金针菇担孢子核相及遗传属性的研究

Studies on nuclear phase and genetic attribute of the basidiospores of Flammulina velutipes

以3个不同的金针菇菌株为材料,研究了其担孢子的核相及遗传属性。荧光染色观察显示,担孢子核相以双核为主,双核孢子、单核孢子和无核孢子分别占80.2%、7.5%和12.3%。源于单孢分离物的菌丝为有隔膜、无锁状联合的多核菌丝。在交配试验中,源于不同菌株单孢分离物的菌丝原生质体的配对形成具锁状联合的菌落,而源于同一单孢分离物的菌丝原生质体的配对则形成无锁状联合的菌落,暗示担孢子中的两个核具有相同的交配型。RAPD分析显示,源于同一单孢分离物的菌丝原生质体为10个随机引物所扩增的图谱彼此完全相同,印证了担孢子中的双核是同质的。此外,观察表明,一个担子上着生有4个担孢子。因此,金针菇是一种具4个含同质双核担孢子的四极性蕈菌。

Nuclear phase and genetic attribute of the basidiospores were investigated for 3 strains of Flammulina velutipes. Fluorescence staining observation displayed that the majority of basidiospores were dikaryotic and the ratio of dikaryotic spores, monokaryotic ones and nuclear-free ones was 80.2%, 7.5% and 12.3% respectively. The mycelia derived from single spore isolates were confirmed as polykaryotic septate ones without clamp connection. In the mating test, mycelial protoplast pairs between single spore isolates of different strains formed colonies with clamp connection, while mycelial protoplast pairs between the same single spore isolates formed colonies without clamp connection, suggesting that the two nuclei of the spores possessed identical mating type factors. RAPD analysis indicated that the profiles of mycelial protoplasts obtained from same single spore isolates amplified by 10 random primers were entirely identical, corroborating that the two nuclei of a basidiospore were homogeneous. In addition, it is observed that there are 4 basidiospores growing on a basidium. Consequently, F. velutipes is a tetrapolar fungus possessing 4 basidiospores where there are two homogeneous nuclei.