纵坑切梢小蠹蓝污真菌侵害云南松树组织解剖观察

通过对云南松树进行纵坑切梢小蠹（Tomicus piniperda）蓝污真菌（Leptogramphium yunnanense）接种试验，对云南松受害组织进行了形态解剖观察，验证了蓝污真菌对云南松的致病作用。蓝污真菌发现于受害木质部和韧皮组织中的各类细胞中，在木质部，蓝污区域呈现出以心材为中心的扇形分布。在韧皮组织内，蓝污真菌主要沿着细胞轴向在垂直方向上生长，并可通过孔纹进入到水平方向上的相邻细胞内。本项研究揭示了该蓝污真菌在云南松树干韧皮和木质部组织，细胞内的生长和蔓延规律，进一步表明纵坑切梢小蠹蓝污真菌L.yunnanense是云南松的一种病原真菌。

THE HISTOLOGICAL OBSERVATIONS ON INVASION OF BLUE-STAIN FUNGI (LEPTOGRAMPHIUM YUNNANENSE) ASSOCIATED WITH TOMICUS PINIPERDA ON PINUS YUNNANENSIS

The present study, based on the results of inoculation of Leptogramphium yunnanense associated with Tomicus piniperda on Pinus yunnanensis trees, made histological observations on the pine tree tissue infected by the fungi. The study demonstrated the pathogenic function of the fungi. The fungi were found in various types of the cells of the infested phloem and sapwood. In wood section the blue stained area appeared in the sapwood as the fan around the heartwood. Inside phloem tissue, the fungi mostly extended along various cell axes in vertical, and horizontally entered the adjacent cells through cell pets. The rule of the fungi distribution and growth inside the phloem and sapwood of the host trees were illuminated in this paper, and it so further proved that L. yunnanense is one type of pathogenicity fungi on Yunnan pine trees at some degrees.