摘要
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。
Studies by tissue clearing and Scanning Electron Microscope shows that Venturia nashicola Tanaka et Yamamoto can only parasitize epidermal cells and parenchymatous cells of leaf vein on pear leaves and the hyphae grow on the surface of the cells without invading into the cells. Results also demonstrate that the hyphae extended not only under the cuticular membrane but also on the intercellular space of epidermal cells and parenchymatous cells of leaf vein and finally formed a hyphal web around the cells. No metamorphic hyphae invaded into host cells, such as haustoria, were found in all the observations. The fungi did not parasitize mesophyll cells but caused some damage to them. The parasitic and pathogenic characteristics, which were different from the obligate parasitism and biocidal parasitism, prolonged the latent and conidial production period and were the key of recognizing the disease epidemic.
出处
《植物病理学报》
CAS
CSCD
北大核心
1999年第4期345-348,共4页
Acta Phytopathologica Sinica
基金
国家自然基金!资助号为39470475
