115-120

不同致病力线虫接种黑松后寄主体内组织病理学变化

作  者：
金钢;叶建仁
单  位：
南京林业大学森林资源与环境学院
关键词：
松材线虫;拟松材线虫;黑松;致病力;组织病理学;形成层;树脂道
摘  要：
分别用强、弱致病力松材线虫和无致病力拟松材线虫接种2年生黑松苗,发现不同致病力线虫在黑松苗体内的迁移特性不同,导致黑松苗产生的组织病理学变化也有差异。强致病力松材线虫扩散主要通过轴向树脂道在树体内上下扩散,通过径向树脂道在树体内向外扩散,并以此成为逾越形成层的通道,由于松属植物树脂道是遍布整个树体的一个"管网系统",所以线虫扩散速度快;弱致病力松材线虫扩散主要在皮层中,扩散速度慢,致病速度慢;无致病力拟松材线虫主要分布在皮层中,仅仅在少数皮层树脂道中发现线虫,而其对韧皮部、维管形成层细胞、木质部的射线细胞和树脂道周围的薄壁细胞未造成影响,也不能大量繁殖,因而对黑松不致病。无论是强致病力松材线虫还是弱致病力松材线虫接种后均未观察到线虫直接侵入松树形成层细胞,形成层细胞的死亡是一个渐进的过程,与线虫未到达的树脂道上皮细胞等薄壁细胞的死亡方式类似。
译  名：
Histopathological Study on the Nematode in Seedling of Pinus thunbergii
作  者：
JIN Gang, YE Jian-ren*(College of Forest Resources and Environment Nanjing Forestry University,Nanjing 210037, China)
关键词：
Bursaphelenchus xylophilus; B. mucronatus; Pinus thunbergii; Pathogenicity;Histopathology; Cambium; Resin canal
摘  要：
Two Bursaphelenchus xylophilus isolates (virulent and avirulent) and one B. mucronatus isolate were inoculated separately on 2-year-old seedlings of Pinus thunbergii. The results showed that behavior of nematode dispersal in seedlings caused by different isolates varied considerably, which caused in the development of histopathology within the host to be significantly different. The virulent isolate of B. xylophilus dispersed throughout the host via axial and radial resin duct. Nematodes had a great dispersal ability as the resin duct was a main lacunar system of pine. Population of arivulent isolate of B. xylophilus mainly dispersed into the cortical layer which led to a lower dispersal rate and killing power. Population of B. mucronatus was mainly distributed in the cortical layer and only on few occasions was detected in resin duct. They were nonpathogenicity to pine due to the low reproduction rate and no virulence to the cell lineages of phloem, vascular cambium, ray in xylem and parenchyma in resin passage. Results also indicated that no nematode dispersal was detected in cambium of pine regardless of the inoculated isolate which was virulent or avirulent. It suggested the cell death of cambium was a bionecrosis and the phenomenon was similar to that of parenchyma cells such as epithelial cell in resin passage, resulted indirectly from nematode dispersal.

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