厚朴苗根腐病的研究 Ⅰ.病原菌鉴定

Studies on the Seedling Root of Magnolia Biloba in Fujian Province

从本省浦城、明溪二个厚朴主产区采集的厚朴苗根腐病标本中,分离接种得到4个致病菌株,它们具有不同程度的致病力。4个菌株通过PSA、麦粒、米饭培养基等培养性状观察、孢子形态及孢子形成方式镜检,结果显示它们的菌落生长速度、颜色、质地;大、小型分生孢子与厚垣孢子的形态、大小及孢子形成方式等基本相似,均鉴定为镰孢属(Fusarium Link ex Fr.)美丽组(Section ElegansWr.)的尖镰孢菌(Fusarium oxysporum Schlecht)

The Fusarium root rot of Magnolia biloba seriously occurred in Pu-Cheng and Mingxi Counties of Fujian province. All virulent isolated from diseased roots collected from these regions were identified as Fusarium oxysporum Schlecht. The fungus in culture produced abundance of microconidia wemestly nonseptate , ovoid to ellipsoid, and measuring 5.11-9.15×4.24μm. Macr,oconidia were usually sickle, slighly curved in shape, pointed at both ends, typically 3 septate, measuring 27.2-45.0×3.0-4.9μm. Chlamydospores were produced in abundance, borne terminally or intercalarily, spherical in shape with 6.19-10.1μm in diameter.