摘要
Soft rot caused by Rhizopus oryzae occurred on unshiu orange (Citrus unshiu Marc.) sampled from commercial markets in Jinju, Korea, 2010. The first symptom of soft rot on orange is a water-soaked appearance of the affected tissue. The infected parts later disintegrated into a mushy mass of disorganized cells followed by rapid softening of the diseased tissue. The lesion on orange was rapidly softened and rotted, then became brown or dark brown. Optimum temperature for mycelial growth of the causal fungus on potato dextrose agar was $30^{\circ}C$ and growth was still apparent at $37^{\circ}C$. Sporangiophores were $6{\sim}20\;{\mu}m$ in diameter. Sporangia were globose and $40{\sim}200\;{\mu}m$ in size. The color of sporangia was brownish-grey to blackish-grey at maturity. Sporangiospores were sub-globose, brownish- black streaked and $4{\sim}10\;{\mu}m$ in size. Columella were globose to sub-globose and $85{\sim}120\;{\mu}m$ in size. On the basis of mycological characteristics, pathogenicity test, and the ITS sequence analysis, the causal fungus was identified as Rhizopus oryzae. To our knowledge, this is the first report of soft rot caused by R. oryzae on unshiu orange in Korea.
摘要译文
造成的米根霉软腐病发生在温州蜜柑橙色（温州蜜柑）从晋州，韩国2010年商业市场采样。橙色软腐病的第一个症状是一种水浸泡的外观受影响的组织。受感染的部位后解体成无序细胞随后患病组织的迅速软化的糊状物质。橙色病变迅速软化，腐烂，然后变成褐色或黑褐色。最适温度为因果真菌在马铃薯葡萄糖琼脂菌丝生长30元^ {\\保监会} C $和增长仍然明显约为370 ^ {\\保监会} C $。孢囊柄是6美元{\\ SIM} 20 \\ {\\}万亩直径M $。孢子囊为球形及四十元{\\ SIM} 200 \\ {\\}亩大小M $。孢子囊的颜色是棕灰色至灰黑色的成熟。孢囊孢子是分球形，brownish-黑色条纹美元和4 {\\ SIM} 10 \\ {\\}亩大小M $。鼻小柱是球形至亚球形和85美元{\\ SIM} 120 \\;大小{\\亩} M $。对真菌的特性，致病性试验的基础上，与ITS序列分析，因果木耳被认定为米根霉。据我们所知，这是温州蜜柑橙在韩国引起水稻根瘤菌软腐病的第一份报告。
Kwon, Jin-Hyeuk ; Kim, Jin-Woo ; Hyun, Jae-Wook ; Lee, Yong-Hwan ; Shim, Hong-Sik. Soft Rot on Citrus unshiu Caused by Rhizopus oryzae in Korea[J]. Research in Plant Disease, 2011,17(1): 78-