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组织透明及扫描电镜研究结果表明:梨黑星病菌在叶片上主要寄生于表皮细胞和叶脉薄壁组织细胞的表面,沿细胞表面扩展。病原菌并非只在角质层与表皮细胞间生长,而且在表皮细胞和叶脉薄壁组织细胞的细胞间寄生。在大量的观察中,没有发现侵入到细胞内菌丝或菌丝变态结构。梨黑星病菌不寄生叶肉细胞,但能导致叶肉细胞病变。由于黑星病菌的寄生性既不同于专性寄生,也不同于杀生寄生,才使梨黑星病的潜育期和产孢期都长于这两类真菌病害。这是认识和研究梨黑星病发病特点和流行规律的基础。
Tissue transparency and scanning electron microscopy results showed that: pear pear starches mainly in the leaves of epidermal cells and parenchyma cells parenchyma cells along the cell surface expansion. Pathogens do not only grow between the stratum corneum and epidermal cells, but also parasitize cells in the epidermal cells and the parenchyma of the veins. In a large number of observations, no invaded intracellular mycelium or mycelium metamorphosis was found. Pythium pear non-parasitic mesophyll cells, but can lead to mesophyll cell disease. Due to the parasitic nature of the black star bacteria is different from the obligate parasitic, but also different from the parasitic parasitic, pear scab so that the incubation period and sporulation period are longer than these two types of fungal diseases. This is the basis for understanding and studying the characteristics and prevailing laws of pear scab.