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采用电子显微镜技术对青杨叶锈病菌 (Melampsora larici- populina Kleb.)的侵染过程进行了研究。发现该菌夏孢子萌发产生 1～ 3个芽管 ,且具较多的树杈状分枝。芽管由气孔侵入 ,侵入前不形成明显的附着胞或仅个别芽管形成附着胞。芽管侵入气孔后在气孔腔内形成气孔下囊 ,再分化出圆形的膨大体而产生 1～ 2支初生菌丝。初生菌丝在寄主细胞间扩展 ,与叶肉细胞壁接触后分化出吸器母细胞 ,吸器母细胞中的细胞器与胞间菌丝相同 ,双核。吸器母细胞产生侵入钉侵入叶肉细胞内部形成吸器 ,成熟吸器由细长具颈环的管状颈部和膨大的吸器体组成 ,此时胞间菌丝在吸器母细胞处分化出次生菌丝 ,在叶肉细胞间扩展形成次生菌落 ,产生孢子堆。病菌在寄主细胞间隙或沿寄主细胞壁延伸时 ,寄主细胞仍保持正常状态。
The infection process of Melampsora larici-populina Kleb. Was studied by electron microscopy. Found that the bacteria uredospores germination 1 to 3 germ tube, and with more branches of the tree branches. Germ tube invasion by stomatal invasion before the formation of a significant attachment of cells or only a few bud tube formation of attachment cells. After the germ tube invades the stomatal cavity, the stomatal cavity is formed in the stomatal cavity, then the round swollen body is differentiated to produce 1 or 2 primary mycelium. Primary hyphae expanded between host cells, which contacted with the mesophyll cell wall to differentiate into the astrocytes. The organelles in the astrocytes were the same as the intercellular mycelium and binucleated. Inhalation of the astrocytes generated by the astrocytes of the astrocytes invades the mesophyll cells to form the aspirate. The ascending syringes consist of a tubular neck with an elongated neck and an enlarged body of the aspirate. At this time, the intersexit mycelia differentiate into secondary hyphae at the aspirate mother cells, The mesophyll cells expand to form secondary colonies, resulting in spores. The host cell remains in its normal state when the germ extends in the interstices of the host cell or along the host cell wall.