Kwon Jin-Hyeuk, Lee Chan-Jung
Gyeongsangnam-do Agricultural Research and Extension Services, Jinju 660-360, Korea.
Mycobiology. 2006 Sep;34(3):151-3. doi: 10.4489/MYCO.2006.34.3.151. Epub 2006 Sep 30.
Rhizopus soft rot caused by Rhizopus stolonifer occurred on pears (Pyrus serotina) in the Jinju City Agricultural Products Wholesale Market in Korea from 2004 to 2005. The infection usually started from wounds due to cracking at harvest time. The lesions started as water-soaked, rapidly softened, then gradually expanded. The mycelia grew vigorously on the surface of the fruits and formed stolons. Colonies on potato dextrose agar at 25℃ were white cottony to brownish black. Sporangia were globose, black and 90120 µm in size. Sporangiophores were light brown and 4802600 × 1218 µm in size. Sporangiospores were globose to oval, brownish, streaked, and 814 × 610 µm in size. Columella were light brownish gray, hemispherical and 7080 µm in size. On the basis of these symptoms, mycological characteristics and pathogenicity tests on host plants, the fungus was identified as Rhizopus stolonifer (Ehrenb.) Vuill. This is the first report of rhizopus soft rot on pear (P. serotina) caused by R. stolonifer in Korea.
2004年至2005年期间，韩国晋州市农产品批发市场的梨（秋子梨）上发生了由匍枝根霉引起的根霉软腐病。感染通常从收获时因果实开裂造成的伤口开始。病斑起初呈水渍状，迅速变软，然后逐渐扩大。菌丝体在果实表面旺盛生长并形成匍匐枝。在25℃下，该菌落在马铃薯葡萄糖琼脂培养基上呈白色棉絮状至棕黑色。孢子囊呈球形，黑色，大小为90120 µm。孢囊梗浅褐色，大小为4802600×1218 µm。孢囊孢子呈球形至椭圆形，褐色，有条纹，大小为814×610 µm。囊轴浅褐灰色，半球形，大小为7080 µm。根据这些症状、真菌学特征以及对寄主植物的致病性测试，该真菌被鉴定为匍枝根霉（Ehrenb.）Vuill。这是韩国首次报道由匍枝根霉引起的梨（秋子梨）根霉软腐病。
