マツノザイセンチュウ被害による傷害樹脂道の発生と柔細胞の変性

概要

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Some anatomical changes of the stem wood of 4-year-old seedlings of Kuromatsu, Japanese black pine (Pinus thunbergii PARL.) in relationship to the disease developments after inoculation with pine wood nematodes (Bursaphelenchus lignicolus MAMIYA et KIYOHARA) were examined. A reduction of oleoresin exudation was observed from the 7th day, and a discoloration of leaves began from about the 21st day after inoculation. Anatomical observations revealed that cytological changes of the parenchyma cells (ray and surrounding parenchyma cells), characterized by a staining of the cell contents, appeared on the 4th day after inoculation, before the reduction of oleoresin exudation. As these cytological changes proceeded, epithelial cells, which remained unstained, became flat and then were destroyed. Traumatic resin canals, at an early stage in the disease's development, were observed on the 16th day after inoculation. This shows that pines attacked by the nematodes start the formation of traumatic resin canals early as a response to some stimulation in the cambial zone. The formation of traumatic resin canals also was found in two 35-year-old Japanese black pine trees which were affected naturally by the disease. In seedlings which once were affected but later recovered, some traces of cytological changes of the parenchyma cells and the formation of traumatic resin canals also were observed.
一般社団法人日本森林学会の論文
1982-03-25