扁绒泡菌的生活史

Life cycle of Physarum compressum

黏菌的生活史对于研究其营养方式的多样性以及系统发育等具有重要价值,目前国内外有关黏菌生活史的报导很少。利用燕麦-琼脂培养、基物培养及扫描电镜技术研究了扁绒泡菌的个体发育过程,在燕麦琼脂培养基上完成了从孢子到孢子的生活史。结果表明,扁绒泡菌生活史包括单核的黏变形体或游动胞、多核的营养体原质团以及孢子形成阶段。孢子球形,表面具细小疣点。孢子萌发为裂式,释放1黏变形体。原质团类型为显型。成熟原质团乳白色,可形成多个孢囊。琼脂培养基上获得的扁绒泡菌孢子与野生型相似,并具有可育性。

The life history of myxomycetes is of importance for studying diversity of nutritive modes and phylogenesis of these organisms. Until now the reports concerned were few. Oat-agar culture method, moist chamber culture method and scanning electron microscopy were used to study the process of the ontogeny of Physarum compressum： The life cycle of spore-to-spore were completed in agar culture in Petri dish. The result shows that the life cycle of Physarum compressum comprises a unicellular amoeboid or swarm cell stage, a multinucleate plasmodium stage and a sporulation stage. The spore is globose and the spore surface is minutely spiny. The spore germinates by means of a cracked open and releases a single myxamoeba. The plasmodial type is of phaneroplasmodium. The mature plasmodium is milk-white, which can form many sprangia. Spores developed on agar are fertile and resemble those on natural substrate.